M5 spring washer in A2 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. A2 (304 grade) gives good corrosion resistance for indoor and non-coastal outdoor use. Free next-day UK delivery on orders over £50.
  • M5 spring washer A2 stainless DIN 127-B
  • DIN 127-B spring washer M5 A2 stainless steel, side profile
  • Close-up detail - M5 A2 stainless spring washer DIN 127-B
  • Simfix product label - 127A2051PK25-SIM
  • Simfix product label - 127A2051PK200-SIM
M5 spring washer A2 stainless DIN 127-B
DIN 127-B spring washer M5 A2 stainless steel, side profile
Close-up detail - M5 A2 stainless spring washer DIN 127-B
Simfix product label - 127A2051PK25-SIM
Simfix product label - 127A2051PK200-SIM

Simfix

Rect Sect Spring Washer DIN 127-B 1 Stainless Steel (M5)

SKU 127A2051PK25-SIM
£1.91
Pack size:
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M5 spring washer in A2 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. A2 (304 grade) gives good corrosion resistance for indoor and non-coastal outdoor use. Free next-day UK delivery on orders over £50.
£1.91
M5 spring washer A2 stainless DIN 127-B DIN 127-B spring washer M5 A2 stainless steel, side profile Close-up detail - M5 A2 stainless spring washer DIN 127-B Simfix product label - 127A2051PK25-SIM Simfix product label - 127A2051PK200-SIM
M5 spring washer A2 stainless DIN 127-B DIN 127-B spring washer M5 A2 stainless steel, side profile Close-up detail - M5 A2 stainless spring washer DIN 127-B Simfix product label - 127A2051PK25-SIM Simfix product label - 127A2051PK200-SIM

This M5 rectangular section spring washer is manufactured to DIN 127-B in A2 stainless steel (304 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

  • Mechanical assemblies where vibration or dynamic loading could loosen the joint
  • Automotive, machinery, and workshop equipment fastening
  • General engineering and maintenance applications
  • Indoor and outdoor structural fixings where anti-loosening is required

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
MaterialA2 stainless steel (304)
Property classEN 1.4310
Thread sizeM5
Head typeN/A
Surface finishPlain (no plating)
HS commodity code7318210091
Recommended useWorkshop

RoHS and REACH compliant.

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