Simfix

M12 X 80 Hexagon Head Bolt 10 Pack DIN 931 A2-70 A2 Stainless Steel

SKU 931A21208070-D
In stock
£5.95
Grade
A2 (304)A4 (316)
Pack size:
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M12 x 80mm part-threaded hex bolt in A2 stainless steel, manufactured to DIN 931 at property class A2-70. The plain shank reduces stress concentration at the thread run-out, suited to shear-loaded joints and structural through-bolting. A2 (304 grade) gives good corrosion resistance for indoor and non-coastal outdoor use. Free next-day UK delivery on orders over £50.
£5.95

M12 x 80mm part-threaded hex bolt in A2 stainless steel, manufactured to DIN 931 at property class A2-70. The plain shank reduces stress concentration at the thread run-out, suited to shear-loaded joints and structural through-bolting. A2 (304 grade) gives good corrosion resistance for indoor and non-coastal outdoor use. Free next-day UK delivery on orders over £50.
  • M12 x 80mm hex bolt A2 stainless DIN 931 - partial thread
  • DIN 931 hex bolt M12 x 80mm A2-70 A2 stainless steel, side profile
  • Hexagon head detail - M12 x 80mm A2 stainless bolt, partial thread DIN 931
  • Hexagon Head Bolt in a real-life workshop application. A smooth grip section supports secure through-bolted assemblies.
  • Simfix product label - 931A21208070-D
  • Simfix product label - 931A21208070-T
M12 x 80mm hex bolt A2 stainless DIN 931 - partial thread
DIN 931 hex bolt M12 x 80mm A2-70 A2 stainless steel, side profile
Hexagon head detail - M12 x 80mm A2 stainless bolt, partial thread DIN 931
Hexagon Head Bolt in a real-life workshop application. A smooth grip section supports secure through-bolted assemblies.
Simfix product label - 931A21208070-D
Simfix product label - 931A21208070-T
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M12 x 80mm hex bolt A2 stainless DIN 931 - partial thread DIN 931 hex bolt M12 x 80mm A2-70 A2 stainless steel, side profile Hexagon head detail - M12 x 80mm A2 stainless bolt, partial thread DIN 931 Hexagon Head Bolt in a real-life workshop application. A smooth grip section supports secure through-bolted assemblies. Simfix product label - 931A21208070-D Simfix product label - 931A21208070-T
M12 x 80mm hex bolt A2 stainless DIN 931 - partial thread DIN 931 hex bolt M12 x 80mm A2-70 A2 stainless steel, side profile Hexagon head detail - M12 x 80mm A2 stainless bolt, partial thread DIN 931 Hexagon Head Bolt in a real-life workshop application. A smooth grip section supports secure through-bolted assemblies. Simfix product label - 931A21208070-D Simfix product label - 931A21208070-T

Complete the fixing

Matching nuts and washers in the same size, grade and thread as this bolt.

M12 X 80 Hexagon Head Bolt DIN 931 A2-70 A2 Stainless Steel

M12 hexagon nut A2 stainless DIN 934 M12 Hexagon Full Nut DIN 934 A2 Stainless Steel

M12 nyloc nut A2 stainless DIN 985 M12 Nylon Insert Nut DIN 985 A2 Stainless Steel

M12 flat washer Form A A2 stainless DIN 125-A M12 Flat Washer, Form A DIN 125-A A2 Stainless Steel

Total for selected

This M12 x 80mm hex bolt is manufactured to DIN 931 in A2 stainless steel (304 grade). DIN 931 specifies a part-threaded shank: the unthreaded plain section under the head spans the thickness of the joined parts, reducing stress concentration at the thread run-out and improving shear resistance compared with a fully threaded bolt. Property class A2-70 specifies a minimum tensile strength of 700 MPa - appropriate for structural connections and high-clamping-force applications. Pair with a matching M12 hex nut (DIN 934) or nyloc nut (DIN 985) for a complete through-bolted assembly.

Typical applications

  • Structural and heavy-duty mechanical connections requiring part-threaded shank
  • Steel-to-steel and steel-to-timber fixing in engineering assemblies
  • Guard rails, racking systems, and industrial fabrication
  • General mechanical and construction applications where A2 corrosion resistance is appropriate

Available in packs of 10 to 50, with free next-day UK delivery on orders over £50 and 30-day returns.

*Photos, diagrams and other images are for illustration only and may not show the exact item supplied. Simfix reserves the right to alter or replace any photo, diagram or image at any time at its sole discretion.

**Orders that cannot be split will be rounded up to the next full pack or box quantity.

Simfix reserves the right to change quantities, stock levels and prices at any time. We accept no liability for the accuracy of dimensional data, DIN/ISO references, technical data, customs tariff codes or EAN barcodes.

Fastener styleHexagon head bolt, part threaded
StandardDIN 931
MaterialA2 stainless steel (304)
Property classA2-70
Thread sizeM12
Thread pitch1.75 mm (coarse)
Length80 mm
Head typeHex
Drive typeExternal hex (spanner)
Surface finishPlain (no plating)
HS commodity code7318157590
Recommended useWorkshop

RoHS and REACH compliant.

How do I choose between A2 and A4 stainless steel?

A2 (304) stainless steel suits most indoor, outdoor and workshop jobs. Choose A4 (316) marine grade for coastal, marine, poolside or other chloride-rich environments.

How do I make sure I order the right size?

Check the size in the product title and the standard, material and dimensions in the Product Specification tab. In M8 x 30, M8 is the thread diameter and 30 is the length in millimetres. See our size guide if you need more help.

When will my order arrive?

Orders placed before 3:30pm Monday-Friday are typically dispatched the same working day and every order is tracked. Next-day delivery is free over £50, or £5.50 below that threshold. Full options are shown at checkout.

What if I order the wrong item?

Email contact@simfix.com within 30 days of delivery with your order number. We will help arrange a refund or replacement. See our refunds information for the full process.

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Yes. Checkout is protected by SSL encryption and payments are processed through Shopify's secure checkout and supported payment providers. Simfix does not store your full card details.

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