براغي رأس أسطواني مقاس 1/4-20 × 1/8 بوصة من HOLO-KROME 06012 | محرك سداسي | فولاذ سبائكي (100 / عبوة)

I needed a jam screw that would hold tight in a blind hole, and these hex socket collars drive cleanly without stripping. Each one snaps into place over the set screw, locking it solid with zero fuss.

Finally, a jam screw that actually stays put once you torque it down. The headless design with the through hex socket made it easy to drive into tight spots on my fixture, and the alloy steel feels solid for the price.

The hex drive worked perfectly with my standard Allen key, and these jam screws held everything firmly in place without any slipping. Definitely a solid choice for locking down springs in tight spots.