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Gel and Oyster Grummets

Grummets are designed to seal between the bolts and bolt holes in pre-cast concrete, steel and cast iron segments.

They are resistant to the acids and alkalis found in ground water and are available in a range of different diameters and shapes.

Product Details

Oyster Grummets are normally supplied to suit metric bolts.
Nominal size and bolt diameter 20mm, 24mm, 30mm, 36mm.

Gel Grummets are manufactured for all imperial and metric bolt diameters used in tunnelling.
Gel Grummets are supplied in plastic sacks of 1000. Each 50 Grummets are threaded on a colour size coded string.

Datasheets and Brochures


Gel Grummets

Gel Grummets

Oyster Grummets

Oyster Grummets


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Ancillary materials, equipment & fittings for all types of tunnelling