M8-1.25 x 25mm ソケットキャップスクリュー | フラットヘッド六角穴付き | 全ねじ | 合金鋼クラス10.9 熱処理黒色酸化仕上げ（400本/袋）

The hex socket drive bites cleanly with a standard Allen key, and the black oxide finish held up fine during assembly without leaving streaks on my gloves. For 400 pieces at this grade, the threads run smooth and consistent across the whole box, even after sorting through half of them for a jig buil

Finally, a batch of socket cap screws that are actually fully threaded to the head—these seated perfectly in my fixture without any binding. The black oxide finish feels more durable than the standard zinc I've used before.

Installed a set of these on a jig I'm building and the black oxide finish gave them a nice, uniform look once tightened. The hex socket drive seated perfectly with my driver, no slipping or stripping. Solid fasteners for the price.