How To Test Rubber Well Nut

What is Rubber Well Nut/ Rubber Nut Insert

Rubber nut is made of a EPDM or neoprene rubber with a brass nut insert.
The rubber and brass is high quality, it is hrad and can be used for many times.
Using a bolt or screwm put it into the brass insert, then screw it, the rubber will expand to fix on the plate.

How to test Rubber Well Nut
Except screws, rubber well nuts are also an important part of fasteners. So quality is important. Rubber well nut is used for many different application, like boats motorcycle windshields and other industrial application. As the mechanical stress is concentrated on the connection points, so the rubber well nut quality is very important, so we need to test it after production.

Related products
We Ningbo Hengya Commodity Co., Ltd. Have M3 M4 M5 M6 M8 M10 M12 rubber well nut.
Today we test on kind of M6 rubber well nut

1:Appearance dimension test

First we need 5 well nut samples to test the size
 

this is the drawing

Drawing size:25.8±0.3mm，

actual size:25.67mm,25.69mm,25.71mm,25.74mm,25.71mm.
Test result: Pass

Drawing size:18.3±0.3mm，

actual size:18.25mm,18.28mm,18.31mm,18.29mm,18.22mm.
Test result: Pass

Drawing size:27±0.3mm，

actual size:27.11mm,27.28mm,27.25mm,27.17mm,27.24mm.
Test result: Pass

Drawing size:1.8±0.2mm，
actual size:1.82mm,1.81mm,1.8mm,1.81mm,1.86mm.
Test result: Pass

Drawing size:7±0.2mm，

actual size:7.07mm,7.09mm,7.1mm,7.05mm,7mm.
Test result: Pass

2:The different temperature tensile test of rubber well nuts

Cooling equipment：-40 ℃ ——120℃

fixed

Set temperature: -40 degree

Maintain 10 minutes

Install quickly to tension machine

Application of a force 550 N, There are no degumming

The force of 915 N, no degumming

Tensile machine limits.The force of 1024N,There is no change

After the test：There is no degumming and No broken