5/16-18 x 1-3/8인치 육각 머리 볼트 | 5등급 강철 황색 아연 도금 | 부분 나사산 (200개/팩)

Used these to replace rusted bolts on my tractor’s mower deck—the yellow zinc coating is already holding up better than the old ones did. The partially threaded design made installation quick without stripping.

The hex heads fit my socket set perfectly, and the yellow zinc coating on these grade 5 bolts looks like it will hold up well in my shop. Used them to fasten a steel bracket on a trailer hitch—threads caught cleanly and the partial threading made alignment easy.

Needed these for a jig I was building and the partial thread is exactly what I wanted, so the unthreaded shank sits clean in the fixture. The yellow zinc finish looks uniform across all 200, no stripped heads on the first dozen I’ve torqued down.