Expansion Grommets

Expansion grommets are types of PCB (printed circuit board) spacers used to secure PCBs or panels.

What are expansion grommets used for?

Expansion grommets are used to securely fasten and space panels or components in many industries. They are found in domestic appliances, motor vehicles and electrical circuit boards.

Types of expansion grommets

There are several types of expansion grommets suitable for various applications. Front mounted standard screw grommets, for example, provide increased bearing area and added thread engagement. The non-conductive parts fully cover up the metal screws, providing electrical insulation, as well as protection against moisture, temperature transfer and exposed screw points.

Round hole screw grommets are used in applications with a punched or drilled hole. A pin in the grommet expands the grommet’s prongs as it’s driven into the hole. This provides friction between the inside of the hole and the grommet, locking it securely in place and preventing the screw from rotating in the hole.


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Description Price Body Height For Screw Size Material Mounting Hole Length Mounting Hole Width
RS Stock No. 507-3306
Mfr. Part No.EG-4-01
BrandRichco
TWD13
Each (In a Bag of 100)
units
6.4mm No.10, No.8 Nylon 6.6mm 7.75mm
RS Stock No. 507-3299
Mfr. Part No.EG-3-01
BrandRichco
TWD12
Each (In a Bag of 100)
units
4.8mm No.10, No.8 Nylon 6.6mm 7.75mm
RS Stock No. 507-3312
Mfr. Part No.EG-5-01
BrandRichco
TWD5
Each (In a Bag of 100)
units
7.9mm No.10, No.8 Nylon 6.6mm 7.75mm