براغي غطاء مقبس M12-1.75 × 20 مم | محرك سداسي المقبس | ملولبة بالكامل | فولاذ سبائكي فئة 12.9 مع أسود حراري مؤكسد (100 / عبوة)

Installed these on a custom jig for a milling fixture I'm building, and the hex socket drive made tightening them a breeze. The 12.9 alloy steel feels noticeably sturdier than standard 10.9s. Only wish the 20mm length came with a slightly taller head, but they fit the counterbored holes perfectly.

The black oxide finish looks properly done—no patchy spots, and they threaded into my tooling plates without any binding. For the price of a hundred, these class 12.9s are a solid deal for precision assemblies.

Installed these in a jig I’m building, and the black oxide finish held up to clamping pressure without any flaking. The hex socket drive made seating them in tight spots much easier than a standard allen bolt.