M12 x 100mm part-threaded hex bolt in A4 stainless steel, manufactured to DIN 931 at property class A4-70. The plain shank reduces stress concentration at the thread run-out, suited to shear-loaded joints and structural through-bolting. A4 (316) marine grade gives outstanding resistance to saltwater and chloride corrosion - the right choice for coastal, marine, and pool environments. Free next-day UK delivery on orders over £50.
  • M12 x 100mm hex bolt marine grade 316 DIN 931 - partial thread
  • DIN 931 hex bolt M12 x 100mm A4-70 A4 marine grade stainless steel, side profile
  • Hexagon head detail - M12 x 100mm A4 stainless bolt, partial thread DIN 931
  • Simfix product label - 931A41210070PK10-SIM
  • Simfix product label - 931A41210070PK50-SIM
M12 x 100mm hex bolt marine grade 316 DIN 931 - partial thread
DIN 931 hex bolt M12 x 100mm A4-70 A4 marine grade stainless steel, side profile
Hexagon head detail - M12 x 100mm A4 stainless bolt, partial thread DIN 931
Simfix product label - 931A41210070PK10-SIM
Simfix product label - 931A41210070PK50-SIM

Simfix

Hexagon Head Bolt DIN 931 A4-70 A4 Stainless Steel (M12 X 100)

SKU 931A41210070PK10-SIM
£19.88
Pack size:
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M12 x 100mm part-threaded hex bolt in A4 stainless steel, manufactured to DIN 931 at property class A4-70. The plain shank reduces stress concentration at the thread run-out, suited to shear-loaded joints and structural through-bolting. A4 (316) marine grade gives outstanding resistance to saltwater and chloride corrosion - the right choice for coastal, marine, and pool environments. Free next-day UK delivery on orders over £50.
£19.88
M12 x 100mm hex bolt marine grade 316 DIN 931 - partial thread DIN 931 hex bolt M12 x 100mm A4-70 A4 marine grade stainless steel, side profile Hexagon head detail - M12 x 100mm A4 stainless bolt, partial thread DIN 931 Simfix product label - 931A41210070PK10-SIM Simfix product label - 931A41210070PK50-SIM
M12 x 100mm hex bolt marine grade 316 DIN 931 - partial thread DIN 931 hex bolt M12 x 100mm A4-70 A4 marine grade stainless steel, side profile Hexagon head detail - M12 x 100mm A4 stainless bolt, partial thread DIN 931 Simfix product label - 931A41210070PK10-SIM Simfix product label - 931A41210070PK50-SIM

This M12 x 100mm hex bolt is manufactured to DIN 931 in A4 stainless steel (316 marine 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 A4-70 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

  • Marine and coastal structures - jetties, pontoons, boat fixings
  • Swimming pool plant, water treatment facilities, and pump housings
  • Offshore and saltwater environments with prolonged wet exposure
  • Chemical plant, food processing, and washdown environments

Available in packs of 10 to 50, with free next-day UK delivery on orders over £50 and 30-day no-quibble returns.

Fastener styleHexagon head bolt, part threaded
StandardDIN 931
MaterialA4 stainless steel (316)
Property classA4-70
Thread sizeM12
Thread pitch1.75 mm (coarse)
Length100 mm
Head typeHex
Drive typeExternal hex (spanner)
Surface finishPlain (no plating)
HS commodity code7318157590
Recommended useMarine

RoHS and REACH compliant.

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