5/16-18 X 7/8" براغي ذات رأس أسطواني بمقبس سداسي | محرك بمقبس سداسي منخفض الرأس | ملولبة بالكامل | سبائك فولاذية مؤكسدة حرارياً باللون الأسود (100 /

The low head profile on these is perfect for tight clearance spots on my jig fixture, and the black oxide finish hasn’t shown a speck of rust after a month in a damp shop. Fully threaded all the way down too, which made stacking washers a breeze.

The hex socket drive grabbed my Allen key securely without any stripping even on the first few turns, and the black oxide finish looks clean against my jig frame. I’ve used a dozen so far on a tooling setup and the threads cut smoothly into the tapped holes.

These screws fit perfectly in a tight clearance area on my milling jig where a standard cap screw would have stuck out. The black oxide finish seems really durable and hasn't chipped during installation.