M20-2.5 X 80mm 內六角螺絲 | 平頭內六角驅動 | 部分螺紋 | 10.9級合金鋼 熱處理黑氧化物 (25 / Pkg.)

I needed these for a jig fixture in my shop, and the partially threaded design let me get consistent clamping force without binding. The Class 10.9 alloy steel feels solid and the hex drive seated easily with a standard Allen key.

The black oxide finish looks sharp and seems tough enough for my jig builds—the hex socket drive seated perfectly with my Allen key. Threads were clean out of the pack, and the 10.9 rating gives me confidence for heavier loads.

I needed hardened bolts for a machine jig build and these 10.9 alloy screws handled the torque perfectly. The hex socket drive made tightening them in a tight spot much easier than a regular hex head. Nice finish on the black oxide too, no rough edges.