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Rubber Well Nuts Brass Insert Expansion Nut SAE Inch Sizes #10-32 x 0.665 (0.035-0.232 Grip) 0.377 inch Hole Qty 100

Free shipping on orders over $29.99

$62.37

$ 26 .99 $26.99

In Stock

1.:25


2.:1/4-20 X 0.630 (0.015 - 0.111 Grip) 0.500 In Hole


About this item

  • Marine Grade EPDM Rubber with Brass Threaded Insert
  • Listed As: Thread Size x Overall Length (Grip Range) Hole Size / Outer Diameter
  • Commonly used in Automotive racking systems, Kayaks, Motorcycle Windscreens, Hardware in Utility Trucks, Compressors and Engines
  • Creates a waterproof seal and minimizes vibration and shocks - Vibration isolation helps to prevent rattle and pull-out
  • Rubber Well nuts are a common choice for waterproofing holes where an attachment is needed.



Product Description

  • Creates a waterproof seal
  • Minimizes vibration and shocks
  • Easy to install or remove
  • Highly corrosion resistant - Marine Grade
  • Can be installed into blind holes

Well nuts are a mostly rubber (EPDM) fastener with a hidden brass nut near the end. They have a flange on one end with a long barrel that is inserted into a hole. Rubber Well nuts are a common choice for waterproofing holes where an attachment is needed. A well nut is also commonly referred to as a rawl nut, rawlnut, or a rubber rivet nut.

WARNING: This product can expose you to chemicals such as nickel, lead, or chromium, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

well nuts

Well Nuts

A Well Nut is a removable rivet nut made of two parts. A flanged rubber portion made of EPDM Neoprene and a brass insert nut. Well nuts only require one side of the hole to be exposed so they can be used for blind fastenings. Also called a rubnut, rubber nut or rawlnut, is a fastener used when something needs to be connected to a surface (in most cases where only one side is available).

Well Nuts Features

rawl nuts

EPDM Rubber with Brass Threaded Insert

Well nuts in this selection feature an EPDM Rubber sleeve with a brass threaded insert. The durability and sealing power of the rubber makes these fasteners considered water resistant, and the brass insert is resistant to corrosion making these nuts safe for applications exposed to the elements such as motorcycle windscreens, boat mounting accessories and more!

Installed Well Nut

Installed Well Nut

The picture above shows the "blind side" of an installed well nut, to show what's is going on behind the scenes.

well nuts

Benefits and Uses

Well nut benefits:

  • Water Resistant
  • Marine Grade
  • Blind Fastening
  • Deter Negative Effects Of Vibrations and Shocks
  • Easily Replaceable

Well nuts are mostly prized for their water resistant, marine grade and blind fastening properties but can be used in many different situations. These blind insert rivet nuts can be used to deter vibrations and shocks in machinery. They are also quite common in compressors and mirrors for similar reasons.


Everyday User
Reviewed in the United States on July 2, 2022
Quality product, no issues.
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