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.
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.