براغي ذات رأس أسطواني 2-4-1/2 × 6 بوصة | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي مع أكسيد أسود حراري

The black oxide finish on these screws looks sharp and held up fine during assembly. I’ve got a handful left over from a tooling project, and the threads cut cleanly with a hex key every time.

Used these to rebuild a fixture at work, and the black oxide finish held up perfectly against the metal chips. The hex socket drive made installation straightforward with a standard Allen key.

These screws threaded cleanly into my jig without any binding, and the black oxide finish has held up well against shop grime. The hex socket drive made torquing them down in tight spots a lot less fiddly than I expected for this length.