Rubber Washers 3/8" ID Rubber Flat Washers 3/8" ID X 1 1/4” OD 1/4” Thick Specifications: Inner Diameter (ID): 3/8" Outer Diameter (OD): 1.25” Thickness: 1/4” Material: Premium Grade EPDM Durometer Rating 60A RubberMax 100 Series “Strength in Every Application” Applications include: Rubber Spacers Marine Rubber Washers Rubber Sealing Washers Industrial Rubber Washers Plumbing Rubber Washers Rubber Washers for Sealing Automotive Rubber Washers Construction Rubber Washers Electrical Equipment Washers Rubber Gaskets for Fasteners Weather-Resistant Rubber Washers Vibration Damping Properties:
At 1/4” thick, they excel as vibration dampers and rubber spacers, making them ideal for industries such as automotive, electronics, trucking, marine, and more. Durometer
  • Lamp Sockets
  • Pigtails
  • Grounding
  • Fuses
  • Fuse Blocks
 

Rubber Washers 3/8" ID Rubber Flat Washers 3/8" ID X 1 1/4” OD 1/4” Thick Specifications: Inner Diameter (ID): 3/8" Outer Diameter (OD): 1.25” Thickness: 1/4” Material: Premium Grade EPDM Durometer Rating 60A RubberMax 100 Series “Strength in Every Application” Applications include: Rubber Spacers Marine Rubber Washers Rubber Sealing Washers Industrial Rubber Washers Plumbing Rubber Washers Rubber Washers for Sealing Automotive Rubber Washers Construction Rubber Washers Electrical Equipment Washers Rubber Gaskets for Fasteners Weather-Resistant Rubber Washers Vibration Damping Properties:
At 1/4” thick, they excel as vibration dampers and rubber spacers, making them ideal for industries such as automotive, electronics, trucking, marine, and more. Durometer

3/8" ID x 1-1/4" OD x 1/4" Thick Rubber Flat Washers – Premium EPDM

Durable EPDM rubber washers designed for sealing, spacing, vibration dampening, and all-weather resistance.

Suitable for sealing, spacing, and vibration control across plumbing, automotive, and industrial uses.

Note: Washer size refers to the inside diameter (ID); outside diameter (OD) and thickness are listed above.

Key Features

• Material: Black EPDM Rubber
• Hardness: Durometer 60 ±5 Shore A
• Temperature: -20°F to 250°F (-40°C to 120°C)
• Excellent abrasion and wear resistance
• Resistant to water, saltwater, and steam
• Resistant to ozone, UV exposure, weathering, and aging
• Resistant to dilute acids and alkalis
• Compatible with silicone oils and greases
• Non-conductive, all-weather rubber

Common Uses

Automotive & Transport: washers, vibration isolators, body hardware
Industrial & Construction: spacers, assembly hardware, fastener seals
Plumbing & Marine: sealing washers, marine equipment
Electrical & Electronics: mounting, enclosures, vibration dampening
DIY / Replacement: rubber washers, shims, bumpers

Order With Confidence

• Fifth year on eBay with a 99.8% approval rating from over 51,000 reviews
• Visit our store for fasteners, hole plugs, rubber feet, rubber grommets, thumb knobs, tubing plugs, rubber washers, and more

 

Package & Ordering Info

Bulk packs for maintenance, repair, fabrication, or DIY

Package Options - Please use the drop-down box for needed quantity

Free USPS Ground Advantage shipping with tracking

Ships from USA warehouse

 

Product Specs
Item Thickness: 1/4"
Hole Size: 3/8" (.375/10mm)
Item Diameter (Interior): 3/8" (.375/10mm)
Item Diameter: 1 1/4"
Material: Rubber
Grade: Premium grade
MPN: NA
Brand: Alltrade Supply Inc
Type: 3/8" (.375/10mm) Rubber washer
System of Measurement: Inch
Unit Type: Unit
Number in Pack: Various pack sizes available

7-Wire Headlight Female Connector Plug 2005-2011 Lincoln Town Car 2007-2015 MKX

$20.79

NMO Mount Antenna Rubber Gaskets Car Audio Marine Autobody 10 per Package

$10.95

Waterproof 16-Pin Molex type Female Wired Connector Harness Lights, ABS, ECU

$23.79

2 Pack MEGA Style Fuse Block Holder 60A–300A 12-24V High Current w/ Fuse & Cover

$23.5

Silicone Rubber Hole Plugs – 12 Sizes, 15/Pack – Auto Dash, Firewall, Trunk Seal

$12.19

Side Lamp Bulb Socket VW T4 Transporter 1990–2003, 191941669A Equivalent – 2 Pc

$14.95

Aluminum Mechanical Lug 2 AWG Dual Rated 2-Port for Industrial Electronics

$16.29

6 Position 25A - 10AWG Dual Row HD Terminal Block Strip w/ Cover + Jumpers

$13.79

1/4" ID x 1 1/4" OD x 1/16" XL Rubber Flat Washers Autobody Fender Washers

$11.79

Rubber Panel Plug, Knockout Plug, Fits 1/16” Panel, 6 Sizes 10 per Pack

$10.88

1 1/8" Auto & Truck Bumper Plugs Black Sensor Hole Covers 10 per pack

$13.38

1/4” x 1/8" x 3/8" Push-In Rubber Step Bushings Motorcycles Auto Electronics

$13.91
Add suggested items to your listings - Check it out on 3Dsellers.com

We ship every day Monday - Friday.

PayPal is the preferred payment method.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

Featured Products

· All Rights Reserved to My Store · 
These rubber flat washers are commonly used as sealing washers, rubber spacers, and vibration isolators in plumbing, automotive, marine, electrical, and general hardware installations. Designed for spacing, sealing, and cushioning between metal or plastic surfaces, they help reduce vibration, prevent leaks, and limit surface wear. Non-conductive rubber construction provides reliable sealing performance in moisture-prone and light oil-exposure environments, making these flat rubber washers suitable for professional repair, maintenance, and DIY applications