M12-1.75 x 50mm ソケットキャップスクリュー | フラットヘッッド ヘッスソケットドライブ | 全ネジ | クラス10.9 アロイ鋼 ジンクメッキ (100個/袋)

Had to order these for a heavy-duty jig I was building, and the 10.9 alloy steel is noticeably tougher than standard hardware store bolts. The hex drive seated perfectly without any stripping. Exactly what precision work calls for.

Used them on a custom tooling fixture and the 10.9 alloy steel held up through a full shift without a single stripped head. The zinc plating looks clean and the flat heads sit flush just like I needed. Came in a sturdy box of 100, which is exactly what a shop like mine goes through.

Installed a full set of these on a jig fixture and every single one threaded in perfectly without any binding. The zinc plating looks consistent, no burrs on the threads, and the flat heads sit flush just as needed for precision work.