Minerallac 40915J 3/8" Bellevi...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$168.96
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Minerallac 40915J 3/8" Belleville Washer, Spring Steel, Pack of 100

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Model: 40915J

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

$168.96
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Minerallac 40915J 3/8" Belleville Washer, Spring Steel

The Minerallac 40915J is a 3/8" Belleville washer manufactured from spring steel and supplied in a convenient jar for easy dispensing at the job site or in the shop. Belleville washers are conical-shaped spring washers designed to maintain consistent tension and preload on bolted electrical and mechanical connections, helping compensate for thermal expansion, vibration, and material settling over time. The spring steel construction of the Minerallac 40915J provides the resilience and load-bearing characteristics needed for dependable fastener performance in demanding installation environments. Packaged in a jar for organized storage and quick access, this 3/8" Belleville washer is a practical addition to any electrical contractor's hardware inventory.

Key Features

  • Trade Size: 3/8" Belleville washer sized for standard bolt and fastener applications.
  • Durable Construction: Spring steel material provides consistent spring tension and long-term durability under load.
  • Conical Spring Design: Maintains bolted connection preload, helping offset vibration and thermal cycling that can loosen fasteners over time.
  • Jar Packaging: Supplied in a jar for organized storage, quick counting, and easy access on the truck or in the shop.
  • Electrical Hardware Compatibility: Sized to work with common 3/8" bolted connections found in electrical and mechanical assemblies.

Technical Specifications

  • Trade Size: 3/8"
  • Material: Spring Steel
  • Packaging: Jar

Typical Applications

  • Electrical Panel and Equipment Bolted Connections
  • Grounding and Bonding Hardware Assemblies
  • Conduit and Support Hardware Fastening
  • General Electrical Contractor Hardware Stock
  • Maintenance and Retrofit Bolted Joint Repairs

Why Minerallac?

Minerallac supplies dependable, purpose-built hardware for electrical professionals, and the 40915J Belleville washer reflects that focus with its spring steel construction and job-ready jar packaging. Electrical contractors rely on Minerallac hardware components like this 3/8" Belleville washer to keep bolted connections secure and consistent across demanding installation and maintenance work.

Manufacturer Resources

Product Specs

list_batch:
MIN-20260924
Product Type:
Washer
Department:
Electrical
Product Subgroup:
Electrical Fasteners
Product Material:
Spring Steel
Product Size:
3/8"
Product Group:
Hangers, Supports & Fasteners
Country of Origin:
United States
Product Finish:
Zinc Plated

Minerallac 40915J – Frequently Asked Questions

1) Why use a Belleville washer instead of a standard flat or split lock washer on a bolted electrical connection?
A Belleville washer is conical, so it acts as a spring under the bolt head and keeps preload on the joint as the metal expands, contracts, and settles. That matters on aluminum and copper electrical connections, where thermal cycling can leave a flat-washer joint loose. A split lock washer resists backing off but does not hold tension the way a cone washer does. The 40915J is the 3/8 inch spring steel version of that cone washer.
2) Is the Minerallac 40915J washer plated for corrosion resistance?
The 40915J is zinc plated spring steel. That plating handles typical indoor electrical room, panel, and shop conditions. For continuously wet, exterior marine, or chemically aggressive locations, a stainless cone washer is the better call.
3) Can I use these washers on grounding and bonding connections?
Yes. Grounding and bonding hardware assemblies are one of the stated applications for the 40915J, along with electrical panel and equipment bolted connections, conduit and support hardware, and retrofit bolted joint repairs. The point in those joints is keeping the conductor-to-lug contact pressure stable over time.
4) Which way does a Belleville washer go on, and do I need a flat washer with it?
The cone sits crown up, with the convex side toward the bolt head or nut so the washer can flatten as you torque it. On softer surfaces or oversized holes installers commonly add a flat washer under it to spread the load. The 40915J jar contains only the 3/8 inch Belleville washers, so any flat washers, bolts, or nuts are a separate line on the order.
5) Are Minerallac Belleville washers made in the USA?
The 40915J is manufactured in the United States, which matters on government, institutional, and public-works jobs carrying domestic sourcing requirements on electrical hardware.
How fast can I get the Minerallac 40915J 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 40915J come with a warranty?
Absolutely. The Minerallac 40915J 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 40915J?
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 40915J from ZenSupply?
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