316/A4 Stainless Metric Hex Cap Screws / Bolts

316 Stainless Steel (A4) DIN 933 Metric Hex Head Bolts

When you need a strong, corrosion resistant fastener that can be installed with standard tools, DIN 933 hex head bolts are the global metric standard. These fasteners feature a full height hex head and full length machine threads, making them ideal for structural, mechanical, and marine fastening applications.

Our metric hex bolts are fully threaded fasteners designed to be used in tapped holes or with nuts in high strength assemblies.

Our DIN 933 hex head bolts are manufactured from A4 grade 316 stainless steel, making them ideal for saltwater, coastal, and washdown environments where corrosion resistance is critical.

The hex head design allows for high torque installation using standard wrenches or sockets, making these bolts well suited for demanding applications such as:

• Marine hardware and deck fittings
• Boatbuilding and refits
• Dock and marina construction
• Machinery and mechanical assemblies
• Automotive and trailer hardware
• Structural steel and aluminum assemblies

The full length threading provides strong engagement in both tapped holes and nut based joints.

Why DIN 933 Matters

DIN 933 defines the thread form, head dimensions, and overall geometry so that these hex bolts fit and perform consistently across all sizes. These are not generic hex bolts. They are precision metric hex bolts designed for accurate fit with metric nuts, washers, and threaded holes.

Using true DIN 933 hardware ensures proper load distribution, reliable torque values, and consistent joint strength.

Material: A4 / 316 Stainless Steel

These bolts are made from A4 stainless steel, also known as 316, the preferred alloy for corrosive and saltwater environments.

• Exceptional resistance to rust and pitting
• Highly resistant to saltwater and chlorides
• Strong and durable under load
• Long service life outdoors and in wet environments
• Non-magnetic in most conditions

This is the same stainless used in marine fittings, fasteners, and offshore hardware, and it far outperforms A2 stainless in coastal exposure.

When paired with our A4 stainless metric hardware, these hex head machine bolts provide a corrosion resistant fastening system that delivers strength, reliability, and long term performance in demanding environments.