1-3/8-6 X 9" 소켓 캡 나사 | 육각 소켓 드라이브 | 부분 나사산 | 합금강 열처리 블랙 옥사이드

The black oxide finish on these socket cap screws really helps them resist rust in my shop environment. Had to swap out some standard bolts on my press tooling and these threaded in smooth and tight. For 9-inch partially threaded screws, the hex drive held up perfectly under my torque wrench without

Installed these in a heavy jig I’m building, and the 9” length gave me just enough thread engagement without bottoming out. The thermal black oxide finish feels smooth and hasn’t shown any rust after a week in the shop.

The hex socket drive grips the Allen key perfectly, no slippage even under heavy torque on my jig setup, and the black oxide finish already shows it'll resist rust well. These 9-inch long screws are exactly what I needed for a deep fixture assembly, and the partially threaded portion lets me clamp p