Value Collection FWSIS0-40-100BX Sae Flat Washer No. 4

Product Description

The VALUE COLLECTION FWSIS0-40-100BX is a No. 4 screw SAE flat washer made from steel with a zinc-plated finish. SAE flat washers provide a standard bearing surface under a bolt head or nut, distributing load and reducing surface damage during fastening. This washer measures 0.125 inches inside diameter, 0.3125 inches outside diameter, and 0.03125 inches thick. The zinc plating provides basic corrosion resistance suitable for general-purpose indoor and light-duty outdoor fastening applications. These are sold in a minimum order quantity of 100 pieces per order, with a package quantity of 1.

This washer is sized for No. 4 screws and is appropriate for light mechanical assemblies, HVAC panel fastening, electrical enclosure hardware, and general trade work where a thin, small-diameter bearing washer is required. The SAE standard sizing makes it a common choice across plumbing, electrical, and HVAC service work wherever a No. 4 fastener is used. Suitable for residential and light commercial applications where the assembly environment does not demand stainless or higher-grade corrosion resistance.

Key Features

• SAE flat washer profile sized for No. 4 screws
• Steel construction with zinc-plated finish for basic corrosion resistance
• Inside diameter of 0.125 inches fits No. 4 screw shanks
• Outside diameter of 0.3125 inches provides load distribution on small fasteners
• Thickness of 0.03125 inches keeps stack height minimal in tight assemblies
• Inch measurement system; UNSPSC Code 31161807

Compatibility

Designed as a standard SAE flat washer for use with No. 4 screws in general-purpose fastening applications across HVAC, electrical, and mechanical assemblies.

Installation Notes

Install with standard hand tools; no special equipment is required for flat washer placement. Ensure the washer seats flush against the mating surface before tightening the fastener. For corrosive or wet environments, evaluate whether a stainless steel or higher-rated finish is more appropriate than zinc plating. Power down any electrical or mechanical equipment before servicing fasteners on live assemblies.