Star Washer 1/4-20 External Tooth Lock Washer (100 Pack)

Description

This 1/4-20 star washer is an external-tooth lock washer in a 100-piece pack, sized for use with 1/4 inch bolts and 1/4-20 threaded fasteners. The serrated tines bite into the underside of the bolt head and the work surface, locking the joint against vibration loosening. Stocked as a Chemical Concepts house item for fast turnaround on production hardware orders.

Key Features and Benefits

• External serrated teeth for maximum bite under standard bolt heads
• Sized for 1/4 inch nominal screw, 1/4-20 thread compatible
• Sold in counted 100-piece bags for accurate stockroom planning
• Conforms to ASME B18.21.1 for external tooth lock washer dimensions
• Resists working loose under vibration without thread-locker
• Stock item with same-day pick from our Dallas warehouse

Common Applications for 1/4-20 Star Washer

• Bolted electrical ground connections that need a metal-to-metal bite
• Sheet metal joints in HVAC duct, control panels, and machine guards
• Maintenance kits for production equipment subject to vibration
• OEM assemblies where a lock washer beats a flat-washer-and-lock-nut stack on cost
• Field service kits for technicians servicing bolted hardware

Compatible Hardware

• 1/4-20 UNC machine screws and cap screws
• 1/4 inch bolts in standard hex, button, and socket head styles
• Standard 1/4 inch flat washers when stacked under the star
• 1/4-20 hex nuts and nylon-insert lock nuts

1/4-20 Star Washer Technical Specifications

Packaging and Ordering

Sold in counted 100-piece bags. For larger production runs, talk to us about bulk-bag pricing and container quantities. Need other thread sizes or finishes? Browse our broader specialty fasteners catalog. The dimensional standard for external tooth lock washers is published in ASME B18.21.1.

Need Help?

Need a different size, finish, or pack count? Our hardware team can pull a quote on stainless, zinc, or black-oxide variants and match a 1/4-20 star washer to your assembly. Call (800) 220-1966 or email [email protected].