M4-0.7 X 22mm 소켓 머리 볼트 | 육각 소켓 드라이브 | 전체 나사산 | 클래스 12.9 합금강 아연 도금 (600개/팩)

The hex socket drive seated perfectly on my Allen key, and the zinc plating looks uniform across all 600 pieces. These 12.9 alloy steel screws feel rock solid for jig work, and the fully threaded 22mm length is right on spec.

Needed a full box of these for a tooling fixture and these M4s are dead consistent across every single piece. The hex drive bites clean and the 12.9 alloy steel handles torque without stripping, so the whole batch feels solid. Zinc plating is even and should hold up fine on the shop floor.

Just finished a jig for a precision assembly and every single one of these 600 screws seated cleanly in the tapped holes, the Class 12.9 alloy steel is rock solid and the zinc plating held up without a single chip.