Metallurgical Selection
AISI 410 / 420 Martensitic Steel
We forge our main shanks from high-purity martensitic stainless steel (DIN 1.4021 / 1.4028). This specific alloy structure ensures ideal spring memory in the handles while guaranteeing Rockwell Hardness levels of HRC 42–48 along the body, preventing permanent deformation under heavy needle torque.



