براغي رأس كوبية 1-3/4-5 × 4-1/2" | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي مع أسود حراري

Used a full pack of these on a custom jig for a production run and every single one seated cleanly in the tapped holes without a single stripped thread. The black oxide finish held up nicely against the cutting fluid and gave them a solid, non-glare look. Exactly what I needed for precision assembli

I was worried the black oxide finish would rub off during assembly, but these screws held up perfectly in my fixture without any marring. The hex socket drive made installation quick with a standard Allen wrench.

Installed a set of these in a jig I’m building, and the hex socket drive grabbed the driver tip solidly without cam-out. The full threading gave me a strong, clean hold through the 4-1/2" length, perfect for the precision assembly I needed.