براغي رأس مقبس 1/4-20 × 3/8" | محرك مقبس سداسي | رقعة نايلون | خيط كامل | فولاد سبيكة أكسيد أسود حراري (200 / عبوة)

The hex socket drive bit into my driver cleanly, and the thermal black oxide finish looks uniform across all 200 pieces. Threading them into my jig fixtures was smooth without any cross-threading fuss. These are exactly what I needed for precision assembly work.

The nylon patch on these screws holds fast even under vibration, which saved me from having to use threadlocker on a tooling fixture. The black oxide finish looks clean and hasn't flaked during installation.

Just finished a small jig build and these 1/4-20s threaded in perfectly with no binding—the nylon patch held them snug without needing lock washers. The hex socket drive made it easy to get them seated in tight spots.