O-Ring Kits
O-Ring Kits are comprehensive assortments of circular rubber seals designed to create secure, leak-proof connections in hydraulic, pneumatic and mechanical systems. Each professional-grade kit contains a carefully selected range of industry-standard sizes manufactured from high-performance elastomers including Nitrile (NBR) and FPM (Fluorocarbon/Viton) rubber. These kits serve as essential maintenance tools for workshops, service centres and manufacturing facilities, providing immediate access to the most commonly required seal sizes for emergency repairs, preventative maintenance and system installations.
O-Ring Kit Specifications
Kit Contents: 510 individual O-ring seals per kit
Available Materials: Nitrile rubber (NBR) or FPM rubber (Viton equivalent)
Shore Hardness: 70 Shore A or 75 Shore A options
Size Standards: Metric (BS4518) or Imperial (BS1806) measurements
Temperature Range: -40°C to +135°C (NBR), -20°C to +200°C (FPM)
Storage Case: Durable organized case for easy identification and transport
Special Options: Food grade rubber O-rings available on request for FDA-compliant applications
How to Measure O-Rings
Accurate O-ring measurement is crucial for proper sealing. Follow these steps:
- Inside Diameter (ID): Lay the O-ring flat on a surface and use digital callipers to measure straight across the inner edges from one side to the other
- Cross-Section (CS): Measure the thickness of the rubber at the side of the O-ring using callipers
- Outer Diameter (OD): Optional - measure across the outer edges (OD = ID + 2 × CS)
Pro Tip: For stretched or damaged O-rings, measure multiple points and take the average for accuracy. If unsure, our technical team can assist with identification - call 01233 713581.
O-Ring Materials Guide
Nitrile O-Rings (NBR)
Nitrile rubber O-rings offer excellent resistance to petroleum-based oils, hydraulic fluids and fuels, making them the most popular choice for general industrial applications. Ideal for:
- Hydraulic systems and cylinders
- Pneumatic equipment
- Automotive applications
- General engineering sealing
FPM O-Rings (Fluorocarbon/Viton)
FPM rubber O-rings provide superior chemical resistance and high-temperature performance, suitable for demanding applications including:
- Chemical processing equipment
- High-temperature environments
- Aggressive fluid exposure
- Automotive fuel systems
Food Grade Rubber O-Rings
For food processing, beverage, pharmaceutical, and medical applications, we supply food grade rubber O-rings manufactured to meet FDA regulations (FDA 21 CFR 177.2600) and EU 1935/2004 standards. Our food safe o rubber rings are available in:
- Food Grade Silicone: Excellent for low/high temperatures, tasteless and odourless, ideal for dairy and beverage processing
- FDA Approved EPDM: Superior for hot water, steam sterilization and CIP (clean-in-place) applications
- White Nitrile (FDA NBR): Oil-resistant food grade rubber suitable for food handling equipment
- Food Grade FKM: High-temperature food contact applications requiring chemical resistance
Shore Hardness Explained
70 Shore A: Softer durometer offering better sealing at lower compression forces - ideal for static seals and low-pressure applications
75 Shore A: Firmer durometer providing enhanced extrusion resistance - recommended for dynamic seals and higher pressure systems
Common O-Ring Applications
Our O-Ring Kits are extensively used across multiple industries for critical sealing applications:
- Hydraulic Systems: Cylinder seals, valve seals, pump seals, and hose connections
- Pneumatic Equipment: Air cylinder seals, fitting connections, and compressor components
- Automotive: Engine seals, transmission components, air conditioning systems, fuel injectors
- Plumbing: Tap washers, valve seals, pipe fittings, and water filtration systems
- Food & Beverage: Food grade rubber seals for processing equipment, bottling lines, dispensing systems
- Pharmaceutical: FDA-compliant seals for manufacturing equipment and sterile processing
- Industrial Machinery: Gearbox seals, bearing housings, and rotating shaft applications
- Manufacturing: Production equipment, assembly line machinery and automated systems
Whether you're maintaining hydraulic systems, servicing automotive components, or managing industrial equipment, our O'Ring Kits provide the reliability and convenience your operations demand. With comprehensive size ranges and premium materials, these kits ensure you have the right seal for every application. If you need assistance selecting the right size or would like to discuss custom options, contact our expert team at 01233 713581.
Frequently Asked Questions
Need your parts tomorrow? Our rapid same day dispatch has got you covered! Simply place your order before 4pm Mon-Thurs or 2pm Friday and select our Next Day Delivery service in the shopping cart. We also offer Guaranteed AM delivery when required, in addition to a Saturday delivery option.
If you don't mind waiting, we have a Free delivery method for orders over £30, and an economic £4.85 2nd Class delivery for orders between £20-£30.
Free Samples can be requested through our product pages, displayed in the sizing table beside the product you require. Please note you can always give us a call on 01233 713 581 or contact us on Live Chat to discuss samples.
You do not need to sign up to place an order, but it is recommended if you'd like to gain loyalty points, giving discount off future orders. To learn more about loyalty points, please view our rewards scheme page.
If you're unsure which part you need then please do not hesitate to give one of our friendly Sales Team a call on 01233 713 581 and they can assist you. Alternatively, we're active on Live Chat during office hours. You can open this using the button in the bottom right corner of the website. Alternatively, you can write to us using our contact form.
We offer a return period on all of our products to give you peace of mind, to view our policies and learn more about this process should it be required, please see our returns policy page.
In most cases we have the facilities to offer you different colours of a product, specific to your requirements. Minimum order quantities may apply depending on the manufacturing technique in question, but please get in touch with any queries you may have.
Please note that there is a minimum order value of £10 through our website (inclusive of VAT).
If you're new to our website you may want to check out our frequently asked questions section for answers to common customer queries.
While browsing the website you may come across abbreviations used for material names that you are unfamiliar with. You can find an explanation for these in our material abbreviations guide.