1/4-20 x 4" ソケットキャップスクリュー | 平頭 ヘックスソケットドライブ | 部分ねじ | 合金鋼 熱処理黒色酸化被膜 (100 / パッケージ)

I needed some longer cap screws for a jig I was building, and the 4-inch length on these 1/4-20s was exactly what I was after. The hex socket drive made them easy to tighten in tight spots, and the black oxide finish feels durable and resistant to wear.

I was a bit skeptical about the partially threaded design, but it’s perfect for clamping down thick workpieces without bottoming out. The black oxide finish on these 1/4-20 screws gives them a nice, uniform look and seems durable so far in my jig. They drive cleanly and hold tight without stripping.

These flat heads sit flush in my fixture table without any wobble, which is exactly what I needed for precision assembly. The black oxide coating looks like it'll hold up well against the shop dust and oil.