Molded O-Rings

The O-ring is a simple and versatile seal that can be used in thousands of applications. O-rings are manufactured in a wide variety of compounds to suit your every need.

Static Sealing
Most O-Rings are used in static service (the O-Ring and metal surfaces remain relatively fixed). They may be applied as face seals or radial seals. In face seal applications, the O-Ring should seat against the low pressure side of the groove.

Dynamic Sealing
The O-Ring moves relative to the mating surface. A moving seal may be further classified by the type of motion: reciprocating, oscillating, or rotating. The greatest number of dynamic seals are used in reciprocating service in cylinders, valves, and linear actuators. Oscillating motion is encountered in swivels and valve stems. When an O-Ring is used on a rotating shaft, it should be limited to light duty where the shaft speed is low and some fluid bypass is acceptable.

Materials
Buna-N, Viton, EPDM, Silicone, PTFE, Polyacrylate

Durometer Selection
70-durometer hardness should be used wherever possible as it offers the best combination of properties for most O-Ring applications. Softer compounds stretch easier and seal better on rough surfaces. Harder compounds offer greater abrasion resistance and resistance to extrusion.

Sizing Systems

AS568 Dash Sizes - Inch Sizes

Standard inch sizes ranging from 1/32" I.D. to 26" I.D.

AS568 Dash Size Chart

Boss Tube Fittings
O-Ring sizes for Boss Tube Fittings are available in both 70 & 90 Durometer. These O-Rings are used in applications to provide a seal for straight-thread tube fittings on a boss.

Numbering System: The two digits after the -9 represent the Tube Size O.D. in 16ths of an inch. For example -905 is sized for a Tube O.D. of 5/16". The one exception is for -901 where the Tube Size O.D. is 3/32".
Boss Tube Fitting O-Ring Size Chart

Metric Sizes
Standard metric sizes ranging from 1.50mm I.D. to 499.30mm I.D.

Metric O-Ring Size Chart

Custom Vulcanized O-Rings

O-rings custom manufactured for your specific application needs. Available in inch or metric cross sectional sizes and a wide range of materials.

O-Ring Kits

A wide variety of O-rings are standard in our kits, giving you the flexibility and the versatility to find the right fit for your situation.

Daemar's o-ring kits offer convenience and easy use, making them the ideal solution for maintenance applications. These kits are effective tools in reducing costs for maintenance and assembly staff by eliminating the guess work in part selection and saving time in part sorting.

DMRT Inch O-Ring Kits (ORK-2)
30 sizes and 382 rings. Sizes ranging from 006 (1/8" ID, 1/16" width) up to 327 (1-3/4" ID, 3/16" width). Buna 'N' material.

DMRT Viton Inch O-Ring Kit (ORK-1-V)
30 sizes and 382 rings. Sizes ranging from 006 (1/8" ID, 1/16" width) up to 327 (1-3/4" ID, 3/16" width). Viton material.

DMRT Metric O-Ring Kit (MORK-1)
32 sizes and 401 rings. Sizes ranging from 3mm ID and 1mm width up to 35mm ID 5mm width. Buna 'N' material.

DMRT Boss O-Ring Kit
20 sizes and 212 rings. Sizes ranging from the Boss 901 up to the 932. Buna 'N' material.

DMRT Quad-Ring Kits
36 sizes and 226 rings. Sizes ranging from 006 (1/8" ID, 1/16" width) up to 327 (1-3/4" ID, 3/16" width). Buna 'N' material.

DMRT Inch Splicing Kit (SPL-KT-BUNA)
Make your own custom o-ring for applications where a standard size o-ring won't fit. The kit contains a cutting blade, adhesive, and a splicing and cutting tool. 1 metre each of 0.070", 0.103", 0.139", 0.210" and 0.275". Buna 'N' material.

DMRT Metric Splicing Kit (SPL-KT-MET)
Make your own custom metric o-ring for applications where a standard size o-ring won't fit. The kit contains a cutting blade, adhesive, and a splicing and cutting tool. 1 metre each of 1.6mm, 2.0mm, 2.4mm, 3.0mm, 3.5mm, 4.0mm, 5.0mm, 5.7mm, and 8.4mm. Buna 'N' material.