Double-Stack Self-Locking Washer (Wedge-Locking Series)

Overview

Anti-loosening fasteners resist self-loosening under transverse vibration, which is the loading mode that actually causes bolted joints to come apart. Friction alone does not solve it: the joint loses preload through repeated transverse slip at the thread and bearing faces, and the fastener has to interrupt that mechanism rather than simply add friction. This listing: material Alloy steel, finish Zinc plated / black oxide, features Self-locking, for humanoid robots, environmental compliance REACH and RoHS compliant.

Advantages

Transverse vibration, not axial load, drives self-loosening; a design that resists transverse slip keeps preload where a higher-friction plain nut does not.

Mechanical locking elements maintain a prevailing torque independent of clamping force, so the joint stays locked even if preload is lost.

Reusable locking designs can be opened for service without replacing the fastener, unlike deformed-thread or adhesive locking.

Applications

Vehicle chassis and driveline joints, machinery subject to vibration, rail and off-highway equipment, and any joint where a backed-out fastener creates a safety risk.

Ask for the test basis: a Junker test result at a stated preload and amplitude is comparable across suppliers, a claim of vibration resistance without test conditions is not.

Product information is supplied by Toprecision. Custom parts can be produced to drawing — contact us for samples or a quotation.