براغي رأس أسطوانية 7/16-14 × 7-1/4" | مقبس سداسي | خيط جزئي | فولاذ سبائكي أسود حراري (10 / عبوة)

Installed these into a new jig I'm building for repeat drilling, and the black oxide finish gave a snug, precise fit without any galling. The hex socket drive makes them easy to torque down even in tight spots.

The 7/16-14 threads bit in cleanly on my jig setup, no wobble or stripping even with a wrench torquing it down. For the length, the partial threading gives just the right grip depth, and the thermal black oxide actually feels slicker than the plain zinc ones I've used before.

The black oxide finish on these screws held up perfectly when I used them to mount a heavy fixture on my press. The partial threading made alignment a breeze, and the hex socket drive didn't strip even under high torque. Exactly what I needed for a reliable assembly.