M16-2 X 110mm 內六角螺絲 | 平頭內六角驅動 | 部分螺紋 | 10.9級合金鋼熱處理黑氧化 (25顆/包)

Had to replace some old worn bolts on a press fixture, and these M16s fit perfectly with their partially threaded design making alignment way easier. The black oxide finish looks clean and the hex socket drive torqued down smoothly.

Built two jigs for a production run with these and the partial threads grabbed perfectly, no wobble even at full torque. The black oxide finish held up to coolant spray all week without a spot of rust. Honestly, these are the first fasteners I've used where I didn't have to chase any threads.

The hex socket drive seated perfectly with my Allen key, and the black oxide finish looks clean against the steel of my fixture. Threading was smooth for a partially threaded bolt—no binding at all. Solid choice for a precision assembly.