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RUBBER & SILICONEStandard parts. Custom solutions.

Rubber nut caps

Rubber nut caps

If you ever need to add a better finish to the ends of nuts and bolts, then look no further than rubber nut caps. The whole idea when using rubber nut caps is to protect the end of the nut or bolt from corrosion. While this is the primary role, secondary roles are geared more towards protective capabilities such as closing sharp edges. Adding nut caps is a very smart way to protect exposed nuts and bolt end. 

With all that said, rubber nut caps are used in hundreds of applications. Since the material of the object is rubber, it comes with a certain set of properties. These include water resistance, oil resistance, temperature resistance, anti-slip properties, and more. The main choice of rubber material in the making of these objects is EPDM or Silicone, although plenty of other materials exist. Rubber nut caps are very easily installed and come in various shapes and sizes. The whole point is for the cap to fit at the end of a nut or bolt to protect it and give it a better look. 

They are designed in a way that you don’t require any tool to install them. All you need to do is find the shape and size that fits your nut or bolt and simply add it. The rubber properties make sure that the cap stays firmly at the end of the nut, bolt, or screw and doesn’t fall off. If you’re struggling to find the right size cap for your needs, simply navigate to our size chart where you can compare what sort of cap fits your needs. 

Black is the most common color that nut caps come in, but they can also come in various other such as red, green, and any color that you need. Lastly, we will help you make the right purchasing decision when buying rubber nut caps.

Rubber Cap Size Catalog

Compare the internal and external dimensions of rubber caps against the part being covered.

Custom colors are available to your Pantone color code. Include the code in your inquiry.

Rubber Caps-RSE

Compare A (inner diameter), B (outer diameter), C (inner depth) and D (total height), in mm.

Dimension guide
Rubber cap — A inner diameter, B outer diameter, C inner depth, D total height
Profile reference. Use the dimension letters and units in the selected table and confirm the part drawing.
Product appearance
Rubber Caps-RSE — product view
Illustrative product appearance. Refer to the selected row and part drawing for dimensions.
Part No.ABCD
RSE3.7-7-93.77911
RSE4.7-8-94.78911
RSE5.7-9-105.791012
RSE6.7-10-106.7101012
RSE7.7-11-117.7111113
RSE8.7-12-128.7121214
RSE9.7-14-139.7141315
RSE10.7-15-1410.7151416
RSE11.7-16-1511.7161517
RSE12.7-17-1512.7171518
RSE13.7-18-1513.7181518
RSE14.7-19-1514.7191518
RSE15.7-20-1615.7201619
RSE16.7-21-1616.7211619
RSE17.7-22-1617.7221619

Need a different size? Share your drawing, mating dimensions and intended use to discuss a suitable part.

Discuss Your Requirements

Product specifications

Product form
Protective cover for exposed fastening hardware
Material options discussed
Silicone and EPDM. Choose one formulation for the actual contact and loading conditions.
Dimensions to confirm
Nut across-flats and across-corners dimensions, exposed height and cap cavity.
Installation discussed
Screw attachment. Identify the chosen retention method and the surface or hardware it engages.
Exposure to evaluate
Oil splash. Validate the selected material under the combined conditions.
Access after fitting
Leave room for fitting and removal without displacing the fastener.

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