مسامير رأس أسطوانية بمقبس سداسي 7/8-9 × 2-1/4" | محرك مقبس سداسي | حبيبات نايلون | ملولبة جزئيًا | فولاذ سبائكي مؤكسد حراريًا أسود (10 / عبوة)

The hex drive grabbed perfectly without any cam-out, and the black oxide finish has a nice, even look. Installed these into a jig fixture and they held tight with no wobble.

The partially threaded design seated these perfectly in my fixture plate without any bottoming-out hassle, and the black oxide finish handled the shop grime without a fuss. Fit was spot-on in the tap hole I’d prepped, so these are going straight into my regular stock for jig work.

The nylon pellet locking feature on these socket cap screws is a game-changer for keeping things tight on my tooling jigs. The black oxide finish looks great and seems durable. Exactly the heavy-duty fasteners I needed for this machinery project.