M8-1.25 X 45mm 內六角螺絲 | 圓頭內六角驅動 | 全牙 | 12.9級合金鋼熱處理黑氧化 (200顆/包)

Put them into an indexing head assembly, and the black oxide finish held up nicely against the cutting oil. The hex socket drove cleanly without stripping, and all 200 screws had consistent threads.

Bought these for a jig I’ve been building, and the black oxide finish is still perfect after a week of use. The hex socket drive fits my Allen key snug with zero wobble, and the whole pack of 200 came threaded cleanly.

Needed a batch of 12.9-grade hardware for a fixture build, and these button heads drove in cleanly without any cam-out. The black oxide finish looks nice and should resist light corrosion on the shop floor.