براغي رأس سداسي ثقيلة 1-1/8-7 × 5-1/2 بوصة | صناعة أمريكية | فولاذ A307 درجة B مطلي بالزنك | ملولبة جزئيًا (20/عبوة)

Used these to bolt down a heavy conveyor frame, and they seated perfectly without any thread binding. The partial threading made it easy to get full clamping force on the flanges.

The zinc plating on these has held up better than I expected for outdoor use, and the coarse threads bit into the steel nicely. A solid 5/8" drive socket fit these perfectly for torquing down a press frame.

Used one of these to mount a heavy-duty winch plate, and the threads cut smooth and seated perfectly with a wrench. The partially threaded shank made alignment much easier than a fully threaded bolt would have.