Camlock Fittings Guide: Types A–F, Materials, Pressure & Selection

Camlock fittings are the universal quick-connect coupling system used across Australian industry for transferring water, fuel, lubricants, chemicals, slurry, dry powders and food-grade liquids through flexible hose. Two cam arms snap closed over the male adapter's groove, and you have a leak-tight connection in seconds — no threads to engage, no spanners required.

The design has been an industrial standard since the 1940s. It originated as the US military specification MIL-C-27487 (now superseded by A-A-59326) and was standardised in Europe as EN 14420-7. Across both standards, the cam-and-groove geometry is dimensionally interchangeable — a Type A from one manufacturer mates with a Type D from another, regardless of country of origin.

This guide covers the universal Type A–F system, material selection, gasket compatibility, pressure ratings (the most misunderstood spec), fuel-transfer grounding requirements, food and beverage sanitary applications, mining and slurry service, and the difference between industrial-grade camlocks and cheap consumer-tier imports. It scopes the AIMS commercial range — 99 camlock fittings in stock across two complementary brands: AAP (our Australian house brand covering the workshop volume tier in aluminium, polypropylene, nyglass and stainless steel) and Dixon (the global premium specialty range including Boss-Lock self-locking arms, Scroll Tail factory-ferruled couplers, conductive aluminium for fuel grounding, bronze marine, API tanker adaptors and dry-powder fluidizer fittings).

What this guide is NOT: a hydraulic fittings reference (see our Hydraulic Fittings Guide for BSP/JIC/ORFS high-pressure systems), a pneumatic air-line reference (see our Pneumatic Fittings & Air Line Guide), a brewery vessel Tri-Clamp reference (different sanitary system), or a firefighting Storz coupling reference (different product class entirely — see the disambiguation H2 below).

Which types mate with which — Quick Reference

The cam interface is universal but mating is constrained by the gender of each end. A male adapter (A, E, F) mates with a female coupler (B, C, D).

What is a camlock fitting?

A camlock fitting — also called a cam-and-groove coupling, cam lock fitting, or (when made by Dixon) a Kamlok — is a two-part quick-connect hose coupling. The female half (the "coupler") has two cam arms that pivot on pins. The male half (the "adapter") has a precisely-machined groove around its circumference and a gasket-seating face at its end.

To connect: insert the male adapter into the female coupler against the gasket, then push both cam arms down simultaneously. The cam arms rotate and their inner profile catches the male adapter's groove, pulling the two halves together and compressing the gasket. To disconnect: lift both arms back to vertical. The whole operation takes about three seconds and requires no tools.

The genius of the design — and the reason it's an industrial standard worldwide — is that the cam-and-groove interface is identical across manufacturers and countries. A Type A male adapter manufactured by Dixon in the US, AAP in Australia, or a European supplier to EN 14420-7 will all mate with a Type C, D or DC female coupler from any other manufacturer. The standards (A-A-59326 and EN 14420-7) lock the dimensions tightly enough that interchangeability is genuine, not theoretical.

Camlocks are for temporary or semi-frequent connections at moderate pressures. They're the right answer for transfer hoses, drum-to-tank fuel decanting, slurry transfer, IBC bottom outlets, irrigation main connections, brewery wort transfer, and washdown hose connections. They're the wrong answer for permanent pipeline service, hydraulic systems above 250 psi, or installations where vibration can knock cam arms loose without warning.

The Type A–F system decoded

Every camlock fitting falls into one of eight type categories. The type letter identifies what's on the non-cam end of the fitting — male thread, female thread, hose tail, or dust cover. The cam interface itself is universal: any "male" fitting (A, E, F) mates with any "female" fitting (B, C, D, DC) of the same bore size.

The naming is non-intuitive — most first-time buyers reverse Type A and Type B in their heads. The reliable mnemonic from tradespeople who use these every day: "A and E both have a male cam end; A is female-threaded, E is hose-tailed." Once you fix Types A and E in your head, the rest follow.

AIMS stocks the full Type A–F + DC + DP range across all four AAP materials. Direct product links for the most-ordered types: Type A Aluminium, Type B Aluminium, Type C Aluminium, Type D Aluminium, Type E Aluminium, Type F Aluminium, plus dust covers Type DC and Type DP.

Which types mate with which

The cam interface is universal but mating is constrained by the gender of each end. A male adapter (A, E, F) mates with a female coupler (B, C, D). Dust caps (DC) fit OVER male adapters; dust plugs (DP) fit INTO female couplers.

The most-ordered combinations in industrial fluid transfer:

• A + C — pump outlet (male threaded) to flexible hose. The workhorse pairing.
• D + E — tank or vessel outlet (male threaded pipe) to flexible hose.
• B + C — threaded equipment port (female threaded) to hose. Less common than A+C.
• E + C — hose-to-hose joining. Two hoses meet via a Type E coupled into a Type C.
• F + D — both ends threaded — rare, used in specialty pipework where a cam disconnect is needed mid-line.

Sizing — it's the bore, not the thread

Camlock size refers to the internal bore diameter — the same as the hose internal diameter (ID) it's designed to connect to. A 2" camlock has a 2" bore. The thread size on a Type A/B/D/F fitting is independent of the bore size — typically matched but can vary.

Australian and New Zealand markets size camlocks in imperial bore (the international convention) even though Bunnings often labels them in metric. A 50mm camlock is a 2" camlock. A 25mm camlock is a 1" camlock. The two are interchangeable terminology for the same fitting.

Thread standards — BSP vs NPT in Australia

For any threaded camlock type (A, B, D, F), the thread can be either BSP (British Standard Pipe — the Australian and European standard) or NPT (National Pipe Tapered — the US and Canadian standard). The two are NOT interchangeable. A BSP thread will not mate properly with NPT — they'll start threading but jam, cross-thread, or leak.

For Australian-built equipment (pumps, IBCs, tanks, valves), specify BSP camlocks. Most AAP and Dixon Australia stock is BSP standard.

For US-imported equipment (Honda diesel pumps, American IBCs, US-spec compressors), specify NPT camlocks. AIMS stocks both standards — the product title clearly identifies BSP or NPT.

BSP itself has two sub-types: BSPP (parallel) and BSPT (tapered). Most camlock threads are BSP parallel — they seal at the gasket face, not at the thread. For threaded connections that need to seal at the thread itself (high-pressure or gas service), BSPT is required — but camlocks aren't used for those applications anyway.

Material selection — aluminium, brass, stainless, polypropylene

Camlock body material is the second-biggest selection decision after type. The wrong material in the wrong service is the leading cause of premature fitting failure.

AAP covers four of these materials at workshop tier — aluminium, polypropylene, nyglass, and stainless steel. Dixon extends the range with brass, bronze sand-cast, and 316 SS premium investment-cast for sanitary service. Ductile iron is sourced on request for heavy mining specifications — contact us with your slurry composition and flow requirements.

Gasket selection — match to media, not body

Camlock gaskets sit at the male adapter's seating face and compress when the cam arms close. The gasket — not the metal — does the sealing work. The single most common camlock failure trace is gasket-to-media mismatch: a buyer specs the body in stainless for chemical resistance, then leaves the default Buna-N gasket in place when transferring brake fluid or strong oxidiser. The gasket swells, hardens, or dissolves, and the fitting leaks.

Pressure ratings — the most misunderstood spec

Camlocks are low-pressure fittings. The standard rating across virtually all manufacturers is 250 psi (17 bar) at 22°C for sizes 1/2" through 4", dropping to 100 psi (7 bar) or less for sizes 5"–8". Polypropylene and nyglass camlocks are rated lower again — typically 100 psi maximum regardless of size.

Two derating rules matter:

• Temperature derating. The rating assumes the gasket is at room temperature. As temperature rises, the elastomer softens — a fitting rated 250 psi cold may leak at 70 psi at 100°C because the gasket can no longer hold the seating stress. Engineering forum consensus (Eng-Tips): "A coupling rated 250 psig at 70°F will probably leak at 70 psig at 200–212°F."
• Size derating. Larger camlocks have proportionally larger gasket area and proportionally greater hoop stress on the cam arms. A 6" camlock at 250 psi sees roughly 5,000 lbs of separating force on the cam arms — beyond what they're designed to hold. Specifications drop pressure with size to keep the cam arms within their mechanical limit.

The cam mechanism applies minimal gasket seating stress by design — barely enough to compress the elastomer. The fitting cannot achieve high-pressure seals because there's no way to torque the cam arms tighter. If your application needs more than 250 psi, you need flanged or threaded connections, not camlocks. For hydraulic systems above 250 psi, see our Hydraulic Fittings Guide covering BSP, JIC and ORFS high-pressure systems.

The arms-popping-open failure mode

Three causes account for almost all arm-pop incidents:

1. Partial engagement on install. The installer pushed both arms down but one didn't fully click into the cam groove because of a worn pivot, debris in the groove, or rushed installation.
2. Mechanical knock. Forklift traffic, dropped tools, hose whip, or accidental kick lifts an arm. Once one arm releases, the other follows under pressure load.
3. Vibration walking. Pump or engine vibration transmitted up the hose works partially-engaged arms loose over minutes to hours.

Three preventive controls — pick at least one for any service above 50 psi or in vibration-prone installation:

• Safety pins / R-clips. Spring R-clips or wire lanyards through the cam arm holes lock the arm closed mechanically. Once the pin is inserted, the arm cannot lift. The simplest and cheapest control. AIMS stocks Dixon carbon-steel-clip lanyards and 304 stainless pull rings for retrofitting standard camlocks.
• Self-locking arms (Boss-Lock). Dixon's EZ Boss-Lock range integrates a spring-loaded secondary lock that requires deliberate lift-and-release to disengage. The cam arm cannot be knocked loose accidentally — the spring lock has to be intentionally disengaged. Mandatory specification for fuel transfer, mining, and any vibration-prone service. Available in stainless 316 for sanitary plus aluminium and brass.
• Scroll Tail factory-ferruled couplers. Dixon's 316 SS Scroll Tail Camlock Type C and Aluminium Scroll Tail Type C have the hose-tail ferrule factory-pressed onto the fitting — eliminating the hose-clamp interface as a separate failure point and reducing whip if a cam arm does release.

Fuel transfer — bonding, grounding & ATEX

Two distinct electrical concepts apply:

• Bonding connects two conductive objects so they share the same electrical potential. A bonded tank and hose can't develop a voltage difference between them, so no spark can jump.
• Grounding (earthing) connects the bonded system to true earth potential. This drains static charge to ground rather than letting it accumulate.

NFPA, OSHA, and Australian Standard AS 1940:2017 (Storage and Handling of Flammable and Combustible Liquids) all require both bonding and grounding for fuel-transfer operations. A conductive camlock alone does not make a grounded system — the entire flow path from source tank through pump, hose, camlock, to receiving vessel must be electrically continuous and earthed.

For ATEX/IECEx-classified hazardous areas (Zone 0, 1, 2 for fuels and Zone 20, 21, 22 for combustible dusts), additional requirements apply: non-sparking materials (brass body preferred over aluminium because aluminium can spark on impact), certified conductive hose, certified earthing equipment with documented continuity testing, and trained operators.

AIMS stocks Dixon Conductive Aluminium Scroll Tail Camlock Type C specifically designed for grounded fuel-transfer service — the body is electrically conductive through the elastomer-isolated cam arm interface, maintaining grounding continuity from hose to receiving vessel. For complete fuel-transfer system specification including pump, storage and bonding, see our Diesel Transfer Pump Guide and Diesel Fuel Storage Guide.

Food, beverage & sanitary applications

Camlock fittings used in food and beverage service must meet specific construction and material requirements:

• 316 stainless steel body mandatory. 304 SS is acceptable for non-aggressive service but 316 is the food-contact baseline.
• Investment-cast or mirror-polished surfaces. Cam arms must be cleanable to a 3-A sanitary standard — no rough machining marks, no crevices that hold product residue.
• FDA-compliant gasket material. Standard Buna-N is NOT food-safe. EPDM (FDA-grade), platinum-cured silicone, or FDA-compliant Viton for higher-temperature wash-down service.
• No aluminium cam arms in direct food contact. Even on stainless-bodied fittings, aluminium arms can shed oxide into product. Spec all-stainless construction.

AIMS stocks AAP stainless steel Type C couplers and Type E adaptors in the 1/2" to 3" sizes that cover most brewery, winery and dairy transfer applications. For sanitary investment-cast 316 with full 3-A certification, Dixon's premium scroll-tail range is available on request — contact us with your facility certification requirements.

Honest scope statement: AIMS supplies camlock fittings for food/beverage transfer-hose connections. We are not a dedicated Tri-Clamp / brewery vessel fittings specialist. For Tri-Clamp clamps, ferrules, gaskets and vessel-side sanitary fittings, refer to dedicated brewery/dairy fittings suppliers. Camlock-to-Tri-Clamp adapters exist (often used to bridge transfer hose to vessel-mounted Tri-Clamp ports) but the Tri-Clamp side is a different product class.

Mining, slurry & abrasive service

Camlocks in mining service face an entirely different challenge: abrasion from solids-laden flow, not chemical attack. Standard aluminium camlocks survive abrasive slurry surprisingly well when paired with rubber-lined hose — the slurry contacts the hose lining, not the metal fitting body. Failure mode at the fitting is wear at the hose-tail flange where flow accelerates around the geometry change.

Material progression for mining service:

• Aluminium — light slurry, dust suppression, dewatering. Cost-effective for moderate abrasion when paired with rubber-lined hose.
• 316 stainless — corrosive slurry (acid mine drainage, processing chemicals).
• Ductile iron — heavy mining: tailings transfer, cyanide leach, severe abrasion. Service life multiples over aluminium in solids-laden flow.
• Bronze sand-cast — saltwater dewatering, marine mining specialty.

Two specialty Dixon products earn their place in mining service:

• Cam & Groove Witches Hat Strainer 304 Stainless Steel — fits onto a Type B/C/D coupler at the suction end. Cone-shaped mesh strainer keeps debris and large solids out of the pump suction line. Standard specification for dewatering camlocks where the source is open water (sumps, pits, dams).
• Fluidizer Hopper Saver 1-1/2" — specialty dry-powder transfer fitting that fluidises the cement/aggregate/dry chemical in the hose during transfer. Reduces blockage and wear at fitting entry.

Heavy mining bulk transfer commonly uses Dixon scroll-tail Type C in aluminium with factory-pressed ferrules — eliminates the hose-clamp interface that gets eaten by abrasive flow.

Chemical handling — material + gasket pairing

Chemical service requires matching both the body material AND the gasket to the media. Get either wrong and the fitting fails — often within hours for the worst pairings.

For one-off chemical transfer where the specification is uncertain, the safe default is 316 stainless body with PTFE gasket — survives almost anything but expensive. For known media in production volume, match more closely per the table above and the gasket compatibility data in our O-ring guide.

Caravan, RV & water transfer

Caravan and RV water systems use 25mm or 32mm camlocks (sometimes called "John Guest" or "Hansen" style by caravan retailers, though those are different push-fit systems entirely — camlocks are the cam-and-groove version used for fresh water and grey water transfer).

For caravan freshwater service (potable):

• Polypropylene body — UV-stable, lightweight, no corrosion or metal taste in water. AAP Type C 32mm and Type E 25mm in polypropylene are common spec.
• EPDM gasket — FDA-grade EPDM for direct potable-water contact. Avoid Buna-N for drinking water service.
• AS/NZS 4020 certification — Australian Standard for products in contact with drinking water. Check manufacturer documentation if installation is for fixed water service rather than transfer-hose service.

For caravan grey water and waste transfer, aluminium or polypropylene works; chemical resistance isn't an issue.

IBC and drum transfer

IBC (Intermediate Bulk Container) and drum transfer is one of the most common camlock applications — fast, leak-tight, and reusable. Standard IBC camlock fittings:

• IBC top outlet — typically 2" BSP female. Use Type F 2" polypropylene for chemical IBCs, or Type F 2" aluminium for water/fuel IBCs.
• IBC bottom valve outlet — typically 2" BSP male. Use Type A 2" polypropylene or aluminium depending on the contents.
• Drum bung — typically 2" BSP coarse on 200L steel drums, 1" BSP on plastic IBCs. Match the camlock body to the drum contents (poly for chemicals, aluminium for fuel/oil).

For agricultural chemical and IBC service, the AAP polypropylene range is the workshop default — handles most ag chemicals (glyphosate, urea, AdBlue, herbicide concentrates) without swelling or attack. For corrosive concentrates that exceed PP's resistance, step up to 316 stainless body with Viton or PTFE gasket.

Dust caps (Type DC) and dust plugs (Type DP)

Dust caps and dust plugs are the protection accessories for camlock systems — kept in service alongside the working fittings so that when a hose is disconnected, both ends are sealed against contamination.

• Type DC (Dust Cap) — looks like a Type C female coupler but with a sealed back instead of a hose tail. Fits OVER male adapters (A, E, F) to seal them when disconnected. AAP stocks DC Aluminium, DC Polypropylene, DC Stainless Steel, and DC Nyglass.
• Type DP (Dust Plug) — looks like a Type E male adapter but with a sealed back instead of a hose tail. Fits INTO female couplers (B, C, D) to seal them when disconnected. AAP stocks DP Aluminium, DP Polypropylene, DP Stainless Steel, and DP Nyglass.

Dust covers earn their cost in any installation where camlocks are disconnected and reconnected regularly — workshop transfer hoses, IBC connections, fuel decanting. A cam-groove damaged by a forklift impact or packed with dirt will leak on the next connection. Cheap insurance.

Specialty types — Boss-Lock, Scroll Tail, Spool, API

Beyond the standard A–F + DC + DP types, the Dixon specialty range covers several niche but production-critical configurations:

• EZ Boss-Lock — Dixon's self-locking cam arm system. Spring-loaded secondary lock prevents arm pop-open from vibration or accidental knocks. Mandatory for fuel transfer, mining and vibration service.
• Scroll Tail (factory ferrule) — hose-tail ferrule pressed onto the fitting at the factory using Dixon's notched-shank crimp pattern. Eliminates the field-installed hose clamp as a failure point. Used in production where reliability matters more than field-replaceability.
• Type AA Spool Adaptor — double-male cam adapter (cam-groove on both ends). Used to join two female couplers in the same line. Available in brass and bronze sand-cast.
• 68° elbow Type C — right-angle hose-tail for installations where space is tight. Aluminium and brass versions stocked.
• API Drop Adaptor — tanker truck specialty. Used at the bottom-loading interface for fuel tanker trucks meeting API RP 1004 bottom-loading and overfill protection standards.
• API Dust Cap with Quick Release Lever — heavy-cycle service where opening/closing the dust cap 50+ times a day with a screw-on cap is impractical. Lever release.
• Conductive Aluminium Type C — purpose-built for fuel-transfer grounding service. Maintains electrical continuity from hose through to receiving vessel.
• Replacement parts — Dixon stocks individual 316 stainless cam arm handles + ring + pin assemblies, brass, and pull rings. Replace a damaged arm rather than scrapping the whole fitting.

Standards — A-A-59326, EN 14420-7, AS 1940

There is no dedicated Australian Standard for camlock fittings. Australian suppliers operate to the international standards (A-A-59326 and EN 14420-7), which is why camlocks are dimensionally interchangeable across AU, US and EU stock. Australian regulatory context is the storage-and-handling standards (AS 1940 for flammables, AS/NZS 4020 for potable water) plus pipeline scope-out (AS 2885 — camlocks are temporary connections, not permanent pipeline fittings).

NOT a camlock — Storz, Bauer, Tri-Clamp disambiguation

Three other quick-connect systems are commonly confused with camlocks in product searches:

• Storz — symmetric hermaphrodite couplings used in firefighting and emergency-services water supply. Both halves are identical (no male/female), connected with a quarter-turn lug rotation. Standard sizes 25, 38, 52, 65, 75, 90, 110, 125 mm. Used on fire hose, fire hydrants, fire pumps. Not interchangeable with camlocks. AIMS does not stock Storz — refer to firefighting equipment specialists.
• Bauer — ball-and-socket lever-clamp couplings used in agriculture, particularly slurry tankers, irrigation mains, and large-bore liquid manure transfer. Quick-action lever clamps the male half into a tapered female socket with a rubber gasket. Common in AU dairy and ag. Not interchangeable with camlocks. AIMS does not stock Bauer — refer to agricultural equipment specialists.
• Tri-Clamp — sanitary clamp couplings used in brewery, dairy, food and pharma vessel work. Two flat ferrules sandwich a gasket and are clamped together with a hinged clamp band. Sanitary-grade only. Used vessel-side, not transfer-hose-side. Often paired with camlocks via Tri-Clamp-to-camlock adapter at the vessel-to-hose transition. AIMS does not stock Tri-Clamp — refer to brewery/dairy fittings specialists.

If you've arrived at this guide looking for one of those three systems, the product is similar in function (quick-connect coupling) but completely different in mechanism and not interchangeable.

Bunnings vs industrial-grade — what changes

Camlock fittings are sold at consumer retail (Bunnings, Total Tools, eBay) and through industrial supply (AIMS, Dixon distributors, specialist fittings suppliers). The price difference can be 3–5× for ostensibly the same fitting. The differences that matter:

• Material tolerance. Genuine industrial-spec aluminium camlocks are machined to ±0.1mm on the cam groove. Cheap import aluminium runs ±0.3mm. Loose tolerance means partial cam engagement, gasket compression variability, and arm-pop failures.
• Alloy quality. "Aluminium" import camlocks are sometimes zinc-alloy with aluminium colouring — torque resistance approximately 8 Nm at the cam arm vs >22 Nm on genuine industrial aluminium-bronze cam arms. Under cycling load the cheap arms fail at the pivot pin within months.
• Gasket grade. Consumer fittings ship with generic Buna-N — fine for water but NOT food-grade, NOT chemical-grade, NOT FDA-compliant. Industrial fittings ship with documented gasket grade and certificates available on request.
• Cam arm pivot. Genuine industrial fittings use stainless steel pivot pins with anti-rotation features. Cheap imports use mild steel pins that corrode and seize.
• Service life. Industrial-spec camlocks routinely run 5–10 years in moderate service. Cheap imports commonly fail within 1 year.

For one-off or low-cycle service, cheap import camlocks may be adequate. For any production use, fuel transfer, food contact, or safety-critical application, specify industrial-grade. The cost premium pays back in service life and freedom from failure-mode investigations.

The AIMS camlock range — AAP house brand + Dixon specialty

AIMS Industrial stocks 99 camlock fittings across two complementary brands:

AAP (Australian Premier) — our house brand, 33 SKUs, the workshop volume tier:

• Aluminium range — Type A, B, C, D, DC, DP, E, F — general industrial workhorse range. Sizes 1/2" through 4".
• Polypropylene range — Type A, B, C, D, DC, DP, E, F — chemicals, UV-exposed service, drum transfer, caravan freshwater.
• Stainless steel range — Type A, B, C, D, DC, DP, E, F — food/beverage transfer, aggressive chemicals, corrosive service.
• Nyglass (glass-filled nylon) range — Type A, B, C, D, DC, DP, E, F — UV-stable workshop service, lighter chemical handling, lower cost than PP.

Dixon — global premium specialty, 66 SKUs:

• Complete A–F + DC + DP range in BSP across aluminium, stainless, brass and bronze.
• Boss-Lock and EZ Boss-Lock self-locking arm range for vibration-prone and safety-critical service.
• Scroll Tail factory-ferruled couplers in aluminium and 316 SS.
• Conductive Aluminium Type C for grounded fuel transfer.
• Bronze sand-cast range for premium marine and saltwater service.
• Type AA Spool Adaptor for joining two female couplers in-line.
• 68° elbow Type C for tight installations.
• API Drop Adaptor and API Dust Cap with Quick Release Lever for tanker-truck service.
• Witches Hat Strainer 304 SS for pump-suction debris protection.
• Fluidizer Hopper Saver for dry-powder transfer.
• Replacement parts — cam arm handles, rings, pins, pull rings, lanyards.

Anything outside the live stocked range — custom sizes, specialty materials (ductile iron heavy mining, dedicated 3-A sanitary), or full Tri-Clamp transition assemblies — AIMS can source through the Dixon and AAP specialty channels. Contact us with your application requirements.

8 common camlock mistakes

Frequently Asked Questions

What are the different types of camlock fittings (A through F)?

Camlocks fall into eight types based on what's on the non-cam end. Type A = male cam adapter with female thread. Type B = female cam coupler with male thread. Type C = female cam coupler with hose tail. Type D = female cam coupler with female thread. Type E = male cam adapter with hose tail. Type F = male cam adapter with male thread. Type DC = dust cap (fits over male adapters). Type DP = dust plug (fits into female couplers). The cam interface itself is universal — any male type mates with any female type of the same bore size.

How do I know which camlock types mate together?

Male adapters (A, E, F) mate with female couplers (B, C, D). The most common pairings: A+C (pump-to-hose, the workhorse), D+E (tank-to-hose), B+C (equipment-to-hose), and E+C (hose-to-hose joining). Dust caps (DC) fit OVER male adapters; dust plugs (DP) fit INTO female couplers. Type F is the rarest — male × male thread — used for threaded equipment to threaded port connections.

What pressure can a camlock fitting handle?

Standard metal camlocks (aluminium, brass, stainless) are rated 250 psi (17 bar) cold for 1/2" to 2" sizes, dropping to 150 psi for 2-1/2" to 4", and 75–100 psi for 5" to 8". Polypropylene and nyglass are rated lower — typically 100 psi maximum. Temperature derating is significant: a fitting rated 250 psi at 22°C may leak at 70 psi at 100°C because the gasket softens. Camlocks are low-pressure fittings — anything above 250 psi needs flanged or threaded connections.

Why are my camlock arms popping open under pressure?

Three causes: partial cam-arm engagement on install (one arm not fully clicked into the groove); mechanical knock from forklift traffic, dropped tools, or hose whip; or vibration walking the arms loose over time. Three preventive controls: R-clips or safety pins through the cam arm holes; self-locking arms (Dixon EZ Boss-Lock); or scroll-tail factory-ferruled couplers that eliminate the hose-clamp failure point. Mandatory specification for fuel transfer, mining, and vibration-prone service.

What's the difference between aluminium, brass, and stainless steel camlocks?

Aluminium is the general industrial default — water, fuel, oil, slurry, dry powder transfer. Not food-grade and not for seawater. Brass is the marine, non-sparking, and ATEX fuel-transfer specification. Stainless steel (316 specifically) is the food/beverage/pharma standard and the choice for aggressive chemicals or chloride-rich service. Polypropylene handles acids and alkalis that destroy metal but has lower pressure rating and goes brittle below 0°C. Match material to media chemistry first, then to application context.

Are camlock fittings food-grade?

Stainless steel 316 camlocks with FDA-compliant gasket (EPDM or platinum-cured silicone) are food-grade. Standard aluminium camlocks with Buna-N gaskets are NOT — aluminium oxide can shed into product and Buna-N is not FDA-compliant for direct food contact. For 3-A sanitary applications (dairy, brewery vessel, pharma), specify investment-cast 316 SS with mirror polish on the cam arms. AIMS stocks 316 SS camlocks in 1/2" to 3" sizes covering most brewery, winery and dairy transfer applications.

Can I use camlocks for diesel and fuel transfer?

Yes — aluminium, brass, or stainless steel body with Buna-N or Viton gasket. Critical safety requirements: bonding and grounding the entire transfer path (tank → pump → hose → camlock → receiving vessel) to prevent static spark ignition; conductive camlocks (Dixon Conductive Aluminium Scroll Tail Type C) for grounding continuity through the fitting; R-clips or self-locking arms to prevent arm pop-open; and brass body specification for ATEX/IECEx-classified hazardous areas (aluminium can spark on impact). Compliance with AS 1940:2017 storage and handling of flammable liquids.

Do I need to ground camlocks for fuel transfer?

Yes — bonding and grounding are both required by AS 1940:2017 and international fuel-handling standards (NFPA, OSHA). Bonding equalises electrical potential between the source and receiving vessels; grounding drains static charge to earth. A conductive camlock alone does not make a grounded system — the entire flow path must be electrically continuous and earthed. Ultra-low-sulphur diesel generates static charge significantly faster than older diesel formulations, so the grounding requirement applies to diesel as well as petrol.

What's a dust cap and dust plug used for?

Type DC (dust cap) fits over male camlock adapters (A, E, F) to seal them against contamination when disconnected. Type DP (dust plug) fits into female camlock couplers (B, C, D) to seal them against contamination when disconnected. They protect the cam groove and gasket-seating face from debris that would cause leaks on the next connection. DC and DP are NOT pressure-rated — they're for sealing disconnected ends, not for capping pressurised lines. For pressure-testing, use a threaded blanking plug behind a Type B or D coupler.

How do I measure camlock size for my hose?

Camlock size refers to the internal bore diameter, which matches the hose internal diameter (ID). A 2" camlock has a 2" bore and fits 2" ID hose. The thread size on a Type A/B/D/F fitting is independent of the bore — typically matched but can vary. Australian sizing uses imperial bore (1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 3", 4" and so on) — a 50mm camlock is the same as a 2" camlock, just metric terminology. Match the camlock bore to the hose ID, not the hose outer diameter.

BSP or NPT thread on camlocks for Australian equipment?

BSP (British Standard Pipe) is the Australian standard — match BSP camlocks to Australian-built pumps, tanks, IBCs and valves. NPT (National Pipe Tapered) is the US/Canadian standard — match NPT camlocks to US-imported equipment (Honda diesel pumps, American IBCs, US-spec compressors). The two are NOT interchangeable. BSP itself has BSPP (parallel) and BSPT (tapered) variants — most camlock threads are BSPP because they seal at the gasket face, not at the thread.

What gasket material should I choose for my fluid?

Buna-N (Nitrile, NBR) is the metal-camlock default — petroleum, oils, fuels, water, mild service. EPDM is mandatory for brake fluid and phosphate-ester hydraulic fluids (Skydrol), and good for water and steam — never for petroleum (severe swelling). Viton (FKM) handles aggressive chemicals and high temperatures up to 200°C — never for ketones or brake fluid. PTFE handles ultra-aggressive chemicals where elastomers fail. Silicone for food/pharma direct contact. Match the gasket to the media first — gasket-to-media mismatch is the most common camlock failure cause.

Can I use a camlock fitting for high pressure?

No. Camlocks are low-pressure fittings — 250 psi (17 bar) maximum cold rating for smaller sizes, dropping with size and temperature. The cam mechanism applies minimal gasket seating stress by design and cannot achieve high-pressure seals. For applications above 250 psi (hydraulic systems, high-pressure water cleaning, high-pressure gas), specify flanged connections or threaded BSP/JIC/ORFS fittings. See our Hydraulic Fittings Guide for the high-pressure system reference.

What's the difference between camlock, Storz, and Bauer fittings?

Camlock (cam-and-groove) uses two pivoting cam arms locking into a groove on the male half — the universal industrial transfer-hose standard. Storz is the firefighting standard — symmetric hermaphrodite couplings with quarter-turn lug rotation, both halves identical. Bauer is the agricultural standard — ball-and-socket lever-clamp couplings used on slurry tankers, irrigation mains and large-bore manure transfer. The three systems are completely different mechanisms and NOT interchangeable. Tri-Clamp is a fourth system used in sanitary brewery/dairy vessel work — two flat ferrules with a clamp band, paired with camlocks at the vessel-to-hose transition.

Are Bunnings camlocks the same as industrial-grade?

No. Consumer-tier camlocks (Bunnings, eBay, AliExpress) typically have looser machining tolerance (±0.3mm vs ±0.1mm industrial), inferior aluminium alloy or zinc-alloy substitution, generic Buna-N gaskets that aren't food or chemical grade, mild-steel pivot pins that corrode, and weaker cam-arm pivot mechanisms. Service life can be under 1 year vs 5–10 years for industrial-grade. Acceptable for one-off domestic transfer but a false economy for production use, fuel transfer, food contact, or safety-critical service. For workshop and industrial applications, specify industrial-grade through suppliers like AIMS.