NA6903 Needle Roller Bearing With Inner Ring 17×30×13 Precision Compact Needle Bearing For Automation Equipment

1. Product Overview

NA6903 is double row needle roller bearing equipped with separable machined solid inner ring, unified metric dimension d17×D30×B13mm. It belongs to NA series precision needle roller bearing, compact thin-wall outer ring design greatly saves radial installation space of equipment. Double dense cylindrical needle roller layout achieves ultra-high radial bearing capacity under limited space, can only bear radial load without axial load bearing capacity. Separable inner ring and outer needle shell structure facilitates independent installation of shaft and housing, convenient disassembly during equipment maintenance. All outer ring, needle rollers and inner ring adopt fully quenched GCr15 bearing steel, ultra-precision superfinished rolling surface, uniform line contact stress distribution, stable wear resistance under long-time continuous reciprocating operation. Widely applied to miniature gear pumps, textile spinning equipment, electronic automation sliding parts, small transmission gearboxes and light-duty hydraulic power components.

2. Technical Specifications

Complete miniature gear pump installation drawings, light radial load matching guide and long-cycle reciprocating wear durability test reports can be provided upon customer request.

3. Core Advantages

• Double row dense needle roller layout, far higher radial load capacity than single row needle bearings of the same outline size, suitable for small space heavy radial load working conditions.
• Separable solid inner ring design, inner ring can be pre-installed on transmission shaft, outer needle shell pressed into equipment housing separately, simplify assembly process.
• Ultra-thin wall outer ring compact structure, occupy minimum radial space, perfect for miniature hydraulic pumps and small automation equipment with limited internal layout.
• Precision stamped steel retainer evenly isolates each group of needle rollers, avoid roller skew and scattering under frequent forward and reverse alternating rotation.
• Integral quenching heat treatment reaches HRC60–65 high hardness, outstanding anti-fatigue and anti-indentation performance, extend spare parts replacement cycle of precision automation equipment.
• Mirror superfinished needle and raceway contact surface, low friction coefficient, low vibration and low noise during long-time continuous high-speed operation.
• Standard unified metric installation dimension, fully interchangeable with global NA6903 series needle roller bearings, no modification to shaft and housing during aftermarket replacement.
• Comprehensive customized service: P6 high precision upgrade, C3 clearance adjustment, OEM laser marking on outer ring surface, neutral export carton anti-rust packaging, high-temperature anti-wear lithium grease pre-filling.

4. Application Scenarios

NA6903 compact double row needle roller bearing with inner ring is core miniature heavy radial load rotating spare part for hydraulic and light automation equipment:

• Small hydraulic gear pump, micro oil pump internal rolling support bearing assemblies
• Textile spinning loom, yarn winding machine light load transmission matching units
• Electronic product automatic assembly equipment, miniature sliding linear moving positions
• Small speed reduction gearbox, precision instrument low-speed heavy radial rotating components
• Medical miniature power equipment, laboratory small hydraulic actuator support bearings

Aftermarket interchangeable NA69 series separable inner ring needle roller bearing Cost-effective space-saving high radial load bearing solution for hydraulic pump manufacturers, textile automation OEM and precision miniature machinery maintenance factories bulk procurement.

5. Why Choose GQZ Bearing

• 25 years professional manufacturing experience of NA series double row needle roller bearings with inner ring including NA6903
• NA6903 fully dimensionally interchangeable with international standard compact needle roller bearings, consistent radial load rating, reciprocating fatigue resistance and separable assembly tolerance standards.
• Complete OEM & ODM customization service supporting P6 precision grade and high temperature resistant grease filling.
• Strict full pre-delivery inspection flow: GCr15 raw material metallographic & hardness test, needle roller dimensional sorting screening, long-cycle high-speed radial load aging test, continuous reciprocating friction wear simulation test.
• Professional needle roller bearing engineering team provides one-on-one radial load calculation, shaft tolerance matching and separable inner ring press-fit installation technical guidance within 24 working hours.
• Stable mass production workshop with competitive factory direct bulk wholesale price for large-volume single model orders, long-term stable supply for global hydraulic pump, textile and miniature automation equipment spare parts buyers.

We specialize in double row dense needle roller compact structure, separable solid inner ring design, universal metric interchangeable mounting dimension standard and long-term win-win cooperation with miniature hydraulic transmission equipment suppliers.

6. Quality Control

• Raw material chemical composition, internal flaw and hardness inspection for GCr15 bearing steel outer ring, inner ring and needle roller blanks
• Outer ring precision stamping, quenching & tempering, multi-step ultra-precision raceway grinding process
• Cylindrical needle roller high-temperature quenching, mirror polishing and high-precision automatic dimensional sorting production line
• Steel retainer stamping forming, automatic double row needle assembly process, strictly control needle running clearance and circumferential uniform distribution
• Targeted classified performance testing: NA6903 long-cycle continuous radial load rotation aging test, repeated forward-reverse reciprocating friction fatigue test, high-temperature grease long-cycle wear detection
• Full dimensional tolerance, surface burr and raceway roughness recheck before anti-rust oil coating and export carton moisture-proof packaging shipment

Every production batch of NA6903 bearings undergoes full sampling miniature gear pump simulation rotation test to guarantee stable long-term compact heavy radial load support performance in micro hydraulic and automation equipment.

7. Get A Quote Now

If you need NA6903 separable inner ring double row compact needle roller bearings for miniature hydraulic pump manufacturing, textile automation equipment assembly and precision small machinery maintenance bulk matching, send your purchase inquiry directly.

You will receive full professional supporting services after submitting inquiry:

• Fast official factory sealed formal quotation reply within 24 working hours
• One-on-one radial dynamic/static load calculation, transmission shaft tolerance matching and separable inner ring installation technical guidance from professional needle roller bearing engineers
• Customized bearing performance solutions including P6 high precision upgrade and C3 enlarged clearance options
• Competitive direct factory bulk wholesale price for large-volume NA6903 single model orders

Provide your required purchase quantity, equipment rotation speed and limited radial space working environment to obtain detailed formal quotation document.

8. FAQ