5/8-11 X 4" 헤비 육각 헤드 캡 나사 | 미국 제조 | A307 B등급 강철 무도금 | 부분 나사산 (50개/팩)

Needed a robust bolt for a steel fabrication project and these 4-inchers threaded perfectly into my tapped holes without binding. The A307 grade holds up well under load without any twisting on the torque wrench. Exactly what I look for in a heavy hex cap screw.

Tapped these into a heavy-duty machinery mount and the threads caught cleanly without any binding. The A307 Grade B steel feels solid and the partial threading made alignment easier than I expected.

Used these to secure a workbench frame and the threads were clean and consistent, no fighting to start a nut. The partial threading gives just the right grip depth without bottoming out. Solid 5/8-inch heft that inspires confidence for heavy loads.