Fastener Guides

A SEMS screw is a screw or bolt with a washer permanently captured under the head. Fleet shops lose time when that washer is treated as optional hardware. Here is how to identify, stock, and replace it correctly.

U-bolts look simple. Four dimensions, two bend styles, and a re-torque step most shops skip make them one of the easiest fasteners to get wrong. Here's how to pick the right one — and install it so it stays put.

Well nuts are a rubber fastener that expands in a drilled hole to grip from behind — no access to the back required. Here's how they work, where they belong, and where a rivet nut is the better call.

Push nuts snap onto unthreaded studs in seconds — no tools, no torque spec, no wrench. But they are not a substitute for threaded nuts, and putting them in the wrong application creates problems that are harder to fix than the time you saved during installation. Here's how to decide when to reach for one.