Sheet Steel Cage Aligning Needle Roller Bearing PNA25/47 25x47x20mm

1. Product Overview

PNA25/47 is metric PNA series self-aligning split adjustable eccentric needle roller bearing equipped with integrated quenched inner ring, unified standard dimension inner bore d=25mm, outer diameter D=47mm, overall width B=20mm. It adopts spherical outer ring matched split outer sleeve dual structure, supporting tiny center distance fine adjustment and static self-aligning compensation to eliminate assembly deviation between shaft and housing holes.

The pre-assembled full set includes high-precision cylindrical needle rollers, stamped steel cage and solid heat-treated inner ring. The split outer sleeve reserves compression clearance, users can lock the adjusted eccentric position by tightening bolts after positioning. All bearing rings and needle rollers adopt full quenched GCr15 bearing steel processed by ultra-precision grinding. Needle rollers go through strict dimensional sorting to guarantee consistent tolerance, realizing stable low-noise rotation under medium alternating radial load. Widely applied to printing machine heavy tension rollers, automatic packaging film unwinding shafts, medium-weight light conveyor support rollers and textile large auxiliary rotary positioning assemblies.

2. Technical Specifications

Model: PNA25/47
Basic dimension: d=25mm, D=47mm, B=20mm
Inner ring raceway diameter F=30mm, housing shoulder limit D1=40mm
Structure: Self-aligning split adjustable needle roller bearing, complete inner ring, stamped steel retainer
Raw material: GCr15 high carbon chromium bearing steel for rings and needle rollers
Standard radial clearance: CN normal clearance, C3 enlarged clearance customizable
Adjustment parameter: ±0.35mm center distance fine-tuning range, maximum allowable axial offset 0.6mm
Minimum shaft fillet radius r=1.0mm, inner ring fillet r1=0.4mm
Operating temperature range: -30℃ ~ 120℃
Single piece net weight: 0.125kg
Basic dynamic radial load Cr: 21.5kN
Basic static radial load C0r: 30.2kN
Grease limiting rotation speed: 4500 r/min
Complete installation drawings, eccentric adjustment operation guide and long-cycle continuous rotation durability test reports can be provided upon customer request.

3. Core Advantages

• Spherical self-aligning outer ring plus split adjustable outer sleeve dual design, effectively offset shaft and housing machining & assembly errors, reduce equipment assembly rejection rate.
• Standard equipped integrated heat-treated inner ring, no extra hardening and grinding processing required for matching shaft, simplify accessory processing and shorten production assembly cycle.
• Compact thin-wall radial layout, occupies small radial installation space, ideal matching component for narrow roller support structures of medium-sized printing and packaging machinery.
• Mirror superfinished needle rollers with strict diameter sorting, uniform stress distribution of each roller, low operating noise and slight temperature rise during long medium-speed continuous operation.
• Split outer sleeve with compression gap, the eccentric positioning can be firmly locked after bolt tightening without displacement during long-term equipment running.
• Full customizable service support: C3 enlarged radial clearance, P6 high precision grade, OEM laser marking on outer sleeve, neutral export carton anti-rust packaging.
• Integral pre-assembled bearing unit, steel cage stably fixes needle rollers to avoid roller scattering during disassembly and after-sales maintenance.
• Passivation anti-corrosion treatment on outer sleeve surface, excellent rust resistance for indoor light dust industrial working environments.

4. Application Scenarios

PNA25/47 self-aligning split adjustable needle roller bearing is core adjustable supporting spare part for medium light industrial transmission equipment:

• Printing machinery paper feeding roller, heavy tension roller rotary support bearing assemblies
• Automatic packaging equipment film unwinding roller transmission positioning units
• Medium-weight material conveying equipment main roller support bearing positions
• Large textile spinning auxiliary transmission shafts, medium garden power equipment rotary joints

Aftermarket interchangeable 25mm bore PNA series self-aligning eccentric needle roller bearing
Cost-effective misalignment compensation needle bearing solution for printing machine OEM, packaging equipment factories and medium light conveyor machinery bulk matching.

5. Why Choose GQZ Bearing

• 25 years professional manufacturing experience for PNA series self-aligning split adjustable needle roller bearings including PNA25/47
• PNA25/47 fully dimensionally interchangeable with international standard PNA series self-aligning needle bearings, consistent adjustment range, load rating and assembly tolerance indicators.
• Complete OEM & ODM customization service supporting C3 clearance upgrade, high precision grade and special surface anti-rust treatment.
• Full strict pre-delivery inspection: GCr15 ring hardness test, needle roller dimensional sorting inspection, split sleeve repeated adjustment fatigue test, high-speed continuous rotation aging test.
• Professional needle bearing engineering team provides eccentric fine-tuning and shaft housing matching installation technical guidance within 24 hours.
• Stable mass production lines with favorable bulk wholesale prices for long-term printing equipment manufacturers, packaging machinery suppliers and medium light conveyor equipment factories.
• We focus on spherical self-aligning split adjustable design, integrated inner ring all-in-one structure, compact space-saving layout and long-term win-win cooperation with global light industrial transmission spare parts buyers.

6. Quality Control

• Raw material chemical composition and hardness inspection of GCr15 bearing steel inner ring and split outer sleeve
• Precision stamping, cutting, quenching tempering and finish grinding processing for spherical outer ring and solid inner ring
• Needle roller precision cutting, hardening and mirror superfinishing, automatic dimensional sorting screening process
• Stamped steel cage integrated forming and automatic roller assembly procedure to evenly control roller clearance
• Classified targeted performance testing: PNA25/47 long-cycle medium-speed rotation aging test, repeated eccentric adjustment fatigue test, radial combined load deformation detection
• Full dimensional and surface defect recheck before anti-rust oil coating and carton packaging shipment
• Each batch of PNA25/47 bearings passes full sampling radial load reciprocating rotation test to guarantee stable long-term self-aligning support performance inside printing, packaging and medium light conveyor transmission equipment.

7. Get A Quote Now

If you need self-aligning split adjustable PNA25/47 needle roller bearings with integral inner ring for printing, packaging and medium light conveyor machinery maintenance & OEM matching, send your inquiry directly.
You will receive complete professional supporting services after submitting your inquiry:
Fast official factory quotation reply within 24 hours
One-on-one eccentric adjustment operation & shaft housing matching installation technical guidance from professional PNA series needle bearing engineers
Customized bearing scheme suggestions including C3 enlarged clearance upgrade options
Competitive direct factory bulk wholesale price for large spare parts bulk orders
Send your required purchase quantity and equipment medium-speed light dust working environment to obtain detailed formal quotation.

8. FAQ

1. Q1: What is the core structural feature of PNA25/47 bearing?
   A1: It adopts spherical outer ring self-aligning + split outer sleeve adjustable eccentric structure with complete integrated inner ring, which can compensate static assembly misalignment of shaft and housing and fine-tune installation center distance.
2. Q2: Do I need to purchase an extra inner ring for PNA25/47?
   A2: No, the bearing is equipped with matched quenched integral inner ring, which can be directly installed on standard ground shaft without additional heat treatment processing.
3. Q3: What equipment is PNA25/47 widely applicable to?
   A3: Mainly matched with heavy tension rollers of printing machines, unwinding rollers of packaging equipment, main support rollers of light conveyors and auxiliary transmission shafts of textile machinery.