Value Collection 742066PS M4 Internal Tooth Lock Washer

Product Description

The VALUE COLLECTION 742066PS is an M4 internal tooth lock washer designed to secure fastener assemblies against loosening caused by vibration and dynamic loads. The washer features serrated internal teeth that bite into the bearing surface of the fastener head and the mating workpiece, creating a mechanical lock. Constructed from Grade 2 spring steel with a zinc-plated finish for basic corrosion resistance, this washer measures 5.48mm inside diameter, 8.0mm outside diameter, and 0.5mm thickness. It is sold individually but carries a minimum order quantity of 200 units, making it suitable for production and maintenance applications requiring bulk hardware.

This lock washer is suited for M4 fastener assemblies in light mechanical, electrical panel, and general industrial applications. The internal tooth configuration makes it compatible with standard M4 screws and bolts where the washer must fit beneath a fastener head without extending beyond the head diameter. Typical install scenarios include control panel assembly, sheet metal fabrication, HVAC equipment assembly, and electrical enclosure work where vibration resistance is required without external tooth interference.

Key Features

• Internal tooth geometry grips both fastener head and substrate to resist rotational loosening
• Grade 2 spring steel provides the flexibility and hardness needed for effective tooth engagement
• Zinc-plated finish offers basic corrosion protection for indoor and light-duty environments
• 5.48mm ID fits M4 fasteners with minimal clearance for accurate centering
• 0.5mm thickness keeps stack height low in tight fastener assemblies
• Sold per piece with a 200-unit minimum order quantity for production or service stock

Compatibility

Designed for use with M4 screws and bolts in standard internal tooth lock washer applications across light mechanical, electrical, and industrial assembly work.

Installation Notes

Install this washer between the fastener head and the workpiece surface, with the teeth facing the fastener head and the flat side against the workpiece. Ensure mating surfaces are free of heavy coatings that would prevent tooth engagement. Torque the fastener to the assembly specification for the fastener grade in use. Lock washers are single-use components and should not be reused once the teeth have been compressed.