براغي كتف مقبس HOLO-KROME 08060 3/8" × 3-1/4" | رأس مقبس | محرك مقبس | فولاد سبائكي مع أكسيد أسود حراري (25 / عبوة)

The ground shoulder on these is machined perfectly true – my pivot arm spins without any wobble now. The black oxide finish also resisted scratches during installation. Overall exactly what I needed for a precise mechanical assembly.

The precision-ground shoulder on these screws made aligning my homemade hinge assembly much easier than with standard bolts, and the black oxide finish looks great. They're solidly built and drove in smoothly without any wobble.

The shoulder is ground so precisely that it fits my jig's bore with zero play, which is exactly what I needed for a smooth pivot. I've used cheaper shoulder screws before that wobbled, but these are rock solid and the black oxide finish looks clean.