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NFE 27-620 ~DIN 137 B 440-520 HV
  Standard withdrawn     B

BN 83727

Waved spring washers
Spring steel 440-520 HV
zinc plated with thick layer passivation
 
warnings ISO 4042
Quenched and tempered fasteners ≥ 360 HV and tempered case-hardened fasteners with electroplated coatings: Susceptible to hydrogen embrittlement!
Further notice to residual risks can be found in the introduction section.
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