NBR O-Ring
NBR (Nitrile Butadiene Rubber) O-rings are the most widely used sealing elements in industrial applications. Manufactured from high-quality nitrile rubber…
- Material
- Nitrile Butadiene Rubber (NBR)
- Hardness (Shore A)
- 70 ± 5
Custom & standard sealing manufacturer
Custom seals engineered for production.
From drawing or sample to repeatable production. We build non-standard rubber and PTFE sealing components around your media, temperature, pressure and volume.
Custom & standard
Engineering support
OEM / ODM supply
Custom manufacturing first
No standard part? Start with a drawing or sample.
Our core work is application-specific sealing: unusual profiles, compound selection, small batch prototypes, durable production molds and complete OEM/ODM programs.
Custom profiles and dimensions
Material and compound matching
Rubber-to-metal and PTFE combinations
Prototype through serial production
Explore custom engineering
Product capability
Explore proven product families, then adapt the dimensions, material and documentation to your application.
01
O-Rings & X-Rings
NBR, silicone, FKM, FFKM and X-ring options for static and dynamic sealing.
02
Rotary Shaft Oil Seals
Skeleton and double-lip oil seals for gearboxes, pumps, motors and rotating equipment.
03
Hydraulic Seals
U-rings, Y-rings, V-rings, wipers and combined seals for reciprocating systems.
04
Guide & Wear Rings
PTFE, bronze-filled PTFE, nylon and PTFE-energized components for cylinder guidance.
05
Custom & Non-Standard Seals
Diaphragms, covered rings, spring-energized seals, PU parts and non-standard molded components.
Selected products
A practical starting point for common sealing requirements
FKM O-Ring (Fluorocarbon)
FKM (Fluorocarbon / Viton) O-rings provide superior resistance to high temperatures, chemicals, oils, and fuels. With excellent aging and ozone resistance…
- Material
- Fluorocarbon Rubber (FKM / Viton)
- Hardness (Shore A)
- 75 ± 5
X-Ring (Star Ring)
X-rings (also known as star rings or quad rings) feature a four-lobed cross-section design that provides lower friction and better sealing performance tha…
- Material
- NBR / FKM / Silicone (optional)
- Hardness (Shore A)
- 70 ± 5
Application engineering
From operating conditions to a production-ready seal.
We help narrow the material, profile and dimensions before tooling or volume commitments. The process is built for OEM programs, distributor ranges and maintenance replacements.
Material shortlistingMedia, temperature and pressure review.
Sample validationEvaluate fit and function before production.
OEM / ODM supportDrawing review, molds, labeling and packaging.
Material fit
NBRHNBRXNBREPDMVMQIndustry focus
Sealing performance where downtime matters
The material conversation changes by process. Match the product to the environment rather than a single universal compound.
01
Contamination control
Semiconductor
Protect wafer-processing equipment from aggressive chemistry, plasma and particle contamination.
Explore 02 Clean processingBiopharmaceutical
Support sanitary equipment, filtration and sterile processing with materials matched to cleaning and contamination controls.
Explore 03 Hygienic operationFood & Beverage
Keep filling, pumping and packaging equipment sealed through frequent cleaning and product changeovers.
Explore 04 Process uptimePhotovoltaics
Seal solar manufacturing equipment and outdoor module hardware against heat, humidity and aging.
Explore 05 Chemical resistanceWater Treatment
Maintain reliable sealing across pumps, valves, filters and chemical-dosing equipment.
Explore 06 Reliable replacementIndustrial Equipment
Keep hydraulic, rotary and production machinery operating in demanding, high-cycle service.
Explore
100Kcleanroom grade
Inside Cletus
A manufacturing partner built for repeatability.
Our Jingjiang facility brings production, mold making, inspection and customer support into one quality-controlled workflow. The team supports both catalog supply and application-specific development.
ISO 9001:2015 quality system
Class 100,000 cleanroom area
Dedicated mold room
Export packing and documentation
Meet the company
How we work
A clear path from brief to shipment
01
Share the application
Send drawings, dimensions, samples, media, temperature and pressure details.
02
Select the material
We compare elastomer or polymer options against the operating conditions.
03
Confirm the sample
Prototype and evaluate fit, material and sealing performance before volume production.
04
Produce and ship
Production follows the approved specification, with packing and export documents agreed upfront.
Technical notes
Useful guidance for better sealing decisions
How to choose the right O-ring material for demanding service
A practical starting point for comparing NBR, silicone, FKM and FFKM against media, temperature and pressure.
Read article
FFKM vs FKM: choosing a seal for aggressive processes
Both materials are high-performance elastomers, but the right choice depends on chemistry, temperature and process risk.
Read article
A practical checklist for preventing hydraulic seal failure
Most failures trace back to contamination, installation damage, poor alignment or a mismatch between the seal and its operating conditions.
Read articleStart a conversation
Send the application.
We will help define the seal.
For the fastest response, include a drawing or sample photo, the media, operating temperature, pressure, dimensions and estimated annual quantity.