Value Collection SEW8XX1800-050BX M18 Lock Washer

Product Description

The VALUE COLLECTION SEW8XX1800-050BX is a stainless steel external tooth lock washer designed for M18 fastener applications. It features a serrated external tooth profile that bites into mating surfaces to resist loosening under vibration and dynamic loads. Manufactured from Grade 316 austenitic stainless steel (A4), this washer delivers strong corrosion resistance in harsh, wet, or chemically exposed environments. The uncoated finish maintains dimensional consistency and is suitable for applications where coating buildup cannot be tolerated. Installed by maintenance technicians, pipefitters, and mechanical assemblers, it is a reliable hardware component for industrial and structural fastening.

This washer is sized for M18 screws and bolts with a 19mm inside diameter and 30mm outside diameter. Its 1.4mm thickness suits standard M18 fastener stack-ups. The Grade 316 stainless steel construction makes it well suited for marine, food processing, chemical processing, and outdoor structural applications where corrosion resistance is critical. The external tooth design is appropriate for through-bolt installations where the washer seats against a flat surface and positive locking retention is required.

Key Features

• External serrated tooth profile resists rotation and loosening under vibration
• Grade 316 austenitic stainless steel (A4) for superior corrosion resistance
• 19mm inside diameter — fits M18 fasteners
• 30mm outside diameter with 1.4mm thickness for standard M18 stack-ups
• Uncoated finish — no coating buildup affecting tolerances
• Meets DIN 6797 and DIN 6798 standards

Compatibility

Designed for use with M18 screws and bolts. Conforms to DIN 6797 and DIN 6798 specifications for external tooth lock washers.

Installation Notes

Install by a qualified technician or mechanical assembler familiar with metric fastener systems. Ensure mating surfaces are clean and free of debris before seating the washer to allow the external teeth to engage properly. De-energize and isolate any equipment before servicing fastened assemblies. Do not reuse lock washers that have been fully compressed or show visible deformation, as locking effectiveness is reduced.