براغي ذات رأس أسطواني مقاس 1/4-20 × 3-1/2 بوصة | رأس مسطح مع محرك سداسي | خيط جزئي | فولاذ سبائكي مع أكسيد أسود حراري (100/عبوة)

The hex socket drive grabbed firmly with my Allen key, no stripping even when I torqued these down into a steel jig. The black oxide finish looks clean and resisted rust after a few days in a damp shop. Solid buy for precision assemblies.

The partially threaded design made lining up my jig plates a lot easier, and the black oxide finish looks sharp against the aluminum. They torqued down smoothly without any stripped heads, so I’ve got no complaints for the price.

The hex socket drive on these screws bites cleanly into my driver without any wobble, and the black oxide finish has a nice, even texture that feels solid in hand. I used them to build a small fixture for my drill press and the 3-1/2" length with the partial threading gave me just the right amount o