M12-1.75 X 22mm 소켓 캡 나사 | 접시 머리 육각 소켓 드라이브 | 풀 나사산 | 12.9급 합금강 아연 도금 (100개/팩)

I put these in a jig for a production run and they held up perfectly under constant tightening—the zinc plating still looks good with no corrosion. The Class 12.9 alloy steel feels substantially harder than standard grade bolts I've used before.

The hex socket drive seated the Allen key perfectly without any wobble, which made tightening them into my jig frame a breeze. At 22mm, they’re just the right length for a flush grip on the fixture plate. Can’t complain for the price, though the zinc finish is starting to dull after a few weeks of u

I was a bit worried about the thread quality on these, but they seated perfectly into my jig with zero binding. The hex socket drive grips the Allen key firmly, and the 12.9 alloy steel feels seriously tough—these will handle the load on my fixture without a second thought.