HOLO-KROME 08018 5/16" X 1/2" ソケットショルダースクリュー | ソケットヘッド | ソケットドライブ | 合金鋼 熱処理黒色酸化 (25 / パッケージ)

The precision ground shoulder is exactly what I needed for a bearing surface on my project—it’s dead on spec and the black oxide finish looks sharp. Fit was snug in the bore without any wobble, and all 25 came uniform.

Used them as a pivot pin for a custom jig and the precision ground shoulder fit the bore perfectly with zero slop. The black oxide finish looks sharp and should resist rust well in my shop. Packaging had all 25 accounted for, no complaints.

The hex socket drive made tightening these in tight spots a breeze, and the precision ground shoulder slid into my bearing setup with zero play. They’ve got a solid, dark finish that’s held up without a scratch so far. Exactly what I needed for a clean pivot.