Buy Socket Head Cap Screws Online in Australia
Socket Head Cap Screw Grade & Material — Quick Reference
Socket head cap screws (SHCS) are the workshop standard for precision fastening — internal hex (Allen) drive, high tensile strength, available across grades + materials. Selection turns on load (Grade 8.8 / 10.9 / 12.9 / Bumax for high-strength), corrosion environment (zinc/black oxide/SS304/SS316/Bumax), and size (M3 – M30+ metric).
| Grade / Material | Tensile Strength | Best For |
|---|---|---|
| Grade 12.9 (Black Oxide Steel) | 1,200 MPa | Engineering + machine assembly — highest standard SHCS strength |
| Grade 10.9 (Zinc-Plated Steel) | 1,040 MPa | General workshop — strong + corrosion-protected (light) |
| Grade 8.8 (Zinc-Plated Steel) | 800 MPa | Light + medium duty fastening |
| 304 Stainless Steel | 500 – 700 MPa | General corrosion-resistant + indoor/outdoor — NOT marine |
| 316 Stainless Steel | 500 – 700 MPa | Marine, food, chemical — chloride-resistant |
| Bumax 88 Stainless | 800 MPa (= Grade 8.8 in SS) | Combined corrosion + medium strength — pharma/food/marine engineering |
| Bumax 109 Stainless | 1,040 MPa (= Grade 10.9 in SS) | High-strength corrosion-resistant — premium application |
| Bumax 125 Stainless | 1,250 MPa (exceeds 12.9 in SS) | Highest-strength SS — aerospace, defence, critical engineering |
Critical: Match the bolt grade to the application — overuse of 12.9 in soft material = no benefit, just cost. Use the right Allen key size (M5 = 4mm hex, M6 = 5mm, M8 = 6mm, M10 = 8mm, M12 = 10mm). Brands: Bremick, Hobson, Champion, GJ Works, Inox World, SOKO, Bumax. Companion: fasteners, torque chart, SHCS guide, bolt grade chart.
Socket Head Cap Screws in Steel, Stainless and Bumax from Bremick, Hobson, Inox World and SOKO
AIMS Industrial sells an extensive range of socket head cap screws from Bremick, Hobson, Champion, GJ Works, Inox World, SOKO and Bumax — metric Allen key cap screws in black oxide steel, zinc-plated steel, 304 stainless steel, Grade 316 marine stainless steel and high-strength Bumax for precision engineering, machine building, industrial equipment assembly and corrosion-resistant fastening applications.
Brands in This Range
- Bremick: Bremick is an Australian fastener distributor supplying a comprehensive range of metric socket head cap screws in black and zinc-plated finishes for general engineering and industrial applications.
- Hobson: Hobson is a leading Australian fastener supplier distributing socket head cap screws in multiple grades and materials for industrial and engineering use.
- Inox World: Inox World specialises in Grade 316 marine-grade stainless steel fasteners. Inox World socket head cap screws are specified for marine, coastal, food processing and chemical plant applications.
- SOKO: SOKO supplies metric socket head fasteners for industrial and engineering fastening applications, providing cost-effective standard-grade socket head cap screws in commonly specified sizes.
- Bumax: Bumax is a Swedish manufacturer of ultra-high-strength stainless steel fasteners. Bumax socket head cap screws achieve tensile strengths comparable to or exceeding standard high-tensile steel fasteners while providing the corrosion resistance of austenitic stainless steel — specified for demanding applications in oil and gas, defence, subsea and critical engineering.
Materials and Grades
- Black Oxide Steel (Property Class 12.9): The standard specification for socket head cap screws in engineering applications. Class 12.9 provides high clamping force and is used in machine building, tooling and precision engineering where high joint preload is required.
- Zinc-Plated Steel: Moderate corrosion resistance for indoor and protected environments. Suitable for general industrial and workshop assembly where black oxide appearance is not required.
- 304 and 316 Stainless Steel: 304 stainless provides general corrosion resistance. Grade 316 is specified for marine, coastal, chemical and food processing environments. Stainless socket head cap screws are lower strength than Class 12.9 steel — not a like-for-like substitution in high-stress applications.
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