30x48x8.5mm CNB Power Steering Oil Seal NBR Black In Stock Auto Parts
Model / SKU: CNB-30-48-8.5-NBR
This aftermarket CNB oil seal 30×48×8.5 mm uses NBR, black color, in stock, bulk discounts available, high-quality auto parts for power steering system. For importers, wholesalers and MRO buyers; lead time 7–15 working days — RFQ with size, qty and destination.
Tags: 30x48x8.5mm, CNB power steering oil seal, power steering seal, NBR oil seal, auto steering spare parts
Product photos
Key specs: Inner diameter mm: 30 | Outer diameter mm: 48 | Height mm: 8.5 | Material: NBR | Material: NBR | Structure: CNB1W11 | Color: Black | specifications: 30x48x8.5 mm
- Inner diameter mm: 30
- Outer diameter mm: 48
- Height mm: 8.5
- Material: NBR
- Material: NBR
- Structure: CNB1W11
- Color: Black
- specifications: 30x48x8.5 mm
- Material: NBR
- Structure: CNB1W11
- Color: Black
- Size: 30x48x8.5 mm
Technical summary
Product specifications. Refer to the approved drawing for dimensional tolerances and installation requirements.
| Spec | Value |
|---|---|
| Material | NBR |
| Structure | CNB1W11 |
| Color | Black |
| Size | 30x48x8.5 mm |
Pricing: request a quote (B2B / wholesale).
MOQ / commerce notes: Lead time 7–15 working days
Product details
This is an aftermarket CNB high-pressure power steering oil seal with dimensions 30×48×8.5 mm, made of NBR black rubber with yellow PTFE liner and garter spring, designed for automotive power steering system.
Ready stock available with bulk discounts, high-quality auto spare parts. Buyers should submit RFQ with ID×OD×height mm, quantity and destination; standard stocked sizes ship within 7–15 working days.
VKEFOT manufactures oil seals, O-rings and custom rubber seals in Xingtai and exports to Europe, North America, Middle East and Southeast Asia.
Features & Benefits
NBR nitrile rubber maintains stable sealing performance against standard automotive power steering hydraulic fluid.
CNB composite lip structure handles cyclic high hydraulic pressure and reduces fluid leakage on steering racks.
Built-in stainless steel garter spring keeps consistent lip contact pressure when pressure fluctuates in the hydraulic circuit.
Secondary dust barrier prevents grit, moisture and road contaminants from entering the steering gear assembly.
Integrated backup ring resists lip overturning under high hydraulic pressure during steering operation.
Verify shaft and bore dimensions before order; this item is aftermarket replacement and not genuine OEM component.
Factory production MOQ typically 100–5,000 pcs depending on tooling, material and process; this SKU quantity confirmed on quotation, lead time 7–15 working days.
FKM or HNBR compound upgrade is available for higher temperature or aggressive fluid media upon request.
OEM marking and neutral export carton packing can be arranged for bulk shipments.
Material & Process
- Sealing lip：NBR nitrile rubber; metal skeleton: carbon steel; garter spring: stainless steel; inner liner: yellow PTFE. Typical operating temperature range -30°C to +120°C for NBR. FKM/HNBR variant available for higher temperature service, confirm compound grade with RFQ.
Applications & Compatibility
Automotive power steering rack high pressure hydraulic sealing, aftermarket auto spare parts.
Aftermarket replacement. Verify shaft diameter and housing bore before order.
Selection & Installation
Selection Tips
Check ID 30 mm, OD 48 mm, thickness 8.5 mm, confirm rubber compound and working temperature before ordering.
Installation Steps
- Clean shaft and housing bore thoroughly, remove burrs, rust and old seal residue.
- Lubricate seal lip and shaft surface; dry installation is not permitted.
- Orient seal so spring side faces the hydraulic fluid side, press vertically with matching installation sleeve.
- Do not strike rubber body directly with hammer; apply even pressure on seal metal shell only.
- Press seal fully to seating depth, then manually rotate shaft to confirm free movement.
Packaging & Delivery
Neutral PE bag + export carton; typically 50–200 pcs per carton, adjustable.
Lead time 7–15 working days for this standard spec.
Factory production MOQ typically 100–5,000 pcs; this SKU quantity confirmed on quotation.
Samples and small trial lots for stocked sizes; freight confirmed on RFQ.
Custom order lead time 25–40 working days.
Payment, test reports and warranty confirmed on quotation / as agreed by lot.
Send an inquiry with size (ID×OD×height in mm), quantity, destination and duty for a firm lead time.
FAQ
I only have a competitor/OEM part number—can you cross-reference?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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?
Conclusion: 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 is this 30x48x8.5mm CNB oil seal used for?
This seal is a high pressure power steering oil seal, high quality auto spare parts for automotive power steering system, designed to retain hydraulic fluid and block external contaminants.
What are the OE numbers and full specifications for this seal?
Dimensions are 30×48×8.5 mm, CNB1W11 structure with NBR rubber. No matching OE number found for this exact size; verify dimensions before purchase.
Which vehicle fit this 30x48x8.5 power steering oil seal?
It is widely used for automotive power steering rack repair. Verify shaft and bore dimensions before order.