1-3/8-6 X 14" 六角凹頭螺絲 | 六角驅動 | 部分螺紋 | 合金鋼熱處理黑色氧化物

Used these to repair a jig on a production line and the black oxide finish held up well against the cutting fluid. The 14-inch length was exactly what we needed for the through-hole application.

Needed these for a fixture build and the hex socket drive made installation really smooth even in tight spots. The partially threaded length allowed me to pull parts together perfectly. Only wish the pack had one more screw.

The black oxide finish on these screws looks flawless and held up perfectly during assembly, no chipping or oil residue. The hex socket drive seated cleanly on my Allen key, and the partial threading made aligning the 14-inch length into my fixture a breeze.