براغي رأس مقبس 1-8 × 4 بوصة | محرك مقبس سداسي | كرة نايلون | خيط جزئي | فولاذ سبائكي أسود حراري (10/عبوة)

Got these for a custom fixture at work and the black oxide finish is holding up great, no rust after a week of coolant exposure. The nylon pellet locks the threads tight enough that I didn't need any threadlocker.

The hex drive grips the Allen key perfectly, and the black oxide finish looks professional on my jig setup. These 4-inch screws fit my tooling fixture exactly right.

The partially threaded design on these 1-8 x 4" screws made aligning them in my jig much easier than fully threaded bolts. The black oxide finish looks clean and seems durable, and the hex socket drive engaged perfectly with my Allen key. Exactly what I needed for a tooling fixture.