Buy High Pressure Fittings Online in Australia
High-Pressure Fitting Standards — Quick Reference
High-pressure fittings connect hoses, tubes and pipes in hydraulic, pneumatic and process systems at elevated pressures. Selection requires matching THREAD STANDARD (JIC vs BSP vs SAE vs NPT) and PRESSURE RATING to the system. Mixing standards causes leaks at best, catastrophic failure at worst. AIMS stocks the workshop-essential range across major thread forms.
| Thread Standard | Sealing Method | Pressure Rating | Common Use |
|---|---|---|---|
| JIC (37° Flare) | Metal-to-metal cone seal | Up to 700 bar / 10,000 psi | US hydraulic systems, mining plant, off-highway equipment |
| BSP Parallel (BSPP / G-thread) | O-ring or bonded seal washer | Up to 350 bar / 5,000 psi | European + Australian hydraulics, ISO 1179 standard |
| BSP Tapered (BSPT / R-thread) | Thread interference + sealant (PTFE or anaerobic) | Up to 250 bar / 3,600 psi | Process pipework, Australian general fluid systems |
| SAE ORB (O-Ring Boss) | O-ring face seal | Up to 420 bar / 6,000 psi | Pump + cylinder ports, North American hydraulic standard |
| SAE Code 61 / 62 Flange | O-ring face seal under split flange | Code 61: 350 bar; Code 62: 420 bar | Large-bore high-pressure connections, mining hydraulics |
| NPT (US Tapered) | Thread interference + PTFE | Up to 280 bar / 4,000 psi | US-origin equipment, instrument tubing, lower pressure |
| Metric ISO 6149 | O-ring face seal | Up to 420 bar / 6,000 psi | European hydraulic equipment, metric port connections |
Never mix standards. A JIC 37° and SAE 45° fitting LOOK similar but will leak. A BSP and NPT both being tapered will THREAD TOGETHER but won't seal — different thread pitches at different angles. For sealing on BSPP / SAE ORB, use the right O-ring or Dowty washer — see our Dowty washer guide. Companion ranges: hydraulic fittings, hose fittings, pipe fittings.
High Pressure Fittings for Hydraulic and Pneumatic Systems
High pressure fittings are critical components in hydraulic, pneumatic, and process piping systems, providing reliable sealed connections between hoses, tubes, pipes, and system components at elevated operating pressures. Selecting fittings that are correctly rated for the system pressure, compatible with the fluid being handled, and matched to the thread standard used in the system is essential for safe, leak-free operation. AIMS stocks a comprehensive range of high pressure fittings from leading hydraulic and fluid power brands in common thread forms and pressure ratings.
Thread Standards and Compatibility
High pressure fittings are available in several thread standards that are not directly interchangeable. BSP (British Standard Pipe) in both parallel (BSPP, G thread) and tapered (BSPT) forms are the most common in Australian hydraulic and pneumatic systems. NPT (National Pipe Thread) tapered fittings are frequently encountered on imported American equipment. JIC (Joint Industry Council) 37-degree flare fittings are widely used in high-pressure hydraulic lines due to their reliable metal-to-metal seal. Metric compression fittings (DIN 2353) are specified on European hydraulic equipment. Always verify the thread form on both the fitting and the mating port before connecting — mismatched threads result in leaks and can damage sealing surfaces.
Pressure Ratings and Material Selection
High pressure fittings are pressure-rated based on their material, wall thickness, and connection type. Carbon steel fittings are standard for most industrial hydraulic applications and are compatible with mineral hydraulic oils, water-glycol fluids, and petroleum-based fluids. Stainless steel fittings are specified for corrosive fluids, food-grade applications, and offshore environments. Brass fittings are suitable for lower pressure pneumatic systems and certain fluid media but should not be used in high-pressure hydraulic circuits. Always verify the fitting's maximum working pressure rating against the system's maximum operating pressure, including pressure spikes.
Sealing Methods
Different high pressure fitting types rely on different sealing mechanisms. BSPT and NPT tapered threads seal on the thread form itself, typically with the addition of PTFE tape or anaerobic thread sealant. BSPP parallel threads use a bonded seal (Dowty washer) or O-ring face seal. JIC fittings rely on metal-to-metal contact on the 37-degree cone seat. O-ring face seal (ORFS) fittings provide the most reliable leak-free connection for high-vibration applications and are increasingly specified in new hydraulic system designs.
For help selecting fittings for your system, or to discuss bulk pricing, contact our team.
AIMS stocks high pressure fittings in the most common BSP, JIC, and ORFS configurations for immediate dispatch. For non-standard sizes, exotic materials, or project-specific quantities, contact our team and we will source promptly.