Value Collection SIW7X0300-200BX M3 Lock Washer Stainless

Product Description

The VALUE COLLECTION SIW7X0300-200BX is a stainless steel internal tooth lock washer sized for M3 fasteners. It features an internal tooth design that bites into the bearing surface of the fastener and the mating material to resist loosening under vibration and dynamic loads. Manufactured from 18-8 austenitic stainless steel to Grade A2, it delivers solid corrosion resistance in wet, humid, or mildly chemical environments. With a 3.2mm inside diameter, 6.0mm outside diameter, and 0.4mm thickness, it is a compact, lightweight washer suited for precision assemblies where space is limited. These washers ship in a minimum order quantity of 200 per package.

This lock washer is used in electrical panels, HVAC equipment enclosures, plumbing fixture assemblies, and light structural applications where M3 machine screws or bolts require positive locking. The internal tooth configuration keeps the washer centered on the fastener shank, making it preferable in applications with small clearance holes or close-tolerance hardware. Grade A2 stainless steel construction makes it appropriate for installations exposed to moisture, including outdoor electrical enclosures and pool equipment panels.

Key Features

• Internal tooth design centers on fastener shank and resists rotational loosening under vibration
• 18-8 austenitic stainless steel, Grade A2 for corrosion resistance in wet and humid environments
• 3.2mm inside diameter for direct fit on M3 screws and bolts
• 0.4mm thickness suits close-clearance and precision assemblies
• Uncoated finish — no coating delamination risk in corrosive service conditions
• Sold in multiples of 200, suitable for production, service fleet, or bench-stock replenishment

Compatibility

Designed for use with M3 machine screws and bolts in applications requiring an internal tooth lock washer with a 3.2mm inside diameter and 6.0mm outside diameter.

Installation Notes

Lock washers should be installed between the fastener head and the mating surface, or between a nut and the mating surface, with the teeth oriented toward the bearing face. De-energize or shut down equipment before installing or removing fasteners in electrical or mechanical assemblies. Do not reuse lock washers that have been fully compressed or visibly deformed, as the tooth spring action will be compromised. Follow applicable NEC or equipment manufacturer torque guidelines for the fastener size and joint material.