Value Collection 3BWFS905 Standard Flat Washer No. 20

Product Description

The VALUE COLLECTION 3BWFS905 is a standard flat washer made from silicon bronze, sized for a No. 20 screw. Flat washers in this category distribute load across a fastened joint, protect mating surfaces, and reduce the risk of fastener pull-through. Silicon bronze offers strong corrosion resistance in marine, coastal, and wet industrial environments where steel hardware would degrade quickly. This washer measures 0.336 inches inside diameter, 0.75 inches outside diameter, and 0.064 inches thick. It follows inch-system dimensioning and meets the UNSPSC commodity classification 31161807. Installers in plumbing, marine, and general mechanical trades reach for silicon bronze hardware when saltwater exposure or chemical resistance is a primary concern.

This flat washer is suited for residential and commercial fastening applications where a standard-profile washer is required under a bolt head or nut. Typical use cases include marine deck hardware, plumbing fixture mounting, electrical enclosure assembly, and any structural or mechanical joint that demands non-ferrous corrosion resistance. The No. 20 screw size and inch-system dimensioning make this washer compatible with standard inch-series fastener assemblies. These washers are sold individually but are subject to a minimum order quantity of 100 pieces, making them practical for contractors and maintenance shops stocking corrosion-resistant hardware in quantity.

Key Features

• Silicon bronze construction provides strong resistance to saltwater, moisture, and many industrial chemicals
• Standard flat washer profile distributes clamping load and protects mating surfaces
• 0.336 inches inside diameter fits No. 20 screw shanks with standard clearance
• 0.75 inches outside diameter provides adequate bearing surface for typical fastener heads and nuts
• 0.064 inches thickness keeps the washer stack height low in space-constrained assemblies
• Inch-system dimensioning for direct use with standard inch-series fastener specifications

Compatibility

Designed as a standard flat washer for use with No. 20 inch-series screws and bolts requiring a silicon bronze, corrosion-resistant washer in inch-system fastener assemblies.

Installation Notes

Flat washers are installed by general mechanics, plumbers, electricians, and marine technicians using standard hand tools. Place the washer over the fastener shank before seating the nut or driving the screw into the mating surface. Verify that the inside diameter clears the fastener shank without binding and that the outside diameter provides the intended bearing area. Do not mix silicon bronze washers with dissimilar metals in assemblies where galvanic corrosion could be a concern.