M12-1.75 X 85mm 內六角圓頭螺絲 | 六角驅動 | 部分螺紋 | 12.9級合金鋼 熱處理黑色氧化 (50 / Pkg.)

The partially threaded design made lining up these bolts in a tight assembly much easier than I expected. They torqued down smoothly without any galling, and the black oxide coating looks clean and professional.

Used these on a jig fixture at work and the hex socket drive made tightening them in tight spots way easier than a standard bolt head. The 85mm length was spot on for what I needed, and all fifty came in the package with clean threads.

The black oxide finish on these bolts gives them a nice, non-glare look that fits right into our tooling setups. I've torqued them down in a fixture and the hex socket drive hasn't stripped once, so the Class 12.9 strength feels solid for the price.