12x28x12mm Aligning Needle Roller Bearing PNA12 / 28 Insert Type Bearing

1. Product Overview

PNA12/28 is metric PNA series split adjustable eccentric needle roller bearing with integral inner ring, unified standard dimension inner bore d=12mm, outer diameter D=28mm, overall width B=16mm. Unique split outer ring structure allows slight eccentric position adjustment during installation, effectively compensate assembly offset between shaft and housing holes.

Integrated assembly includes precision cylindrical needle rollers, stamped steel cage and quenched inner ring, split outer ring with tightening clearance gap, realize fine-tuning of center distance after bearing installation. All rolling elements, inner ring and outer ring adopt through-hardened GCr15 bearing steel, precision grinding treatment, uniform roller dimensional tolerance, stable rotation under medium radial alternating load. Widely matched for printing equipment roller support, packaging machinery transmission shafts, light conveyor roller assemblies and textile auxiliary rotary positioning units.

2. Technical Specifications

Model: PNA12/28
Basic dimension: d=12mm, D=28mm, B=16mm
Structure: Split adjustable eccentric needle roller bearing, complete with inner ring, stamped steel cage
Raw material: GCr15 high carbon chromium bearing steel for ring and needle rollers
Standard clearance: CN normal radial clearance, C3 enlarged clearance customizable
Adjustable eccentric range: ±0.3mm center distance fine adjustment
Minimum shaft fillet radius r=0.8mm
Operating temperature range: -30℃ ~ 120℃
Net weight: 0.024kg
Basic dynamic radial load Cr: 11.8kN
Basic static radial load C0r: 13.5kN
Grease limiting rotation speed: 5800 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

1. Split outer ring exclusive eccentric adjustable structure, solve installation misalignment problem caused by machining tolerance of housing holes and shaft seats, reduce equipment assembly rejection rate.
2. Complete set with machined inner ring, no extra hardened shaft required for installation, simplify supporting part processing and shorten production assembly cycle.
3. Compact radial thin-wall layout, occupy small installation space, ideal matching solution for narrow roller support structure of printing and packaging machinery.
4. Strictly sorted mirror polished needle rollers, uniform load distribution, low running noise and small temperature rise under long-time medium-speed continuous operation.
5. Split outer ring with reserved tightening gap, can lock the adjusted eccentric position by bolt compression, no position shift during long-term equipment operation.
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. Pre-assembled integral bearing unit, needle rollers fixed by stamped steel cage, avoid roller scattering during disassembly and maintenance.
8. Passivation anti-rust surface treatment for outer ring, stable anti-corrosion performance for indoor light dust industrial working environment.

4. Application Scenarios

PNA12/28 adjustable split eccentric needle roller bearing is core adjustable support spare part for light industrial transmission equipment:

• Printing machinery paper feeding roller, tension roller rotary support bearing assemblies
• Automatic packaging equipment film unwinding roller transmission positioning units
• Light weight material conveying equipment small roller support bearing positions
• Textile spinning auxiliary transmission shafts, small garden power machinery rotary joints

Aftermarket interchangeable 12mm bore PNA series split eccentric needle roller bearing
Cost-effective adjustable center distance needle bearing solution for printing machine OEM, packaging equipment factories and light conveyor machinery bulk matching.

5. Why Choose GQZ Bearing

1. 25 years professional manufacturing experience for PNA series split adjustable eccentric needle roller bearings including PNA12/28
2. PNA12/28 fully dimensionally interchangeable with international standard PNA series eccentric needle bearings, consistent adjustable range, load rating and assembly tolerance indicators.
3. Complete OEM & ODM customization service supporting C3 clearance upgrade, high precision grade and special surface anti-rust treatment.
4. Full strict pre-delivery inspection: GCr15 ring hardness test, needle roller dimensional sorting inspection, split outer ring adjustment deformation test, high-speed continuous rotation aging test.
5. Professional needle bearing engineering team provides eccentric fine-tuning and shaft housing matching installation technical guidance within 24 hours.
6. Stable mass production lines with favorable bulk wholesale prices for long-term printing equipment manufacturers, packaging machinery suppliers and light conveyor equipment factories.

We focus on split adjustable eccentric design, complete inner ring integrated structure, compact space-saving layout and long-term win-win cooperation with global light industrial transmission spare parts buyers.

6. Quality Control

1. Raw material chemical composition and hardness inspection of GCr15 bearing steel inner and outer rings
2. Precision stamping, cutting, quenching tempering and finish grinding processing for split outer ring and solid inner ring
3. Needle roller precision cutting, hardening and mirror superfinishing, automatic dimensional sorting screening process
4. Stamped steel cage integrated forming and roller assembly procedure, control roller clearance evenly
5. Classified targeted performance testing: PNA12/28 long-cycle medium-speed rotation aging test, repeated eccentric adjustment fatigue test, radial load deformation detection
6. Full dimensional and surface defect recheck before anti-rust oil coating and carton packaging shipment

Each batch of PNA12/28 bearings passes full sampling radial load reciprocating rotation test to guarantee stable long-term adjustable support performance inside printing, packaging and light conveyor transmission equipment.

7. Get A Quote Now

If you need adjustable split eccentric PNA12/28 needle roller bearings with inner ring for printing, packaging and 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