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Needle Bearing
NAK Needle Roller Bearings Rnav4903-4907, High Load Capacity
Basic Info
| Inner Diameter | 22 mm |
| Outer Diameter | 30 mm |
| Thickness | 13 mm |
| Type | Needle Roller Bearing, Closed, Radial Bearing |
| Material | |
| Lubrication | Grease or Oil |
Introduction
RNAV4903 is a compact, high-precision needle roller bearing without inner/outer rings. Designed for radial loads, it features compact dimensions (22×30×13 mm), P0–P2 precision options, C0–C4 clearance, and OEM/ODM service. Made in China, delivered in 3–7 days.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 Specifications & Advantages of RNAV4903–RNAV4907 Needle Roller Bearings
| Description | Core Value |
|---|---|
| Ultra-compact design (e.g., 22×30×13 mm) | Maximizes space efficiency in tight assemblies — ideal for automotive transmissions, gearboxes, and compact industrial actuators |
| Radial load-only, high-load capacity needle rollers | Delivers 2–3× higher radial load rating vs. deep groove ball bearings of same footprint |
| Bearing steel (GCr15) with precision ground raceways | Ensures exceptional hardness (HRC 60–64), wear resistance, and fatigue life |
| No outer/inner ring design | Reduces weight & cost; enables direct mounting on hardened shafts/housings — saves assembly time |
| Closed-type sealed construction | Prevents contamination ingress and retains grease — extends service life without relubrication |
| P0–P2 precision grades & C0–C4 clearance options | Supports high-speed, low-vibration applications (e.g., CNC spindles, robotics joints) |
| Grease or oil lubrication compatible | Flexible maintenance: pre-lubricated for life or field-replenishable via grease nipple |
| ISO/ABEC-certified manufacturing (HS Code 8482102000) | Meets global OEM quality standards — backed by 1M units/year production capacity & strict QA |
| BDL-branded, made in China (RoHS compliant) | Cost-optimized alternative to SKF NK/NKL series — identical fit, form, function; full interchangeability |
| 3–7 day lead time + OEM/ODM support | Faster delivery than premium brands — plus custom engraving, packaging, and spec tuning |
FAQ: Are RNAV4903–4907 interchangeable with SKF NK49/22, NK49/28? Yes — same dimensions, load ratings, and mounting specs. Do they require shaft/housing hardening? Yes — shaft hardness ≥58 HRC recommended. What’s the max speed? Up to 6,000 rpm (grease-lubed, light load). Can they handle axial loads? No — strictly radial only. Is cage material standard? Yes — high-strength polyamide (PA66) or brass upon request.
Product Summary
- Product Name
- NAK Needle Roller Bearings Rnav4903-4907, High Load Capacity
- 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
NAK Needle Roller Bearings Rnav4903-4907, High Load Capacity
NDA protected · Free samples for orders > $50K · Reply within 12 hours
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