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We recommend DIN 128 A (curved spring lock washers) for new construction: BN 768 / BN 769 / BN 770. Spring lock washers for UNC, UNF, and Ww thread: BN 767. Other coatings on request.
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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 on our web page: Notes on use