M6-1 x 15mm 소켓 캡 나사 | 버튼 헤드 육각 소켓 드라이브 | 전체 나사산 | 12.9급 합금강 열처리 블랙 옥사이드 (600 / 팩)

Needed a batch of fully threaded M6-1 cap screws for a jig I was building, and these 12.9 alloy steel ones are way tougher than the usual hardware store stuff. The thermal black oxide finish seems to resist a bit of oil and grime on the workshop bench, which is a nice bonus for the price.

The black oxide finish looks properly done and the hex sockets are clean-cut, no stripped edges on any of the 600 I sorted through. For jig-building and fixture work, these M6-1s hold torque well and the thread engagement feels precise. Solid buy for the price per piece.

Had to replace some worn hardware on a jig I use daily and these black oxide screws are tougher than the originals. The hex socket drive made them easy to seat and they haven't budged under vibration.