Buy Hex Bolts Online in Australia
Hex Bolt Selection — Quick Reference
AIMS stocks COMPREHENSIVE hex bolt range across metric + imperial + Whitworth + multiple Classes + finishes. Workshop + structural + machinery + automotive fastening. Match Class + thread + material + finish to application.
| Hex Bolt Type | Best For |
|---|---|
| Class 4.6 Hex Bolt | Light-duty general fastening |
| Class 8.8 Hex Bolt | Workshop standard — most common |
| Class 10.9 Hex Bolt | Heavy fastening + machinery |
| Class 12.9 Hex Bolt | Highest strength — critical applications |
| 304 Stainless Hex Bolt | Outdoor + chemical + marine |
| 316 Stainless (Marine Grade) | True marine + chloride |
| Hot-Dip Galvanised | Heavy outdoor + extended corrosion |
| Zinc-Plated | Indoor + general use |
| Metric M5 - M30+ | AU + EU engineering |
| UNC / UNF Imperial | US-origin equipment |
| BSW (Whitworth) | Older AU + UK equipment |
| Cup Head / Coach Bolts | Timber + structural |
Critical: Match BOLT CLASS to NUT CLASS — mixing weakens joint to lower class. NEVER mix stainless + carbon steel (galvanic corrosion). Torque to spec — see metric bolt torque chart. Brands: Bremick, Hobson, Inox World. Companion: hex bolts + nuts, fasteners, washers.
Hex Bolts
AIMS Industrial stocks hex bolts across metric, UNC and specialty specifications — covering grade 8.8 zinc-plated high tensile, 304 and 316 stainless steel, UNC Grade 5 and Grade 8, nylon, and Bumax high-strength stainless. Hex bolts are the most widely used structural fastener in industrial, mining, construction and manufacturing applications.
Metric Grade 8.8 High Tensile
The Metric Hex Bolt Grade 8.8 High Tensile Zinc Finish is the standard metric structural bolt for mechanical assemblies, structural steelwork and general industrial fastening. Available from M6 to M24, zinc-plated for mild corrosion protection. Pair with a Grade 8 nut and hardened washer for critical joints.
Metric Stainless Steel
The Metric Hex Bolt 316 Stainless Steel is the preferred specification for marine, coastal, food-grade and chemical environments where long-term corrosion resistance is required. 316 grade provides superior chloride resistance compared to 304. For less demanding stainless applications, the Champion CA200 Hex Flange Set Screw Metric Gr8.8 Assortment Kit provides a broad selection of flanged metric hex bolts in a single kit.
UNC Imperial Hex Bolts
UNC hex bolts are required for older Australian plant, mining equipment and imported machinery in imperial thread. The UNC Hex Bolt Grade 5 High Tensile Zinc Finish and UNC Hex Bolt Grade 8 High Tensile Zinc Finish cover both standard and heavy-duty structural requirements. Grade 8 UNC bolts are specified in critical joints where higher proof load is required. For non-ferrous or electrically insulating applications, the UNC Hex Head Bolt Nylon Natural provides a lightweight, corrosion-proof alternative.
Bumax High-Strength Stainless
Bumax bolts combine the corrosion resistance of stainless steel with tensile strength equivalent to or exceeding carbon steel high tensile grades — used in applications where standard stainless bolts are not strong enough and carbon steel would corrode. The Bumax 8.8 Stainless Steel High Tensile Hex Bolt matches Grade 8.8 strength in stainless, and the Bumax 10.9 Stainless Steel High Tensile Hex Bolt exceeds it — suited to offshore, chemical and food processing environments where both strength and corrosion resistance are non-negotiable.
Shop the full range above, or contact our team for expert advice on the right product for your application or reach out if you need a quote. Fast dispatch from our Australian warehouse.
Australian Business, Local Supply: AIMS Industrial has supplied Australian industry since 1988.
Also see our Bolts, Hex Nuts, Washers Spring Washers and Fasteners ranges.