براغي رأس مقبس مقاس 9/16-18 × 6 بوصات | محرك مقبس سداسي | ملولبة جزئيًا | فولاذ سبائكي مؤكسد حراري أسود (10/عبوة)

Used these on a custom press jig I’ve been building, and the partial threading gave me just enough grip without bottoming out. The black oxide coating hasn’t shown any rust after a week in a damp shop.

The hex drive grabbed perfectly without any cam-out when I torqued them into my drill press jig. The black oxide finish looks clean and seems to resist surface rust. Worked exactly as needed for precision fixturing.

Used a full pack mounting a heavy jig plate and every one seated cleanly without stripping. The partial thread gives just the right grip depth for 6-inch reach, and the black oxide finish hasn't shown a speck of rust after a week of coolant spray.