Value Collection SIW8XX1200-100BX M12 Lock Washer 13mm

Product Description

The VALUE COLLECTION SIW8XX1200-100BX is a stainless steel internal tooth lock washer designed for use with M12 fasteners. It features a serrated internal tooth design that bites into the mating surface under load, resisting loosening from vibration and torque. The washer is manufactured from Grade 316 austenitic stainless steel to the A4 material standard, providing strong resistance to corrosion in wet, chemical, and marine environments. With a 13.0mm inside diameter and 20.5mm outside diameter, it is sized for standard M12 bolt applications. The uncoated finish preserves the natural properties of the stainless steel alloy. This fastener hardware is commonly installed by millwrights, pipefitters, electricians, and mechanical contractors working on equipment assemblies.

This internal tooth lock washer is suited for residential, commercial, and industrial mechanical assemblies where vibration resistance and corrosion protection are required. Typical applications include pump and motor mounting, plumbing system connections, electrical enclosure hardware, HVAC equipment fastening, and structural equipment assembly where M12 fasteners are specified. The Grade 316 stainless steel construction makes it appropriate for coastal, chemical processing, or high-moisture environments. This item is sold in a minimum order quantity of 100 pieces per box.

Key Features

• Internal serrated tooth design locks against mating surface to resist fastener loosening under vibration
• Grade 316 austenitic stainless steel construction to A4 material standard for superior corrosion resistance
• 13.0mm inside diameter sized for M12 fasteners
• 20.5mm outside diameter and 1.0mm thickness for standard M12 washer seating
• Uncoated finish retains full stainless steel corrosion-resistance properties
• Sold in a box of 100 pieces to support production and service inventory needs

Compatibility

Designed for use with M12 screws and bolts in standard mechanical and structural fastening applications requiring an internal tooth lock washer.

Installation Notes

Installation is performed by mechanical, plumbing, or electrical tradespeople as part of fastener assembly work. Seat the washer flat against the mating surface with the teeth facing the fastener head or nut, not the workpiece surface, to ensure proper bite and locking action. Ensure fastener threads and seating surfaces are clean and free of debris before assembly. Do not reuse lock washers that have been fully compressed or show signs of deformation, as locking effectiveness will be reduced.