M12 Hex Bolts (Part Thread)

Designed to meet the demanding needs of industries such as construction, machinery, and automotive, these M12 hex bolts are a reliable choice. With a thread diameter of 12mm and a head diameter of 19mm, these bolts offer exceptional strength and durability for a wide range of applications.

12mm Hexagon Bolts for Secure Connections

Stainless steel M12 bolts DIN 931 feature a threaded section that ensures a strong and secure connection while allowing for easy assembly and disassembly. These bolts are characterised by their shank design, which enhances their load-bearing capacity and provides superior stability in demanding environments. With a variety of lengths available, you can choose the perfect size to suit your specific project requirements.

M12 Bolt Dimensions

  • Thread Diameter: 12mm
  • Thread Pitch: 1.75mm
  • Head Width/Socket Size: 19mm
  • Head Depth: 7.68mm (max)
  • Thread Length ≤125mm: 30mm (min)
  • Thread Length 125mm - ≤200mm: 36mm (min)
  • Thread Length >200mm: 49mm (min)
  • Head Type: Hexagon

Stainless Steel M12 Hex Bolts DIN 931

Our A2 stainless steel bolts are particularly popular for their excellent corrosion resistance, making them ideal for outdoor and high-moisture applications.

Browse our full range of stainless steel hex bolts DIN 931 here.

20 products


M12 Hex Bolts – Stainless Steel (DIN 931 Part Thread) | Fixabolt®

Heavy-duty fixings for jobs that don’t compromise.

Fixabolt® M12 hex bolts are engineered for strength, precision, and long-term durability. With a 12mm metric thread and a classic hex head, these bolts are perfect for structural applications where a part-threaded bolt is preferred, allowing for better load distribution and improved resistance to bending and shear.

Made to DIN 931 standards, each M12 bolt features a smooth, unthreaded shank below the head and a strong rolled thread. These are the bolts you reach for when you're fixing steel plates, structural timbers, heavy brackets, or machinery that simply can’t afford to fail.

Product Specifications:

  • Size: M12 (12mm)
  • DIN 931 (partially threaded)
  • Hex head – suitable for spanners and sockets
  • Length: From 50mm to 300mm

Every bolt is cold-forged and finished with precision, ensuring a tight fit and lasting performance in harsh environments.

Need high load capacity? M12 gives you that extra peace of mind.

Why Buy M12 Bolts from Fixabolt®?

✔ Premium stainless steel in A2 or A4 grades

✔ Ready for heavy-duty and structural applications

✔ Fast UK delivery with live stock levels

✔ Bulk order pricing available for trade buyers

✔ Clear size options, easy online ordering

Need matching M12 nuts, washers or locking options? We’ve got you covered, just view the nuts and washers collection.

Fixings that mean business. Fixings from Fixabolt®.