براغي HOLO-KROME 72142 5/16-18 × 2-3/4 بوصة من نوع Socket Cap | محرك سداسي | فولاذ سبائكي مع أكسيد أسود حراري (100 / عبوة)

Finally a bolt that doesn't strip before reaching full torque—the black oxide finish held up perfectly in my press fixture. Needed a solid 5/16-18 for a custom die mount and these socket caps fit the hole exactly with no slop.

Installed these on a jig I’m building for a custom fixture, and the black oxide coating feels like it’ll resist rust well in my shop. The hex drive seated perfectly with no stripping during tightening.

Sized up my bench vise rebuild perfectly, and the 2-3/4" length gives just the right grip for the fixture plates I bolt down. The thermal black oxide coating makes them slide in smooth without any binding, though I wish the threads were a touch cleaner out of the pack. Solid for the price, and I’ve