براغي ذات رأس أسطواني مقاس 1/2-13 × 4-1/2 بوصة | محرك سداسي | حبيبات نايلون | خيط جزئي | فولاذ سبائكي مع أكسيد أسود حراري (25 / عبوة)

Installed these in a jig I’m making and the hex socket drive took the torque perfectly without stripping. The black oxide finish looks clean and seems like it’ll resist rust in the shop.

The hex socket drive seated firmly on my torque wrench with zero wobble, which was a relief after fighting with a cheap set last month. Threads cut clean into the jig block without galling, and the black oxide finish feels robust enough to hold up under repetitive use.

Used these on a fixturing plate for a milling setup and the partially threaded length gave just the right grip depth. The black oxide finish has held up fine against coolant and handling so far. Went through all 25 without a single bad thread.