40610 Split Lock 3/8 Washer Box/100

Overview The Midwest Fastener 40610 Split Lock Washer (03946) is designed for hardware fastener applications requiring reliable prevention of threaded fastener loosening under vibration or load. Specification Detail MPN 03946 Brand Midwest Fastener Product Number 40610 Size 3/8" Package Quantity Box of 100 Package Weight 3.91 lb Category Hardware Fasteners > Washers Technical Features Split lock design: The open split in the washer creates two sharp edges that bite into both the fastener and the mounting surface, generating friction that resists rotational loosening. 3/8" sizing: Matched to standard 3/8" threaded fasteners, ensuring proper load distribution across the bearing surface without over- or under-sizing. Box of 100 units: Bulk packaging reduces per-unit cost and ensures an adequate supply for multi-fastener assemblies or ongoing maintenance tasks. 3.91 lb box weight: Provides a practical reference for shipping and jobsite inventory management when ordering in quantity. Applications Securing bolts and nuts in mechanical assemblies subject to vibration, where fastener loosening presents a safety or performance risk. General construction and structural fastening applications using 3/8" threaded hardware. Equipment assembly and maintenance tasks requiring a reliable, friction-based anti-loosening solution at the fastener interface. Bulk supply for contractors, maintenance facilities, or workshops maintaining an inventory of standard 3/8" fastener hardware.