No Sealed Aligning Needle Roller Bearing RPNA28 / 44 28 x 44 x 20mm

1. Product Overview

1.Product Overview
RPNA28/44 is RPNA series radial split adjustable eccentric needle roller bearing equipped with matched quenched integral inner ring, unified standard dimension inner bore d=28mm, outer diameter D=44mm, overall width B=18mm. It adopts split outer ring self-aligning structure, supporting micro center distance fine adjustment to eliminate machining and assembly deviation between shaft and housing holes.

This complete pre-assembled unit consists of high-precision cylindrical needle rollers, stamped steel cage and solid heat-treated inner ring. The split outer ring reserves compression clearance, users can lock the adjusted eccentric position firmly after bolt tightening positioning. All bearing rings and needle rollers adopt full quenched GCr15 bearing steel with ultra-precision grinding treatment. Needle rollers pass strict dimensional sorting to keep consistent tolerance, realizing stable low-noise rotation under medium-heavy alternating radial load. Widely matched for printing machine heavy tension rollers, automatic packaging film unwinding shafts, medium-weight material conveyor support rollers and textile large rotary positioning transmission assemblies.

2. Technical Specifications

3. Core Advantages

1. Split adjustable outer ring self-aligning design, effectively compensate machining and assembly errors of shaft and housing, reduce equipment assembly reject rate.
2. 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.
3. Compact thin-wall radial layout, occupies limited radial installation space, ideal matching component for narrow roller support structures of medium-sized printing and packaging machinery.
4. 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.
5. Split outer ring with compression gap, the eccentric positioning can be firmly locked after bolt tightening without displacement during long-term equipment running.
6. Full customizable service support: C3 enlarged radial clearance, P6 high precision grade, OEM laser marking on outer ring, neutral export carton anti-rust packaging.
7. Integral pre-assembled bearing unit, steel cage stably fixes needle rollers to avoid roller scattering during disassembly and after-sales maintenance.
8. Passivation anti-corrosion treatment on outer ring surface, excellent rust resistance for indoor light dust industrial working environments.

4. Application Scenarios

RPNA28/44 split adjustable eccentric 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 28mm bore RPNA 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 RPNA series split adjustable eccentric needle roller bearings including RPNA28/44
• RPNA28/44 fully dimensionally interchangeable with international standard RPNA series eccentric 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 ring 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 split adjustable self-aligning 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 ring
• Precision stamping, cutting, quenching tempering and finish grinding processing for split 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: RPNA28/44 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 RPNA28/44 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 RPNA28/44 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 RPNA 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 RPNA28/44 bearing?
   A1: It adopts split outer ring adjustable eccentric structure with complete integrated inner ring, which can fine-tune installation center distance to compensate static assembly misalignment of shaft and housing.
2. Q2: Do I need to purchase an extra inner ring for RPNA28/44?
   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 RPNA28/44 widely applicable to?
   A3: Mainly matched with heavy tension rollers of printing machines, unwinding rollers of packaging equipment, main support rollers of medium light conveyors and auxiliary transmission shafts of textile machinery.