M12 flat washer in A4 stainless steel (316 marine grade) to DIN 125-A. Distributes clamping load under bolt heads and nuts, protecting timber, aluminium, and coated substrates from crushing or marking. A4 (316) resists saltwater and chloride attack for coastal, marine, and pool installations. Free next-day UK delivery on orders over £50.
  • M12 flat washer Form A marine grade 316 DIN 125-A
  • DIN 125-A Form A flat washer M12 A4 marine grade stainless steel, side profile
  • Simfix product label - 125A4130PK25-SIM
  • Simfix product label - 125A4130PK200-SIM
M12 flat washer Form A marine grade 316 DIN 125-A
DIN 125-A Form A flat washer M12 A4 marine grade stainless steel, side profile
Simfix product label - 125A4130PK25-SIM
Simfix product label - 125A4130PK200-SIM

Simfix

Flat Washer, Form A DIN 125-A A4 A4 Stainless Steel (M12)

SKU 125A4130PK25-SIM
£4.36
Pack size:
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M12 flat washer in A4 stainless steel (316 marine grade) to DIN 125-A. Distributes clamping load under bolt heads and nuts, protecting timber, aluminium, and coated substrates from crushing or marking. A4 (316) resists saltwater and chloride attack for coastal, marine, and pool installations. Free next-day UK delivery on orders over £50.
£4.36
M12 flat washer Form A marine grade 316 DIN 125-A DIN 125-A Form A flat washer M12 A4 marine grade stainless steel, side profile Simfix product label - 125A4130PK25-SIM Simfix product label - 125A4130PK200-SIM
M12 flat washer Form A marine grade 316 DIN 125-A DIN 125-A Form A flat washer M12 A4 marine grade stainless steel, side profile Simfix product label - 125A4130PK25-SIM Simfix product label - 125A4130PK200-SIM

This M12 Form A flat washer is manufactured to DIN 125-A in A4 stainless steel (316 marine grade). A4 (316) stainless steel provides resistance to chloride ion attack - the primary cause of corrosion failure in wet, coastal, and pool environments - at a level that standard A2 (304) stainless cannot reliably match. The washer distributes clamping load under the bolt head or nut face, protecting the parent surface and increasing the effective bearing area. For a fully corrosion-resistant assembly, pair with A4 bolts and A4 nuts throughout.

Typical applications

  • Marine and coastal installations - boat fittings, pier fixings, jetty hardware
  • Swimming pool surrounds, water treatment plant, and pump assemblies
  • Timber decking and fencing in wet or coastal conditions
  • Chemical plant, food processing, and washdown environments

Available in packs of 25 to 200, with free next-day UK delivery on orders over £50 and 30-day no-quibble returns.

Fastener styleForm A flat washer
StandardDIN 125-A
MaterialA4 stainless steel (316)
Property classA4-140HV
Thread sizeM12
Head typeN/A
Surface finishPlain (no plating)
HS commodity code7318220091
Recommended useMarine

RoHS and REACH compliant.

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