30x52x20mm Aligning Needle Roller Bearing With Removable Inner Ring , PNA30/52

1. Product Overview

PNA30/52 is metric PNA series self-aligning split adjustable eccentric needle roller bearing with matched quenched integral inner ring, unified standard dimension inner bore d=30mm, outer diameter D=52mm, overall width B=22mm. It combines spherical outer ring and split outer sleeve dual structure, supports micro center distance fine adjustment and static self-aligning compensation to eliminate assembly deviation between shaft and housing holes.

This complete pre-assembled unit includes high-precision cylindrical needle rollers, stamped steel cage and solid heat-treated inner ring. The split outer sleeve reserves compression clearance, and users can lock the adjusted eccentric position by tightening bolts after positioning. All bearing rings and needle rollers adopt full quenched GCr15 bearing steel with ultra-precision grinding treatment. Needle rollers are strictly sorted for uniform dimensional tolerance, delivering stable low-noise rotation under medium-heavy alternating radial load. Widely matched for printing machine heavy tension rollers, automatic packaging large film unwinding shafts, heavy-duty light conveyor support rollers and textile large rotary positioning transmission assemblies.

2. Technical Specifications

3. Core Advantages

• Spherical self-aligning outer ring plus split adjustable outer sleeve dual design, effectively compensate machining and assembly errors of shaft and housing, reduce equipment assembly reject 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 limited radial installation space, ideal matching component for narrow roller support structures of medium & heavy 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

PNA30/52 self-aligning split adjustable needle roller bearing is core adjustable supporting spare part for medium-heavy light industrial transmission equipment:

• Printing machinery paper feeding roller, heavy tension roller rotary support bearing assemblies
• Automatic packaging equipment large film unwinding roller transmission positioning units
• Heavy-weight material conveying equipment main roller support bearing positions
• Large textile spinning auxiliary transmission shafts, medium garden power equipment rotary joints
• Aftermarket interchangeable 30mm bore PNA series self-aligning eccentric needle roller bearing
• Cost-effective misalignment compensation needle bearing solution for printing machine OEM, packaging equipment factories and heavy 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 PNA30/52
• PNA30/52 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 heavy 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: PNA30/52 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 PNA30/52 bearings passes full sampling radial load reciprocating rotation test to guarantee stable long-term self-aligning support performance inside printing, packaging and heavy light conveyor transmission equipment.

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8. FAQ