Bow Tie Hex Washer Sem 5/16-18x1 Gardener - 10-25280

Self-tapping hex washer fastener that locks in and stays put under vibration.

• ▸Taps its own thread — no backing nut needed
• ▸Captive external tooth washer spreads clamp load evenly
• ▸Serrated washer bites surface to resist backing out
• ▸5/16-18 thread pitch suits medium-duty bracket and panel work
• ▸One-piece SEM construction simplifies installation in tight spaces

“The details that finish a build properly.”

Cheap fasteners back out. The captive tooth washer on this Aeroflow SEM screw mechanically locks against the substrate the moment it seats, so vibration works against the bite rather than the thread engagement. For sheet metal mounting where a loose fastener means a rattling bracket or a failed accessory mount, the integrated design earns its place over a standard hex head and loose washer combination.