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Needle Bearing
Needle Bearings Rnav4908-4912 – High-Load, Precision Roller Bearings
Basic Info
| Inner Diameter | 48 mm |
|---|---|
| Outer Diameter | |
| Thickness | 22 mm |
| Type | Needle Roller Bearing, Radial, Closed |
| Material | |
| Lubrication |
Introduction
RNAV4908 is a compact, high-precision needle roller bearing without inner/outer rings. Designed for radial loads, it features robust bearing steel construction, multiple precision and clearance options (P0–P2, C0–C4), and fast delivery (3–7 days). Ideal for OEM/ODM applications.7
Day Prototype
vs. 8-12 wks standard
50+
Countries Served
Global logistics network
12h
Quote Response
Expert engineers on call
Typical Applications
Wind Power
Mining
Steel & Metallurgy
Automotive / EV
Rail Transit
Precision Machinery
Genuine SKF Bearings
NDA Protected
Free Sample for Orders > $50K
Global Shipping
Product Details
Key Features & Technical Highlights
| Description | Value |
|---|---|
| Ultra-Compact Design | No inner/outer ring — saves radial space, ideal for tight assemblies |
| Precision Grades | P0, P6, P5, P4, P2 — meets aerospace & servo motor tolerances |
| High Load Capacity | Radial-only design with hardened bearing steel (GCr15) rollers |
| Sealed & Ready-to-Use | Closed-type construction — pre-lubricated with grease/oil, zero maintenance start |
| Standardized Dimensions | RNAV4908–RNAV4912 series: 48×62×22 mm (interchangeable per ISO 3580) |
| Global Compliance | HS Code 8482102000 — certified for EU, US, ASEAN import |
| OEM/ODM Support | Custom marking, packaging, and clearance (C0/C3/C4) available |
| Origin & Reliability | Made in China under strict SKF-aligned quality control (1M units/year capacity) |
| Application Range | Automotive transmissions, industrial gearboxes, printing presses, robotics joints |
| Why Choose Us? | SKF-trained technical team + real-time stock data — faster lead time (3–7 days) vs. generic suppliers |
FAQ: Are RNAV49xx bearings compatible with SKF NK/NKS series? Yes — identical dimensions and load ratings. Do they require additional cages? No — closed-type includes integrated cage & seals. What’s the max operating temperature? Up to 120°C with standard grease. Can they handle shock loads? Yes — optimized roller profile and hardened raceway (if mounted on shaft/housing).
Need exact specs, CAD files, or volume pricing? Send your inquiry now — our SKF-certified engineers reply within 2 hours.
Product Summary
- Product Name
- Needle Bearings Rnav4908-4912 – High-Load, Precision Roller Bearings
- Category
- Needle Bearing
- Brand
- SKF
- Certification
- ISO 9001 · TS 16949
- Lead Time
- 7 Working Days
Get a Custom Quote
Our engineers will respond within 12 hours with a tailored solution.
Request QuoteGeneral Specifications
| Bearing Type | Needle Bearing |
| Brand | SKF |
| Quality Standard | ISO 9001 / TS 16949 |
| Precision Grade | P0 / P5 / P6 (custom) |
| Material | Chrome Steel / Stainless |
| Cage Material | Steel / Brass / Polyamide |
| Lubrication | Grease / Oil (specify) |
| Operating Temp. | -40°C to +200°C |
| Min. Order Qty | 1 pc (samples available) |
| Prototype Lead Time | 7 Working Days |
Performance Parameters
| Load Capacity | Contact for C0/Cr values |
| Speed Rating | Contact for ndm limit |
| Vibration Level | Z1 / Z2 / Z3 (custom) |
| Noise Level | V1 / V2 / V3 (custom) |
| Fatigue Life | L10h per ISO 281 |
| Sealing Options | Open / Z / 2Z / RS / 2RS |
Custom Specifications Available
Our engineering team can modify bearing dimensions, materials, seals, and clearances to meet your specific operating requirements. Submit your drawing or spec sheet for a tailored proposal.
Wind Power
Main shaft bearings, gearbox bearings, and generator bearings for onshore and offshore wind turbines.
Mining & Quarrying
Heavy-duty bearings for crushers, conveyors, and rotary equipment in extreme dust and shock-load environments.
Steel & Metallurgy
High-temperature bearings for rolling mills, continuous casting, and furnace applications.
Automotive / EV
Wheel hub bearings, transmission bearings, and e-motor bearings for passenger and commercial vehicles.
Rail Transit
Axle box bearings, traction motor bearings, and gearbox bearings meeting EN/UIC railway standards.
Precision Machinery
High-precision spindle bearings, angular contact bearings, and super-precision bearings for CNC and robotics.
Application Design
EngineeringOur engineers analyze your operating conditions -- load, speed, temperature, environment -- and select or design the optimal bearing solution to maximize service life and reduce total cost of ownership.
Custom Modification
7-Day TurnaroundNeed non-standard dimensions, special materials, or modified clearances? We can modify standard SKF bearings or manufacture fully custom solutions with a 7-day prototype turnaround.
Failure Analysis
DiagnosticsWhen bearings fail prematurely, our team conducts root-cause analysis using advanced diagnostic tools to identify the failure mode and recommend corrective action.
Predictive Maintenance
Up to 40% Less DowntimeWe deploy vibration monitoring, thermal imaging, and oil analysis programs that detect bearing deterioration early -- reducing unplanned downtime by up to 40%.
On-site Installation
Global CoverageProper installation is critical to bearing performance. Our certified technicians provide on-site installation support, alignment verification, and operator training worldwide.
Lifecycle Support
Enterprise SLAFrom initial selection through end-of-life, our dedicated account managers provide scheduled maintenance plans, re-lubrication programs, and replacement forecasting for enterprise clients.
Why SKF China
The engineering partner advantage
7 Days
Prototype Lead Time
vs. 8-12 weeks via standard channels
15+
Certified Engineers
SKF-certified, on-call for your project
50+
Countries Delivered
Reliable global logistics network
Request a Quote
Get a custom quote for
Needle Bearings Rnav4908-4912 – High-Load, Precision Roller Bearings
NDA protected · Free samples for orders > $50K · Reply within 12 hours
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