1/2-13 X 3" 六角頭螺絲 | 美國製造 | L9合金鋼黃鋅 | 半牙 (50個/包)

Driving these into a heavy steel bracket was noticeably easier than with lesser bolts—the L9 alloy holds the threads cleanly without galling. The yellow zinc finish looks solid and the partial threading gives just the right grip depth for my jig fixture.

These are the first L9s I've bought for heavy equipment repairs, and the yellow zinc finish has held up way better than plain steel under grime. The partial threads make alignment on the flange much easier, and all 50 in the package came out of the box with clean, square shoulders.

The hex head grips my impact socket perfectly, no wobbling at all. These Grade L9 bolts feel extremely solid for heavy-duty equipment assembly, and the yellow zinc coating looks clean and professional.