براغي هولوكروم 72242 ذات رأس أسطواني مقاس 1/2-13 × 3 بوصة | محرك سداسي | فولاذ سبائكي مؤكسد حراريًا أسود (25 / عبوة)

The black oxide finish looks sharp and seems durable, and the hex socket drive seated perfectly with my Allen key without any stripping. These have been holding firm in a precision fixture I’ve been tweaking all week, so the alloy steel quality is obvious.

Installed these in a jig for a production run and the hex socket drive held up perfectly under repeated torque. The 3-inch length was exactly what I needed for clamping thick workpieces without bottoming out.

The black oxide finish on these screws really resists marring when I’m torquing them down in jig fixtures, and the socket drive makes it easy to get them snug without stripping. They fit perfectly in the pre‑tapped holes on my tooling plate. Exactly what my shop needed for heavy use.