براغي ذات غطاء مقبس 2-4-1/2 × 8 بوصة | محرك مقبس سداسي | ملولبة جزئيًا | فولاذ سبيكة أكسيد أسود حراري

I used these to secure the base plate on a press jig, and the partially threaded shank let me get a clean clamp without bottoming out. The black oxide finish also seems tough enough to resist the shop grime.

The hex socket drive grips the allen key without any slip, even when I torqued these down on a jig fixture. The black oxide finish also held up well against light shop grime. Exactly what I needed for the precision assembly.

The partially threaded shank made aligning these in a tight fixture much easier than expected, and the black oxide finish looks professional. I’ve already ordered another set for a different project.