براغي رأس مقبس 7/8-9 × 4" | محرك مقبس سداسي | كرة نايلون | ملولبة جزئيًا | فولاذ سبائكي أكسيد أسود حراري (10 / عبوة)

The thermal black oxide finish on these looks sharp and held up fine during assembly, no chips or smears. The hex socket drive seated perfectly with my Allen key, and the partial threads gripped the work piece exactly where I needed them. For a ten-pack of 4-inch alloy steel caps, the price is a ste

Finally got around to swapping out the old hardware on my drill press jig—these screws seated perfectly with a hex key and the black oxide finish looks great. The nylon pellet really helped lock them in place without any thread locker.

Used them to secure a fixture plate on my milling setup, and the nylon pellet really holds tight under vibration. The thermal black oxide also gives them a clean, uniform finish that resists rust better than I expected.