NBR Black O-Rings | Nitrile Rubber O Ring Seals | Industrial & Automotive Use
Model / SKU: nbr-black-o-ring-std
Premium NBR nitrile rubber black O-rings with excellent oil resistance and wear resistance. Available in a full range of standard sizes (metric & AS568 imperial), widely used for hydraulic systems, pneumatic devices, automotive parts, industrial machinery and pipeline sealing. Factory direct supply with large stock, ideal for industrial distributors, hydraulic parts suppliers, auto repair workshops and cross-border bulk procurement.
Tags: NBR black O ring, nitrile rubber o seal, industrial o ring seal, oil resistant o ring, assorted size o ring, hydraulic o ring seal, automotive rubber seal, factory direct o ring
Product photos
Key specs: Material: NBR | Material: NBR (nitrile butadiene rubber) | Color: Black | Hardness: 70±5 Shore A | Standard: ISO 3601 | Size range: Full metric & imperial sizes available | Type: Static & dynamic sealing element | Application: Hydraulic, pneumatic, automotive, industrial sealing
- Material: NBR
- Material: NBR (nitrile butadiene rubber)
- Color: Black
- Hardness: 70±5 Shore A
- Standard: ISO 3601
- Size range: Full metric & imperial sizes available
- Type: Static & dynamic sealing element
- Application: Hydraulic, pneumatic, automotive, industrial sealing
- specifications: AS568 compliant
- Material: NBR (nitrile butadiene rubber)
- Color: Black
- Hardness: 70±5 Shore A
Technical summary
Product specifications. Refer to the approved drawing for dimensional tolerances and installation requirements.
| Spec | Value |
|---|---|
| Material | NBR (nitrile butadiene rubber) |
| Color | Black |
| Hardness | 70±5 Shore A |
| Standard | ISO 3601 |
| Size range | Full metric & imperial sizes available |
| Type | Static & dynamic sealing element |
| Application | Hydraulic, pneumatic, automotive, industrial sealing |
| Size | AS568 compliant |
Pricing: request a quote (B2B / wholesale).
Product details
These NBR black O-rings are high-performance general-purpose sealing elements manufactured from premium grade nitrile rubber compound. They feature excellent resistance to petroleum oils, hydraulic fluids, lubricating greases and water, with good wear resistance and aging stability for long service life.
Available in a complete range of standard metric sizes and AS568 imperial sizes, they are widely applied in hydraulic systems, pneumatic cylinders, automotive engines and chassis, industrial valves and pipelines, agricultural machinery and general mechanical equipment for both static and dynamic sealing applications.
Produced under ISO 9001 quality management system with precision molding and flash trimming process, they deliver consistent dimensional accuracy and reliable sealing performance. We maintain large stock of standard sizes to support fast delivery and volume procurement, serving global industrial distributors, hydraulic parts suppliers and automotive aftermarket channels.
Core value for buyers
- Full range of standard sizes, ready for immediate delivery
- Factory direct bulk pricing, cost-effective for large sourcing
- Stable quality consistency for industrial and automotive applications
- Flexible customization for special size and packaging requirements
Material and process
- Material：Premium grade NBR (nitrile butadiene rubber)
- Color：Black
- Hardness：70±5 Shore A (other hardness available on request)
- Key performance：Oil resistant, wear resistant, water resistant, anti-aging, good compression set resistance
Working temperature range: -30℃ ~ +120℃ (standard NBR 70) - Compatible media：Hydraulic oil, gear oil, lubricating grease, water, general weak acid & alkali
Manufacturing process
Compression molding production
Precision flash trimming for smooth surface
Dimensional inspection per batch
Quality control aligned with ISO 3601 sealing standards
Upgrade option：FKM (viton) O-rings available for high temperature and chemical resistance requirements
Application and compatibility
- Product Type：General-purpose NBR O-ring seals for industrial and automotive use
- Available sizes：Full metric sizes & AS568 standard imperial sizes
- Compatible media：Hydraulic oil, engine oil, gear oil, lubricating grease, water, general hydraulic fluids
Typical applications
Hydraulic system cylinder and valve sealing
Pneumatic equipment and component sealing
Automotive engine, chassis and transmission sealing
Industrial pipeline and valve static sealing
Agricultural machinery and equipment sealing
General mechanical static and dynamic sealing
Suitable for：Industrial parts distributors, hydraulic & pneumatic suppliers, auto repair workshops, equipment maintenance departments, cross-border industrial parts traders
Buyer notice：Please confirm required size (ID / cross section), working condition and media before ordering. Select appropriate material and hardness for specific working conditions.
Selection guide
Selection Guide
- Confirm required inner diameter and cross-section thickness, select standard metric or AS568 imperial size.
- Standard NBR 70 Shore A is suitable for most general hydraulic, automotive and industrial applications within -30℃~120℃.
- For high temperature or strong chemical conditions, select FKM material upgrade.
- For bulk project requirements, contact us for exclusive volume pricing.
Installation Steps
Surface Preparation
Thoroughly clean the installation groove and sealing surface, remove burrs, dirt and residual impurities.
Pre-lubrication
Apply compatible lubricating oil or grease evenly on the O-ring and groove surface to avoid cutting during installation.
Installation
Place the O-ring into the groove smoothly, avoid twisting, stretching or scratching with sharp edges.
Post-installation Check
Confirm the O-ring is properly seated in the groove without twisting, extrusion or damage.
Packaging and delivery
Inner packaging：Sorted by size in sealed poly bags, size marking available.
Outer packaging：Standard export corrugated carton with moisture-proof lining. Custom packaging with private label available.
Packing quantity：Adjustable per bulk order requirements.
MOQ：No minimum order for stock sizes; sample orders supported for quality evaluation.
Lead time
Stock sizes：Ship within 2-5 working days after payment
Custom size orders: 25-40 working days
Large volume bulk orders: Lead time to be confirmed based on quantity
Custom services：Private label printing, custom packaging design, consolidated shipping for mixed sizes
Shipping terms：EXW, FOB, CIF available
Export documents：Commercial invoice, packing list, certificate of origin, material test report available on request
FAQ
I only have a competitor/OEM part number—can you cross-reference?
Yes. Send the reference PN, ID×OD×height in mm, and duty (media, temperature, pressure, speed). We match equivalents in the catalog; the Cross Reference page also searches by keyword. Final selection follows drawing and duty confirmation — do not order from a photo alone.
Do you support OEM/ODM, private packing and marking?
Yes — OEM/ODM from drawings or samples, plus agreed packing and marking. Share target-market compliance needs and annual volume; RFQ confirms process, tooling cost and cadence. VKEFOT is the export brand of the Xingtai factory, not a trading desk.
TC vs TB oil seal: which should I specify?
For a rotary shaft that needs a dust lip plus oil lip, start with TC (rubber-covered dual-lip is common); TB is typical when a semi-metal case needs a stiffer bore fit. Shaft diameter, housing, runout and dust still decide. Send ID×OD×height in mm and speed on the RFQ — not only a competitor photo.
NBR vs FKM oil seal for hot engine oil?
Continuous engine-oil duty near 120°C or fuel exposure should be reviewed as FKM; general mineral oil at moderate temperature and cost-sensitive repair jobs often stay NBR. Brown color is not proof of FKM. The quote names the grade and temperature limit — do not order by color.
Oil seal vs O-ring: when do I use which?
Use a metal-cased radial shaft (skeleton) oil seal for rotating shafts; use an O-ring for static glands or reciprocating grooves. An O-ring on a rotary shaft wears out quickly. VKEFOT makes both — state motion type (rotary/static/reciprocating) and ID×OD×section on the RFQ.
Cassette seal vs dual-lip TC for dusty construction equipment?
Ag gearboxes and construction travel shafts with mud and long service intervals should be reviewed as cassette/combined seals; many automotive hub repair jobs stay dual-lip TC. Cassette packs are thicker and need different bore and axial space. A job-site photo is not enough — send ID×OD×height.
Xingtai oil seal factory vs trading company — how do I tell?
VKEFOT is the export brand of Xingtai Hanchi Intelligent Technology Co., Ltd. Mixing, vulcanization and outgoing inspection run in Xingtai, then goods export to Europe, North America, the Middle East and Southeast Asia. A trading desk usually cannot change compound or cut tooling. For OEM drawings, ask who runs the process and QC — not only catalog price.
What is a skeleton / radial shaft oil seal?
A skeleton oil seal is a metal-cased radial shaft seal: the rubber lip rides the shaft and the case holds interference in the bore. Common styles include TC, TB and TA. Minimum spec is ID×OD×height in mm, compound and duty. VKEFOT catalogs automotive and industrial shaft seals; trust the product-page dimensions.
What do ID, OD and height mean on an oil seal RFQ?
ID is inside diameter (shaft), OD is outside diameter (bore), height is axial width, all in millimetres. Missing any one blocks a cross-reference. Example: 56×112×8/10 means 56 mm ID, 112 mm OD, 8/10 mm height. Put those three numbers and the compound on the RFQ.
Which oil seal for an automotive wheel hub or differential pinion?
Hub repair jobs often use dual-lip TC; differential pinion shafts often need a secondary lip or split height (e.g. 8/10 or 12/22 mm). Use measured or OEM dimensions — not a marketplace title. VKEFOT application pages cover drivetrains and hubs; send an OEM number or ID×OD×height on the RFQ.
How to select oil seals for ag gearbox and PTO shafts?
Ag gearboxes and PTO shafts see dust and shock — prefer a dust lip or cassette, with NBR or FKM matched to gear oil and temperature. Do not force a passenger-car hub seal onto a PTO shaft. Send shaft, bore, height and whether mud/water is present, then RFQ.
What matters for pump, valve and compressor shaft seals?
Match media (oil, water, gas) and temperature first, then lip style and compound; do not default to cheap NBR for high speed or dry running. Put shaft runout and eccentricity on the RFQ. VKEFOT application cases include pumps, valves and compressors — still use measured sizes.
Does a brown oil seal mean it is FKM?
No. Brown NBR is common; color is not proof of FKM. For heat or fuel duty, write temperature and media on the RFQ so the factory names the grade. Ordering by color is a frequent cause of early leak.
Can you quote an oil seal from a photo only?
Not as a firm quote. We need at least ID×OD×height in mm, ideally compound and speed. A photo can show lip count and case style; it does not replace dimensions. Incomplete RFQs get a request for those three numbers before price.
If a new oil seal leaks quickly, is it always a bad seal?
Not always. Rough shaft finish, runout, cocked installation or the wrong compound also leak early. Check size and media/temperature match before blaming the part, then inspect the journal. Note time-to-fail (e.g. 50 hours) on the RFQ so we diagnose — do not just buy a cheaper seal.
What is needed for private-label OEM packing of oil seals?
Private packing and marking need annual volume, target-market compliance and artwork; tooling cost and cadence are confirmed on the RFQ — not a one-line “please OEM”. VKEFOT runs OEM/ODM after drawings or samples are complete.
Who is VKEFOT and how does it relate to Xingtai Hanchi?
VKEFOT manufactures oil seals, O-rings and custom rubber seals in Xingtai and exports to Europe, North America, Middle East and Southeast Asia. The manufacturer is Xingtai Hanchi Intelligent Technology Co., Ltd. Use this wording on quotes and certificates — do not invent alternate spellings of the brand.
What material are these black O-rings made of?
They are made of premium grade NBR (nitrile butadiene rubber), hardness 70 Shore A, with excellent oil and wear resistance.
What sizes of NBR O-rings do you offer?
We offer a full range of standard metric sizes and AS568 imperial sizes. Custom special sizes are also available on request.
What are NBR O-rings used for?
They are widely used for hydraulic systems, pneumatic devices, automotive parts, industrial valves, pipelines and general machinery sealing.