NBR
A common general-purpose choice for many mineral oils and industrial duties. Confirm temperature and fluid compatibility.
Sealing products from one source
Send a reference, sample, photograph or measurements
Bridge Engineering supplies rotary oil seals, O-rings, V-rings and related shaft-repair products for industrial maintenance, repair and OEM applications.
Where the original reference is unclear, send the dimensions, operating medium, temperature, shaft speed and a clear photograph. We will help identify a suitable starting specification and confirm availability.
Reading an oil seal marking
What “TC 35 × 52 × 7” usually tells you
35 × 52 × 7 mm normally describes the shaft diameter, housing bore and seal width. TC is commonly used for a rubber-covered, spring-loaded double-lip profile, but profile codes can vary between manufacturers.
Photograph the complete marking and both faces of the seal. Include the case style, lip arrangement, spring, rotation direction and application so we can confirm the correct construction rather than relying on the code alone.
Material selection
Match the elastomer to the fluid, temperature and duty
The material is as important as the size. These are useful starting points; the final choice must be checked against the exact medium, temperature, pressure, speed and manufacturer data.
FKM
Often selected for higher temperatures and improved resistance to many oils, fuels and chemicals. Check the precise fluid and grade.
EPDM
Commonly considered for water, steam and some brake-fluid duties. It is generally unsuitable for petroleum oils.
Silicone
Useful where temperature flexibility matters, although abrasion and tear resistance can limit some dynamic applications.
PTFE
Used for low friction, chemical resistance and specialist duties. Seal design and installation requirements need careful confirmation.
Always verify: material families contain different compounds and grades. Send the fluid name, concentration and working temperature for a checked recommendation.
Oil Seals
Metric and imperial rotary shaft seals, including common single-lip, double-lip, rubber-covered and metal-cased designs.
- NBR, FKM and specialist materials
- Dust lips and exclusion features
- Replacement by dimensions or marking
- Wear sleeves for damaged shaft surfaces
O-Rings
Standard and specialist O-rings for static and dynamic sealing, supplied by reference, inside diameter and cross-section.
- Metric and imperial references
- NBR, FKM, EPDM, silicone and more
- Application and fluid compatibility guidance
- Use the finder below for a closest-size match
V-Rings
All-rubber axial shaft seals that fit onto the shaft and seal against a perpendicular counterface.
- VA, VS, VL and VE profiles
- NBR and FKM options
- Contamination exclusion and seal protection
- Selection by profile and shaft size
Oil Seal Identification
Measure Shaft × Housing × Width
The most useful starting point is the three boundary dimensions, followed by the visible lip arrangement, case construction and application conditions.
Measure the surface the sealing lip runs on.
Measure the outside diameter of the seal or housing bore.
Measure the overall axial width of the seal.
Note the marking, lip count, spring, dust lip and case style.
Example enquiry format
“35 × 52 × 7 mm, rubber-covered, spring-loaded main lip with dust lip, sealing gearbox oil.”
V-Ring Profile Guide
VA versus VS: measure more than the shaft diameter
VA and VS are V-ring profile designations, not O-ring types. A shaft diameter alone may not distinguish the profiles, so compare the body proportions and send a side-profile photograph.
Common standard profile used across general industrial drives, motors and gearboxes.
A wider-bodied profile used where the VS design is specified; confirm body dimensions as well as shaft size.
Compact profile for restricted spaces and applications where a narrow V-ring is required.
Heavy-duty, large-diameter profile often used as additional protection for a primary seal.
Heavy-duty large-diameter design that can be clamped to the shaft for demanding arrangements.
O-Ring Finder
Identify the Closest O-Ring Size
Enter your measurements to find the closest matching O-ring sizes to AS568 / ISO 3601-1 references and metric dimensional suggestions.
The finder searches verified AS568 / ISO 3601-1 Class A dash sizes 001–050 and 102–178, plus dimensional metric suggestions. Send the application details so material and final suitability can be checked.
1. Enter measurements
Measure an unstretched ring with vernier calipers where possible.
Important: Size identification does not confirm compound, hardness, chemical compatibility, pressure rating or fitness for service.
2. How to measure
Measure straight across the inside of the relaxed ring.
Measure the thickness of the ring cross-section.
Measure straight across the outside of the ring.
Tip: Always measure an unstretched, relaxed O-ring for best results.
3. Closest matches
Enter at least two measurements, or enter ID and cross-section.
No measurements entered yet.
4. Next steps
Selected size:Complete a search to select a result
Need help?Not sure which material or size is right?
Call our team0161 304 7800
Email ussales@bridge-engineering.net
Request a quote →Reference results are an identification aid only and must be checked against manufacturer data before purchase or installation.
Frequently Asked Questions
Useful Information Before You Enquire
What details are needed to identify an oil seal?
Provide the marking where visible, shaft diameter, housing bore, seal width, lip arrangement, case style, operating fluid, temperature, shaft speed and clear photographs.
Can the O-ring Finder confirm the correct material?
No. The finder helps identify a closest reference size. Compound, hardness, chemical compatibility, pressure and final suitability must be confirmed separately.
Are VA and VS O-rings?
No. VA and VS are V-ring profile designations. Compare the side profile and measure body width and overall height as well as shaft diameter.
Can Bridge Engineering source V-rings and shaft-repair sleeves?
Yes. We can source common V-ring profiles, specialist sizes and suitable wear sleeves where a shaft sealing surface is worn.
Need help identifying a seal?
Send the dimensions and a photograph
We will help identify the likely seal type, profile and replacement options before quoting.