M8 X 40mm 六角穴付きショルダーボルト | 六角穴頭 | 六角穴駆動 | 合金鋼 (25個/パッケージ)

The precision-ground shoulder is exactly what I needed for a bearing surface on a custom jig, and the spacing of the threads feels spot-on for a snug fit. Took a bit of elbow grease with a hex key, but once seated they hold rock-solid with zero wobble.

Needed a precise pivot for a small mechanism and the ground shoulder was spot on—no wobble. The hex drive made seating them a quick job, and all 25 arrived with clean threads. Solid value for a set this uniform.

The shoulder on these M8s is ground so smooth they slide into a bearing bore without any gritty feel, and the hex socket drive grabs the Allen key cleanly every time. Just used a few as pivot pins on a jig and they're holding up great under repeated load.