براغي رأس كبس 5/16-18 × 1 بوصة | محرك سداسي منخفض الرأس | ملولب بالكامل | فولاذ سبائكي مؤكسد أسود حراري (200 / عبوة)

These low head screws fit perfectly into tight clearance spots where standard bolts wouldn't work, and the thermal black oxide coating seems very durable. Installed a whole batch in a jig fixture and didn't have a single stripped socket.

The black oxide finish on these screws held up perfectly during assembly, no galling or binding in my jig fixture. Exactly the grip depth I needed for aluminum tooling plates.

Used a full pack rebuilding some custom tooling jigs, and the black oxide finish held up perfectly against light oil and chips. The hex socket drive grabbed tight with no stripping, even at higher torque. Exactly the consistent length and thread quality I needed for repeatable setups.