M36-4 X 130mm 內六角螺絲 | 六角驅動 | 部分螺紋 | Class 12.9 合金鋼熱處理黑氧化物 (2顆/包)

Installed these in a jig for a heavy machining setup and the 12.9 grade alloy steel held up perfectly under high torque. The hex socket drive made tightening them with an Allen key feel precise.

I needed a set of heavy-duty screws for a jig I’m building, and the 130mm length plus the partially threaded design gave me exactly the grip I was after. The black oxide finish looks tough and shouldn’t rust in my shop.

The hex socket drive fit my driver perfectly with zero wobble, and the black oxide finish on the 12.9 alloy steel looks properly tough. These are exactly what my jig needed, solid and precise.