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Needle Bearing
Needle Roller Bearings HK4520 HK5025 45X55X38 High Quality
Ensure smooth, high-performance rotation in your machinery with these premium Needle Roller Bearings, designed to minimize friction and extend equipment lifespan even under heavy loads. The HK4520 and HK5025 models (45X55X38mm) deliver reliable precision, making them ideal for applications where space is limited but durability can’t be compromised.
- Engineered with a thin-walled outer ring to maximize radial load capacity without sacrificing installation space
- High-quality construction ensures consistent operation, reducing unexpected downtime and maintenance costs
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
Product Specifications
| Parameter | Details |
|---|---|
| Bearing Type | Needle Roller Bearings |
| Model Number | HK4520, HK5025 |
| Bore Diameter (d) | 45 mm, 50 mm |
| Outside Diameter (D) | 55 mm |
| Width (B) | 38 mm |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Automation Equipment | Linear actuators, precision slides |
| Hydraulic Systems | Cylinder piston rods, hydraulic cylinders |
| Mechanical Engineering | Transmission components, gearboxes |
Needle Roller Bearings HK4520 & HK5025: Solving Your Sizing and Reliability Challenges
Finding the right needle roller bearings for your equipment can be frustrating—either the dimensions don’t match, leading to installation delays, or the quality is subpar, causing premature wear and unexpected downtime. Sourcing from multiple suppliers just to compare options only adds to the inefficiency.
Engineered for Precise Fit and Long Service Life
Our HK4520 (45x55x38 mm) and HK5025 (50x55x38 mm) needle roller bearings address these issues directly. Manufactured under ISO 9001-certified processes, they meet strict dimensional accuracy standards to ensure drop-in compatibility with existing equipment. With our extensive inventory, we maintain ready stock for quick delivery, eliminating the need to wait for production lead times.
Optimal Performance in Compact Spaces Under Load
These needle roller bearings excel in applications where radial space is limited but high load capacity is required. Their design—featuring a thin-walled outer ring and full complement of needle rollers—delivers exceptional radial load handling while keeping overall dimensions compact. Ideal for use in hydraulic cylinder rods, linear actuators, and transmission components where space constraints and load efficiency are critical factors.
Critical Engineering Features for Reliable Operation
The precision of these bearings starts with tight dimensional tolerances. The 45 mm and 50 mm bore diameters, combined with 55 mm outer diameter and 38 mm width, ensure consistent fit across installations. The needle roller design maximizes contact area with the raceways, distributing load evenly to prevent stress concentrations. Surface hardness testing during production verifies resistance to wear, while the cage structure maintains proper roller spacing for smooth rotation at moderate speeds.
Why Choosing the Right Needle Roller Bearing Lowers Total Costs
Investing in quality needle roller bearings reduces long-term expenses by minimizing downtime and replacement frequency. Inferior bearings often fail early due to material inconsistencies or poor precision, leading to costly equipment repairs and production interruptions. Our bearings, tested for dimensional accuracy and hardness, provide predictable performance, aligning with ISO 281 guidelines for bearing life calculation. This reliability translates to lower total cost of ownership compared to cheaper alternatives.
Quality Backed by Rigorous Testing and Standards
Every batch of our needle roller bearings undergoes comprehensive quality checks. Raw materials are inspected for chemical composition and mechanical properties before production. Finished bearings are measured for dimensional accuracy, surface finish, and hardness to ensure compliance with international standards. We stand behind our products with a warranty covering manufacturing defects, and our team can assist with documentation to support your quality control processes.
Packaging & Shipping
- Neutral packaging with protective wrapping to prevent damage during transit
- Ready stock available for same-day or next-day dispatch
- Flexible shipping options including express courier, air freight, and sea freight
- Low minimum order quantity to support small-scale repairs and large production runs
Get a Quote for HK4520 and HK5025 Needle Roller Bearings
Whether you need the HK4520, HK5025, or other needle roller bearing models, we can provide competitive pricing and availability. Simply share the specific model, quantity, and delivery location, and our team will prepare a detailed quote. With our broad network of suppliers, we can also source alternative brands if required—let us know your preferences.
Frequently Asked Questions
Q: Do you supply needle roller bearings from other brands?
A: Yes, we support inquiries for all major international and domestic brands. We can source bearings according to your specified brand or model requirements.
Q: How can I confirm if the HK4520/HK5025 fits my equipment?
A: Provide your equipment’s bearing dimensions (bore, outer diameter, width) or original part number, and our technical team will verify compatibility with the HK series specifications.
Q: What is your warranty policy for these needle roller bearings?
A: We offer a warranty against manufacturing defects. The specific warranty period and terms will be detailed in your order confirmation.
Q: What is the minimum order quantity for HK4520 and HK5025?
A: We accept low minimum order quantities, including single-unit purchases for emergency repairs, with volume discounts available for larger orders.
Q: How quickly can you ship the HK4520 and HK5025 bearings?
A: These models are in stock and typically ship within 1-2 business days. Shipping time depends on your location and chosen delivery method.
Q: Can you provide custom needle roller bearings with different dimensions?
A: Yes, we support OEM/ODM customization for needle roller bearings. Contact us with your drawings or specific requirements for a feasibility assessment.
Ready to order or need a quote?
Send the bearing model, dimensions (d x D x B), and quantity — we’ll get back to you with pricing and lead time.
Contact us via email or phone for immediate assistance.
Product Summary
- Product Name
- Needle Roller Bearings HK4520 HK5025 45X55X38 High Quality
- 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.
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Steel & Metallurgy
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Automotive / EV
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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 Roller Bearings HK4520 HK5025 45X55X38 High Quality
NDA protected · Free samples for orders > $50K · Reply within 12 hours
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