M8 Hex Bolts Stainless Steel

These M8 hex bolts DIN 931 are engineered for diverse applications across multiple industries such as construction, automotive, and machinery. With an 8mm thread diameter and a 13mm hex head, these M8 hex bolts ensure reliable strength and lasting durability, making them ideal for demanding tasks.

Download M8 Hex Bolt specification sheet

Stainless Steel M8 Bolts Hexagon DIN 931

DIN 931 M8 bolts in stainless steel are designed with a partially threaded shank, which enhances both stability. The unthreaded section increases the bolt's load-bearing capacity, making them a perfect fit for projects requiring high strength. A2 stainless steel is a great choice for outdoor projects that could be exposed to moisture. Stainless steel M8 hex bolts are available in a variety of lengths, so you can find the right size to match your specific needs.

M8 Bolt Sizes:

  • Thread Diameter: 8mm
  • Thread Pitch: 1.25mm
  • Head Width/Socket Size: 13mm
  • Head Depth: 5.18mm (min) - 5.5mm (max)
  • Thread Length ≤125mm: 22mm (min)
  • Thread Length 125mm - ≤200mm: 28mm
  • Thread Length >200mm: 41mm
  • Head Type: Hexagon

You can shop our full range of stainless steel hex bolts DIN 931 here.

M8 Hex Bolts – Stainless Steel DIN 931 Part Threaded Bolts

Tough, reliable, and built for structural work.

Our M8 stainless steel hex bolts are the go-to fixing for builders, engineers, and tradespeople who need strength and consistency in every job. Manufactured to DIN 931, these bolts are partially threaded, making them ideal for through-bolting and clamping applications where shear strength matters.

Whether you're securing timber, steel, or structural brackets, these 8mm hex bolts offer a solid connection and are easy to install with a spanner or socket.

Sizes: M8 (8mm)

Length: From 50mm to 260mm

DIN 931 (part-threaded)

Hex head – tighten with spanner or socket

Each bolt comes with a clean, rolled thread and machined shank for a precise fit—perfect for structural joins, outdoor installations, and heavy-duty fixings.

Where M8 Hex Bolts Are Commonly Used


If you're using an unthreaded hole and need a bolt that won’t flex or shear, M8 part-threaded bolts are what you need.

Why Buy M8 Hex Bolts from Fixabolt®?

âś” A2 Stainless steel

✔ Tracked UK delivery — fast and reliable

âś” Quantity discounts available for trade buyers

âś” No-hassle service trusted by UK professionals

âś” Always in stock, always on spec

Need matching M8 hex nuts or washers? Add them from the same page and complete your fixing kit in one go.

Fixings that hold firm. Fixings that last. That’s Fixabolt®.