Buy Button Head Socket Screws Online in Australia
Common Questions about Button Head Socket Screws
What is a button head socket screw?
A button head socket screw has a wide, low-profile rounded dome head with an internal hex Allen drive. The dome sits slightly proud of the surface and gives a finished appearance plus a large bearing surface — used widely on machinery covers, jig and fixture work, electronics enclosures and decorative assembly where neat finish counts.
What is the difference between a button head and a socket head cap screw?
Socket head cap screws have a tall cylindrical head and seat into a counterbore — used for high-strength clamping where the head can recess flush. Button head screws have a wide low dome that sits above the surface — used where appearance and a low profile matter, but they hold less clamp load than equivalent cap screws.
What sizes do button head socket screws come in?
Metric button heads run M3 to M16 in standard workshop sizes. Imperial run from number six to half inch UNC and UNF. Length is measured from under the head to the screw tip. AIMS stocks zinc-plated alloy, stainless 304 and stainless 316 button head screws across the common workshop range in both systems.
What is the Allen key size for a button head screw?
Each button head size uses a specific hex key. M3 typically takes a 2 millimetre hex, M4 takes 2.5, M5 takes 3, M6 takes 4, M8 takes 5, M10 takes 6 millimetre. Imperial sizes use matching imperial hex keys. Match the key to the screw exactly to avoid stripping the socket recess.
Can button head screws be used outdoors?
Stainless 304 button head screws suit general outdoor and damp use. Stainless 316 suits coastal and marine environments where chloride exposure attacks 304. Zinc-plated alloy steel button heads work outdoors but need periodic inspection and replacement as the plating wears through to bare steel. AIMS stocks all three for matching the environment.
Button Head Socket Screw Selection — Quick Reference (ISO 7380)
Button head socket screws (ISO 7380) have a low-profile domed head — for applications where standard SHCS is too tall, snag-prone, or visually unsuitable. Internal hex (Allen) drive. NOT for high-torque applications — bearing area limits clamp load vs cap head.
| Size | Hex Key | Best For |
|---|---|---|
| M4 | 2.5 mm | Small fixtures, electronics enclosures, decorative |
| M5 | 3 mm | Light enclosures + cosmetic + panel mounting |
| M6 | 4 mm | Machinery guarding + general panel mounting — common workshop |
| M8 | 5 mm | Larger panel + cosmetic + medium-duty fixtures |
| M10 | 6 mm | Heavier panel work + structural cosmetic |
| M12 | 8 mm | Larger machinery guarding + structural cosmetic |
| M16 | 10 mm | Heavy structural cosmetic + large enclosures |
Material grades: Grade 10.9 alloy steel (highest strength workshop choice) | 304 stainless (general corrosion + indoor outdoor) | 316 stainless (marine + chemical). Critical: Button head clamp load is ~75% of equivalent cap head (smaller bearing area) — use cap head for high-load structural; button head for cosmetic + panel + light-load. ISO 7380 standard differs from US standard imperial button head dimensions. Companion: socket head cap screws, metric fasteners, all fasteners, screw head types guide.
Button Head Socket Screws — Low-Profile Cap Screws (ISO 7380)
Button head socket screws (ISO 7380) provide a low-profile, domed head for applications where a standard socket head cap screw is too tall, or where a smooth, snag-free surface profile is required. AIMS Industrial stocks button head socket screws in metric fasteners Grade 10.9 alloy steel and 316 stainless steel from M4 to M16 — for machinery guarding, enclosures, panel mounting, and cosmetic fastening applications.
Button Head Socket Screws We Sell
- Grade 10.9 Alloy Steel — Black Oxide: Grade 10.9 (class 10.9) alloy steel button head socket screws with black oxide finish — providing corrosion resistance superior to plain steel while maintaining a controlled, dark appearance. For machine frames, enclosures, and structural panel fastening where appearance and strength are both important.
- 316 Stainless Steel Button Head Screws: 316 grade stainless steel button head cap screws for corrosion-resistant applications in food processing, marine, chemical, and washdown environments. 316 ss provides superior chloride resistance compared to 304 ss — essential for coastal and marine installations.
- Size Range M4 to M16: Button head socket screws available from M4 (light panel and PCB mounting) through M10 and M12 (machinery guarding and enclosure frames) to M16 (structural panel and cover plate applications). All to ISO 7380 dimensional standard.
- Hex Socket Drive: Button head socket screws use a recessed hex (Allen) drive — requiring a matching hex key or hex bit for installation. The recessed drive prevents accidental damage to adjacent surfaces and provides higher torque transmission than Phillips or Pozidriv drives.
Button Head Screw Selection Guide
- Head Height vs Socket Head: Button head socket screws have approximately half the head height of standard socket head cap screws (ISO 4762) — but the button head also has a wider bearing surface area. The lower head height is suitable for applications with restricted clearance over the fastener head.
- Reduced Torque Capacity: The reduced head height of button head screws limits the available torque compared to standard socket head cap screws. Do not use button head screws in joints requiring high-torque preloading — use standard cap screws (ISO 4762) for high-load joints.
- Grade 10.9 vs 8.8: Grade 10.9 provides higher tensile strength than Grade 8.8 — allowing a smaller diameter fastener to carry the same load. Confirm the minimum required fastener grade from the design specification before selecting 10.9 or 8.8.
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