Value Collection SIW8XX2000-050BX M20 Lock Washer

Product Description

The VALUE COLLECTION SIW8XX2000-050BX is a stainless steel internal tooth lock washer sized for M20 screws. It features a 21mm inside diameter and a 33mm outside diameter with a thickness of 1.4mm. The serrated internal teeth grip the mating surface and fastener head to resist loosening caused by vibration or torque relaxation. Manufactured from Grade 316 Austenitic Stainless Steel (A4), this washer provides strong corrosion resistance in wet, chemical, and marine environments. It ships uncoated and conforms to DIN 6797 and DIN 6798 standards. Plumbers, pipefitters, marine electricians, and mechanical contractors install these washers where fastener retention in corrosive conditions is required.

This internal tooth lock washer is suited for use in residential and commercial mechanical assemblies, marine hardware installations, and process piping connections where M20 fasteners are specified. The Grade 316 stainless construction makes it appropriate for saltwater exposure, chemical processing environments, and exterior applications subject to moisture and oxidation. It is sold in a minimum order quantity of 5 pieces, with each package containing 1 washer.

Key Features

• Grade 316 Austenitic Stainless Steel (A4) construction for superior corrosion resistance
• Internal serrated teeth grip fastener and mating surface to prevent loosening under vibration
• 21mm inside diameter — designed for M20 screw applications
• 33mm outside diameter provides broad bearing surface distribution
• 1.4mm thickness meets DIN 6797 and DIN 6798 dimensional standards
• Uncoated finish — no surface treatment to degrade or flake in service

Compatibility

Designed as an OEM-style replacement or service component for assemblies using M20 fasteners that require an internal tooth lock washer per DIN 6797 or DIN 6798 specifications.

Installation Notes

Installation is performed by qualified mechanical, plumbing, or electrical trades depending on the application. Shut down and de-energize or depressurize the assembly before disassembling fastened joints. Place the washer between the fastener head and the mating surface with the teeth facing the fastener head for proper grip. Do not reuse lock washers that have been fully compressed or show deformation from prior service.