1/2-13 x 2-1/4" 平頭內六角止付螺絲 | 合金鋼 (50個/包)

These set screws bit into the shaft nicely without any slipping, and the hex drive held up well under the torque I applied. The 50-pack is great value for a common size I use often.

The flat point tip held perfectly in the jig's set screw hole without any slipping. At 2-1/4 inches, these were exactly the right length for my milling fixture adjustment. Solid buy for the price.

I used these to secure a fixture on a milling machine, and the hex socket drive made it easy to tighten with a ball-end Allen key in a cramped spot. All 50 screws had clean threads and consistent length. Only complaint is the package didn’t include a wrench, but that’s standard for bulk packs.