Nitrile Rubber O Ring Cord 5mm Diameter (Black, 70 Duro, Per Metre)

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Below are the available bulk discount rates for each individual item when you purchase a certain amount

Buy 5 - 9 and pay only $3.45 each
Buy 10 - 24 and pay only $3.28 each
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  • Info Image for our Nitrile Rubber O Ring Cord 5mm Diameter (Black, 70 Duro, Per Metre); Precision rubber cord for making general purpose O Rings
  • A precision extruded round rubber cord used for making O rings. Our Nitrile Rubber O Ring Cord is black, has a hardness of 70 Duro and exhibits good resistance to fuels, greases and mineral oil fluids.
Inc. GST
Frequently bought together:


  • Precision extruded rubber cord for manufacturing O rings and seals
  • Excellent resistance to hydrocarbon fuels, greases, water and mineral oil based fluids
  • Good mechanical properties, flexibility and very easy to work with

Nitrile Rubber O Ring Cord is one of the most commonly used materials for making custom sized O rings. This particular cord is extruded from 70 Durometer Nitrile Rubber Compound which is also often referred to as NBR (Nitrile Butadiene Rubber). 

Nitrile Rubber is often used because of its combination of resistance to hydrocarbon fuels, mineral oils and greases as well as its excellent flexibility and sealing performance. This cord can be easily shaped and provides good, long lasting seal performance.

O Ring Cord is a simple, round, rubber extrusion. It is usually cut to length with both ends then joined with a super glue (or another adhesive) to make an O Ring. This is often done when custom sized O rings are urgently required or when the size of the ring makes arranging a fully moulded O Ring impractical.

O Rings made using our Nitrile Rubber O Ring Cord will exhibit the sealing capabilities of the nitrile rubber. Thus, you can expect them to withstand temperatures between -20°C and +90°C and offer excellent resistance to fuels, mineral oil based fluids, greases and water. Nitrile is typically not used for sealing aromatic hydrocarbons or brake fluid. 

One thing to be aware of when making O rings with Nitrile or any other material, the O Ring will only be as strong as its weakest point; which is often the adhesive join. We’re pleased to be able to offer a complete range of high quality, German-engineered super glues to use to make strong, high performance O Rings. 

For Nitrile O Ring Cord, top picks include VA 30 Rubber Filled Super Glue and VA 8406 Industrial Strength Super Glue. Both will create a join that has a strength rating above material fracture point (which means the O Ring Cord will break before the adhesive join does). More information on these and the other quality cyanoacrylate adhesives in our range is available here.

Dowloands & Resources

Nitrile Rubber O Ring Cord, Black, 70 Duro Specifications.

Colour Black
Polymer NBR (Nitrile Butadiene Rubber)
Hardness 70 Shore A (+/- 5) Durometer
Continuous Operating Temperature -20°C to 90°C
Potable Water Approved No
Food Grade Approval No
Hydrocarbon Fuel Resistance Excellent
Grease Resistance Excellent
Oil Resistance Excellent
Water Resistance Good
Dilute Acid Resistance Good
Concentrated Acid Resistance Poor
Aromatic Hydrocarbon Resistance Poor
Brake Fluid Resistance Poor



Cross Sectional Tolerances for Nitrile Rubber O Ring Cord (70 Duro)

We are pleased to offer Nitrile O Ring Cord manufactured in accordance with RMA Class E1 High Precision Tolerance requirements. This is the highest standard for O Ring Cord Tolerances which ensures that your O Ring Cord will be properly sized to meet the needs of your application.

RMA E1 (High Precision) Tolerance Specifics
Cord Diameter (mm) Tolerance (mm) Cord Diameter (Inch) Tolerance (Inch)
0.0 - 1.5 ± 0.15 0.000 - 0.060 ± 0.006
1.5 - 2.5 ± 0.20 0.060 - 0.100 ± 0.008
2.5 - 4.0 ± 0.25 0.100 - 0.160 ± 0.010
4.0 - 6.3 ± 0.35 0.160 - 0.250 ± 0.014
6.3 - 10 ± 0.40 0.250 - 0.390 ± 0.016
10 - 16 ± 0.50 0.390 - 0.630 ± 0.020
16 - 25 ± 0.70 0.630 - 0.980 ± 0.027

Quick Links to Related Categories and Solutions

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Additional Information

Minimum Continuous Temperature:
Maximum Continuous Temperature:
Shore Hardness:
70 Shore A
Food Grade / Potable Water Approvals?:
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