براغي رأس أسطوانية 5/16-24 × 2 بوصة | محرك سداسي | رقعة نايلون | ملولبة جزئيًا | سبائك فولاذية بأكسيد حراري أسود (100/عبوة)

The nylon patch is a lifesaver—these hold their torque even after a few rounds of adjustments on my jigs. The black oxide finish looks consistent across all 100 pieces, no duds in the batch. Exactly what I needed for precision assemblies.

I've been using these for jig setup on my mill, and the nylon patch works really well—no loosening after heavy vibration. The black oxide finish gives them a solid, professional look that matches my tooling perfectly.

The nylon patch on these is a nice touch—they held snug in the jig I’m building without any extra thread locker. The black oxide finish looks consistent across all 100, and the partially threaded design made alignment in the fixture a breeze.