Value Collection A410360 M20 Flat Washer 316 Ss 10 Pack

Product Description

The VALUE COLLECTION A410360 is an M20 standard flat washer manufactured from Grade 316 stainless steel with a plain finish. Flat washers distribute load across a fastened joint, reducing surface damage and preventing pull-through on bolted assemblies. This washer measures 21 mm inside diameter by 37 mm outside diameter and is 3 mm thick, conforming to DIN 125 and ISO 7089/7090 fastener standards. With a hardness rating of 140 HV, it provides consistent performance in corrosive or marine environments where Grade 316 alloy offers superior resistance compared to Grade 304. Sold in packs of 10, this metric-series washer suits structural, mechanical, and industrial fastening applications.

This washer is intended for use with M20 metric fasteners in applications requiring corrosion resistance, such as marine hardware, chemical processing equipment, outdoor structural assemblies, and coastal construction. The plain finish keeps the washer free of coatings that could interfere with torque values or galvanic compatibility in stainless steel fastener assemblies. It is a standard choice for plumbers, pipefitters, millwrights, and general contractors working with metric hardware in wet or chemically aggressive environments.

Key Features

• Grade 316 stainless steel construction for superior corrosion resistance in marine and chemical environments
• Conforms to DIN 125 and ISO 7089/7090 fastener standards for metric flat washers
• 21 mm inside diameter sized for M20 screws and bolts
• 3 mm thickness provides solid load distribution across fastened surfaces
• 140 HV hardness rating for consistent performance under clamping loads
• Plain finish with no coating, compatible with stainless steel fastener assemblies

Compatibility

Designed for use with M20 metric screws and bolts. Conforms to DIN 125 and ISO 7089/7090 standards for standard flat washers in metric fastener assemblies.

Installation Notes

Installation does not require specialized tools beyond standard wrenches or sockets sized for the M20 fastener being used. Always ensure the washer is seated flat against the mating surface before tightening to achieve proper load distribution. In stainless steel assemblies, apply an anti-galling compound to threaded fasteners to prevent seizing during torquing. Follow applicable mechanical or structural codes for the specific installation context.