5/16-18 × 3-1/2" براغي رأس سداسي | صناعة أمريكية | فولاذ سبائكي درجة L9 مع زنك أصفر | ملولبة جزئيًا (50/عبوة)

The partially threaded shaft made all the difference for aligning a jig I was bolting down—no fighting the threads mid-assembly. These L9 alloy heads took a breaker bar without rounding off, and the yellow zinc finish stayed clean after a week of shop grime. Solid buy for the price.

Wrench slid right onto the hex head with zero play, and the partial threads grabbed cleanly in my equipment mount. For a fifty-pack of Grade L9 with that yellow zinc, this feels like a solid stock-up buy.

The yellow zinc coating on these is really nice and even, no flaking or spots. I needed partially threaded 3.5-inch bolts for a tight assembly and these threaded in smoothly.