براغي آلة 5/16-18 × 1-1/2 بوصة | رأس دائري مشقوق | فولاذ عادي (200/عبوة)

These are my go-to for jigs and shop fixtures; the round head seats nicely in a countersink without slipping. Having a full box means I don't have to stop mid-project to run out for more.

Finally found a bulk pack of 5/16-18 round heads that doesn't skimp on thread depth—these seated flush in my steel brackets with zero stripping. The plain finish is exactly what I needed for a dry workshop shelf, and the slotted drive took a standard screwdriver without cam-out. Two hundred of them

I needed 5/16-18 bolts for a workbench jig, and these 1.5-inch machine screws threaded perfectly into my pre-tapped holes without any binding. The plain steel finish feels solid and should hold up fine indoors.