Our Products - ‘O’ Rings
 O Ring Product Dimensions
’O’Rings are torus-shaped (i.e. doughnut-shaped) objects made from elastomeric compounds such as natural or synthetic rubber, and are used to seal mechanical parts against fluid movement (air or liquid).
O-Rings perform their sealing action by deforming to take the shape of their cavity, after being oversized to guarantee an predetermined interference fit.
O-Rings are inserted into cavities defined as glands and are typically used in one of two seal designs, axial or radial. These seal designs along with their gland geometries are shown in the below schematic
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An O-Ring is specified by its inner diameter, its cross-section diameter, its material hardness/durometer (typically defined by the Shore A hardness), and its material composition.
In order for an O-Ring to seal against the movement of fluid, it must be compressed when seated inside the gland. A standard set of design guidelines exist to determine the proper O-Ring dimensions for radial and axial seals of a given dimension.
Rhondama hold stocks of most commercially available
O-Rings in both Metric and Imperial sizes, available in the following materials:-
Nitrile Butadiene, Silicone, PTFE, Ethylene Propylene, Neoprene, Viton Flurocarbon, Fluorosilicon and Polyurethane.
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We offer Food Quality approved material ‘O’Rings, certified to FDA standards and supply to the Aerospace Industry, in conformity with British Standards Institution Documents reference 3F68 & 2F69.
Our Products - Contoured Back-Up Rings
Imperial & Metric sizes covering all Standards including bespoke sizes to your drawings.
Delivery is between 1-7 days. Scheduled orders are welcomed. Please ask for sizes not listed.
Most popular materials are offered:-
| NBR |
POM |
| FPM |
UHMWPE |
| Polyurethane |
ECOMID |
| EPDM |
NYLON |
| Silicone |
+ FDA MATERIALS |
| PTFE |
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Shore Hardness 75°-96° Shore
Click here to view the Contoured Back-Up Ring data sheets.
Our Products - Back-Ups (standard, angled and contoured)
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RST 108
BACKUP RING |
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RST 109
CONTOURED BACKUP RING |
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RST 110
ANGLED BACKUP RING (OUTER) |
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RST 111
ANGLED BACKUP RING (INNER) |
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RST 112
ANGLED BACKUP RING (INNER) |
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RST 113
TRIANGULAR BACKUP RING (OUTER) |
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Click here to view our Manufacturing data sheets.
Click here to go to our Manufacturing enquiry form
Send us an enquiry
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