براغي رأس مقبس 1/2-12 × 6-1/2" | محرك مقبس سداسي | ملولبة جزئيًا | فولاذ سبائكي معالجة حرارية سوداء أكسيد (10/عبوة)

The black oxide finish on these screws held up perfectly during my jig assembly, with no marring on the hex socket during installation. The partially threaded design made alignment much easier than fully threaded bolts I've used before.

I needed a longer hex socket screw for a jig build, and these 1/2-12 x 6-1/2" ones fit perfectly with the partially threaded design giving great grip. The black oxide coating seems tough so far, no flaking after installation.

The black oxide finish on these screws held up perfectly during assembly without any galling or residue. Thread engagement was smooth and consistent when torquing into tapped holes for a fixture base.