Buy Machine Screws Online in Australia
Machine Screw Selection — Quick Reference
Machine screws — SMALL FASTENERS with METRIC OR UNIFIED threads for machinery + electronics + electrical + workshop assembly. Many head styles (Pan + Cheese + Round + Countersunk + Hex Socket). Threaded full length.
| Machine Screw Type | Best For |
|---|---|
| Pan Head Machine | Workshop common — see pan head |
| Cheese Head Machine | Recessed below surface |
| Round Head Machine | Decorative + traditional |
| Countersunk Machine | Flush — see countersunk |
| Hex Socket Cap Machine | See socket head cap screws |
| Slotted / Phillips / Pozidriv / Torx | Driver match |
| 304 / 316 Stainless | Outdoor + chemical |
| Metric M2 - M10 | Workshop electronics + assembly |
Critical: Use proper DRIVER — wrong driver = cam-out + slot damage. Match HEAD STYLE to application — flush + sub-surface + decorative + accessible. Brands: Bremick, Hobson. Companion: screws, fasteners, pan head screws.
Machine Screws — Metric & UNC Panel and Equipment Fasteners
Machine screws are threaded fasteners for tapped holes and nuts in equipment panels, enclosures, electronics, switchboards, and precision machinery. AIMS Industrial sells machine screws in metric (ISO) and imperial (inch) sizes — pan head, countersunk, cheese head, and socket head profiles with Phillips, slotted, Pozidriv, and hex socket drives in zinc-plated and 304/316 stainless steel.
Machine Screws We Stock
- Pan Head Machine Screws: Pan head machine screws (ISO 7045) with Phillips or Pozidriv drive for panel and enclosure assembly — the flat-base dome-shaped head provides a large bearing surface and a flush, clean appearance on exposed panel faces. Available M3 to M12.
- Countersunk (CSK) Machine Screws: Countersunk machine screws (ISO 7046) sit flush with or below the panel surface — used where a protruding head is not acceptable for appearance, safety, or mechanical clearance reasons. Phillips and Pozidriv drive in metric M3 to M12.
- Cheese Head Machine Screws: Cheese head machine screws (ISO 1207) with slotted drive for precision instruments, electrical terminals, and panel fitting where a narrow, cylindrical head profile is required for close fastener spacing. Available M2 to M8.
- UNC Machine Screws: UNC (American standard) machine screws for electronic enclosures, computer equipment, rack-mount hardware, and American-designed equipment using inch thread sizes (2-56, 4-40, 6-32, 8-32, 10-32, 1/4-20, 3/8-16).
- 316 Stainless Steel Machine Screws: Stainless steel machine screws for food processing equipment, marine electronics, and corrosive environment panel installations.
Machine Screw Selection Guide
- Drive Type Selection: Phillips (PH) drive provides good cam-out resistance for assembly; Pozidriv (PZ) provides higher torque transmission before cam-out. Slotted drive for precision applications where a torque-controlled screwdriver or jewellers screwdriver is used. Hex socket for high-torque requirements in a small head profile.
- Thread Engagement: Machine screws should engage a minimum of 1.5× the screw diameter in thread depth in a tapped hole. Insufficient thread engagement causes thread stripping — particularly in soft materials like aluminium and plastic enclosures.
- Metric vs UNC: Confirm whether the tapped hole is metric or UNC (imperial) before ordering. Metric and UNC threads are not interchangeable — a metric screw forced into a UNC tapped hole (or vice versa) will cross-thread and destroy the hole.
Australian Business, Local Supply: As a proudly Australian business since 1988, we stock locally and work with trusted local Australian manufacturers and distributors to ensure fast, reliable supply.
Expert Support: Need help buying the right product for your application? Contact our team for application-specific advice or request a quote.
See our full fasteners range including self-tapping screws, hex head screws, grub screws, Bolts and Screws.
People Also Ask — Machine Screws
Q: What's a machine screw?
A machine screw is a small threaded fastener (typically M2 to M6 metric, #2 to 1/4-inch imperial) with a uniform machine thread along its full length — designed to thread into a pre-tapped hole or use a nut. Distinguished from wood screws (tapered point, coarse thread) and self-tapping screws (cutting threads on entry). Used in electronics assembly, appliance manufacturing, small mechanical assemblies, and any application where small fasteners thread into machined holes.
Q: What head styles do machine screws come in?
Pan head: rounded top, flat under-head, low-profile general use. Cheese head: tall cylindrical head, traditional design. Round head: domed top, decorative or sealing applications. Countersunk (flat) head: 90° conical countersunk for flush mounting. Truss head: very wide low-profile head, spreads load on thin sheet. Button head: shallow dome, modern aesthetic. Match head style to the design requirement: countersunk for flush, pan/round for general, truss for sheet-metal.
Q: Phillips, slotted, or hex socket on machine screws?
Phillips (cross): the most common driver, good for fast assembly. Slotted: traditional, lower torque capacity, prone to driver slip. Hex socket (Allen key): higher torque capability, less head wear, used for engineering machine screws. Pozidriv (PZ): improved Phillips with better cam-out resistance. Torx (star): highest torque capability, premium electronics and mechanical assemblies. For workshop kit, Phillips is the standard; hex socket cap screws for higher-torque applications.
Q: Stainless or zinc-plated machine screws?
Zinc-plated carbon steel: workshop standard, low cost, indoor use. Stainless 304 (A2): indoor electronics, moderate outdoor, food-adjacent applications. Stainless 316 (A4): marine, coastal, chemical environments. Brass: decorative, electrical (non-magnetic), specialty applications. Match the material to the environment. Don't mix stainless and zinc-plated screws on the same assembly — galvanic corrosion at the contact point. For exterior or marine assemblies, stainless throughout.
Q: What's the difference between M3, M4, and M5 machine screws?
Numerical designation = thread diameter in millimetres. M3 (3mm OD) = small electronics, computer/PC assemblies, light brackets. M4 (4mm OD) = appliance assembly, mid-range electronics, light mechanical. M5 (5mm OD) = mid-range mechanical assemblies, heavier electronics. M6 (6mm OD) = standard workshop hardware threshold — above this you're into 'bolt' territory. Thread pitch: M3=0.5mm, M4=0.7mm, M5=0.8mm, M6=1.0mm (all standard coarse). See [Metric Bolt Size Guide](/blogs/product-guides/metric-bolt-size-guide).