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Technical notes, selection guides and troubleshooting for cold heading & fastener tooling

2026-09-14

Ejector pins galling on stainless steel wire? M42 cobalt HSS (HRC 65–68) keeps KO pins running — with an M42 vs H9 vs D2 vs carbide selection table.

M42 ejector pincobalt HSS KO pinstainless steel screw toolingscrew header machinecold heading die

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2026-08-27

H9 grade ejector pins (KO pins) balance wear resistance and toughness. φ0.8–φ40 mm standard range, custom sizes to ±0.01 mm, factory direct.

H9 ejector pinscrew header machine ejector pinprecision KO pincold heading diecustom non-standard ejector pin

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