براغي رأس سداسية 9/16-18 × 3-1/2 بوصة | صناعة أمريكية | درجة L9 سبيكة فولاذ زنك أصفر | ملولبة جزئياً (25/عبوة)

These bolts fit perfectly in a blind hole assembly where I needed full thread engagement on the nut side, and the partially threaded shank made alignment a lot easier. The yellow zinc coating seems like it'll hold up well in a damp shop environment.

I needed a set of high-strength bolts for a heavy equipment repair, and these grade L9s handled the torque without a hint of stretch. The yellow zinc finish looks good and should resist corrosion well in my workshop.

The partial threading on these 9/16-18 cap screws made installing them into a tight machinery flange much easier than a fully threaded bolt would have. The yellow zinc finish looks clean and hasn't shown any rust after a few weeks on the job.