براغي رأس سداسي مقاس 5/16-18 × 1-7/8 بوصة، درجة 5 فولاذ زنك أصفر، ملولبة جزئياً (100/عبوة)

Used these for mounting a gearbox to a frame, and the grade 5 steel held up without any stripping under a decent amount of torque. The yellow zinc finish looks clean and hasn't shown any rust after a few weeks in a slightly damp shop.

These bolts fit perfectly into the bracket assembly I was working on, and the partial threading made alignment much easier than a fully threaded screw would have. The yellow zinc coating looks solid too, no chips after torquing them down with a socket.

I needed a handful for a repair on my trailer hitch and the partial thread let me get a solid bite without bottoming out. The yellow zinc coating looks tough and the hex head grabbed perfectly with my socket.