Minerallac SW037EG Zinc-Plated...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$52.09
$2.74
Minerallac SW037EG Zinc-Plated Steel Square Washer, 3/8" Bolt Size

Minerallac SW037EG Zinc-Plated Steel Square Washer, 3/8" Bolt Size

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Model: SW037EG

In Stock (leaves warehouse same day if ordered before 3pm ET)

$52.09
$2.74
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Minerallac SW037EG Zinc-Plated Steel Square Washer, 3/8" Bolt Size

The Minerallac SW037EG is a 3/8" square washer finished with an electro-galvanized zinc plating for corrosion resistance in general electrical and mechanical fastening applications. Sized to fit 3/8" bolts, this square washer distributes fastener load evenly across mounting surfaces, helping prevent pull-through and surface damage during installation. Manufactured in the United States, the SW037EG is built for reliable performance on conduit hangers, support systems, and structural fastening tasks where a durable, corrosion-resistant washer is required. Its square profile provides a larger, stable bearing surface than a standard round washer, making it a practical choice for electrical contractors and facility maintenance teams who need consistent, code-compliant hardware for support and mounting systems on job sites of any scale. The steel base combined with a zinc finish gives installers confidence that hardware will hold up over years of service, whether installed indoors in a commercial building or outdoors on exposed structural supports subject to moisture and temperature swings.

Key Features

  • Trade Size: Sized to fit 3/8" bolts for standard electrical and mechanical fastening applications.
  • Square Profile: Square washer design provides a larger, stable bearing surface compared to standard round washers, helping distribute load evenly and reduce surface damage at the mounting point.
  • Finish: Electro-galvanized zinc plating offers corrosion resistance for extended service life in industrial and commercial environments.
  • Consistent Fit: Engineered dimensions ensure a secure, repeatable fit on 3/8" hardware, reducing installation variability.
  • Durable Construction: Steel base with zinc plating supports demanding fastening tasks in electrical support and mounting systems.
  • Made in the USA: Manufactured in the United States, supporting consistent quality control and domestic sourcing requirements for specification-driven projects.

Technical Specifications

  • Country Of Origin: United States
  • Fits Bolt Sizes: 3/8"
  • Product Finish: Electro-Galvanized
  • Refer to manufacturer documentation for complete dimensional specifications including inside diameter, outside width, and thickness.

Typical Applications

  • Conduit and Cable Support Systems
  • Electrical Panel and Enclosure Mounting
  • Strut and Channel Fastening
  • General Commercial and Industrial Hardware Assemblies
  • Structural Bracket and Hanger Installations

Why Minerallac?

Minerallac fastening hardware is built for the demands of professional electrical and mechanical installations, combining a durable steel base with an electro-galvanized zinc finish for reliable corrosion resistance. The SW037EG square washer's U.S. manufacturing and precise 3/8" sizing make it a dependable choice for contractors and facility teams who need consistent, code-compliant hardware for their support and mounting systems. Whether used on conduit hangers, strut and channel assemblies, panel and enclosure mounting, or general structural fastening tasks, the SW037EG delivers the even load distribution and long-term corrosion protection that professional installers expect from Minerallac electrical hardware. Its square bearing surface reduces the risk of surface deformation on softer substrates and helps keep hardware assemblies secure over years of service in demanding commercial and industrial environments. For electrical contractors managing multiple job sites, standardizing on Minerallac square washers means predictable stock, repeatable fit, and hardware that meets the durability expectations of inspectors and facility engineers alike.

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Manufacturer Resources

Product Specs

Country Of Origin:
United States
Fits Bolt Sizes:
8-Mar
Inside Diameter:
16-Jul
Outside Width:
1/5/08
Product Finish:
Electro-Galvanized
Product Type:
Washer
Thickness:
4-Jan
Department:
Electrical
Product Subgroup:
Mounting Hardware
Product Group:
Hangers, Supports & Fasteners

Minerallac SW037EG – Frequently Asked Questions

1) Is the SW037EG square washer okay for damp or unheated indoor areas?
The finish is electro-galvanized zinc plating, which is a light corrosion coating meant for dry interior work such as mechanical rooms, ceiling spaces and general indoor conduit and rod hanging. It is not a hot-dip or stainless finish, so for exterior runs, wash-down areas or corrosive environments you should step up to a hot-dip galvanized or stainless square washer.
2) Why use a square washer instead of a round flat washer on 3/8 inch rod?
A square washer spreads the load over a wider bearing surface and seats flat across the lips of a strut channel or across a slot, where a round flat washer would want to roll into the opening. That is why electricians and mechanical contractors use them under nuts on 3/8 inch rod at strut, beam clamps and slotted angle. The SW037EG is the 3/8 inch square washer for that use.
3) Is the Minerallac SW037EG made in the USA for Buy American jobs?
Country of origin on the SW037EG square washer is the United States. That matters on federally funded and public agency work where domestic sourcing has to be documented, so it is worth capturing on the submittal.
4) Does the square washer come with a nut, or do I order hardware separately?
The SW037EG is the washer only. You supply the 3/8 inch nut and the 3/8 inch rod or bolt separately, and typically a second washer if you are clamping from both faces.
How fast can I get the Minerallac SW037EG delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Minerallac SW037EG come with a warranty?
Absolutely. The Minerallac SW037EG is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Minerallac SW037EG?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Minerallac SW037EG from ZenSupply?
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