M12 spring washer in A4 stainless steel to DIN 127-B. Exerts continuous axial spring load on the nut face once tightened, resisting loosening under vibration and dynamic loading without thread locking compound. 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 spring washer marine grade 316 DIN 127-B
  • DIN 127-B spring washer M12 A4 marine grade stainless steel, side profile
  • Close-up detail - M12 A4 stainless spring washer DIN 127-B
  • Simfix product label - 127A4122PK25-SIM
  • Simfix product label - 127A4122PK200-SIM
M12 spring washer marine grade 316 DIN 127-B
DIN 127-B spring washer M12 A4 marine grade stainless steel, side profile
Close-up detail - M12 A4 stainless spring washer DIN 127-B
Simfix product label - 127A4122PK25-SIM
Simfix product label - 127A4122PK200-SIM

Simfix

Rect Sect Spring Washer DIN 127-B A4 A4 Stainless Steel (M12)

SKU 127A4122PK25-SIM
£3.60
Pack size:
Free next-day delivery over £50 Next-day delivery is free when your order is over £50, or £3.95 below that threshold.
Same-day shipping before 4pm Orders placed before 4pm Monday-Friday are typically dispatched the same working day.
Secure SSL checkout Checkout is encrypted and supports secure Shopify payment options.
Speedy refunds If something is not right, contact us within 30 days of delivery and we will sort a refund or replacement quickly.

M12 spring washer in A4 stainless steel to DIN 127-B. Exerts continuous axial spring load on the nut face once tightened, resisting loosening under vibration and dynamic loading without thread locking compound. 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.
£3.60
M12 spring washer marine grade 316 DIN 127-B DIN 127-B spring washer M12 A4 marine grade stainless steel, side profile Close-up detail - M12 A4 stainless spring washer DIN 127-B Simfix product label - 127A4122PK25-SIM Simfix product label - 127A4122PK200-SIM
M12 spring washer marine grade 316 DIN 127-B DIN 127-B spring washer M12 A4 marine grade stainless steel, side profile Close-up detail - M12 A4 stainless spring washer DIN 127-B Simfix product label - 127A4122PK25-SIM Simfix product label - 127A4122PK200-SIM

This M12 rectangular section spring washer is manufactured to DIN 127-B in A4 stainless steel (316 marine grade). DIN 127-B specifies a split, helical spring washer with a rectangular cross-section. Placed under the nut or bolt head before tightening, the compressed spring section exerts a continuous axial spring force on the nut face once the joint is made. This spring tension resists the nut backing off under vibration, thermal cycling, and dynamic loading - providing reliable anti-loosening performance without chemical thread locking compound. A simple, re-usable solution for general mechanical assemblies where prevailing-torque locknuts are not required.

Typical applications

  • Marine and coastal assemblies requiring vibration resistance
  • Boat deck hardware, pontoon fixings, and marina structures
  • Swimming pool plant, water treatment, and washdown areas
  • Offshore and saltwater environments where A2 is insufficient

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

Fastener styleRectangular section spring washer
StandardDIN 127-B
MaterialA4 stainless steel (316)
Property classA4
Thread sizeM12
Head typeN/A
Surface finishPlain (no plating)
HS commodity code7318210091
Recommended useMarine

RoHS and REACH compliant.

Customers also bought

    • Free next-day delivery over £50

    • Orders Before 4pm Ship Today

    • Secure SSL Checkout

    • No-Return Refunds