براغي رأس سداسية 5/8-18 × 3-1/2 بوصة | صناعة أمريكية | فولاذ سبائكي L9 مطلي بالزنك الأصفر | ملولبة جزئيًا (25/عبوة)

The hex heads fit my socket perfectly with no rounding, which was a relief for this critical machinery repair. Yellow zinc coating looks durable and the partial threading made alignment much easier.

Used these to bolt down a 10-ton press at work, and the Grade L9 alloy took the torque without any stretch. The yellow zinc coating is holding up fine despite some oil exposure.

Installed these on a piece of heavy equipment yesterday and the hex head grabbed perfectly with a socket, no stripping. The yellow zinc finish seems durable and the partial threading made alignment in tight spots much easier than a fully threaded bolt would have.