GQZ 31308A-DF-A50-90 Pre-Matched DF Face-To-Face Tapered Roller Bearing Set 40×90×50.5mm
31308A-DF-A50-90 is factory pre-matched double 31308A single row tapered roller bearings arranged in DF face-to-face (X-type) configuration.
- A = reinforced high contact angle design for greater axial load capacity
- DF = Face-to-face matched assembly
- A50-90 = standardized spacer / mounting dimension designation for original equipment interchange
This matched set simultaneously bears heavy radial load and bidirectional axial thrust, improves system rigidity and resists shaft deflection. Open design supports convenient re-lubriion maintenance. Widely fitted on heavy-duty gearboxes, vehicle drive axles, construction machinery reducers and medium-high speed rotary transmission assemblies.
Formal quotation will be sent within 24 hours upon your inquiry.
- Model
- 31308A-DF-A50-90
- Single unit reference
- 31308A
- Overall dimensions
- d40 mm, D90 mm, total width 2T=50.5 mm
- Single 31308A size
- 40×90×25.25 mm
- Net weight
- approx 1.52 kg
- Structure
- Two matched single row tapered roller bearings, DF face-to-face arrangement
- Material
- GCr15 bearing chrome steel, pressed steel cage
- Contact angle
- Large angle 313 series, excellent axial load performance
- Additional info
- Complete dimension drawings and load data available on request.
- Factory pre-matched DF set, guaranteed mounting preload consistency, no on-site manual matching required
- Face-to-face layout provides higher rigidity, effectively reduces shaft bending deflection
- Large contact angle 31308A structure withstands heavy bidirectional axial and combined radial loads
- Standard OE dimension A50-90, direct interchange for original equipment
- Separable cone and cup structure facilitates assembly, inspection and replacement
- Customizable: OEM laser marking, heavy-duty extreme pressure grease, P6/P5 precision grade
- Heavy-duty industrial gearboxes and vehicle differential drive assemblies
- Construction machinery, agricultural equipment main transmission shafts
- Screw compressors, large fan drive units
- Mining machinery reducers and medium-high speed rotary equipment
- Transmission positions subject to alternating bidirectional axial forces
- 25 years professional bearing manufacturer, products exported globally.
- Strict raw material inspection and precision grinding process.
- Professional matched bearing pairing control.
- 24-hour technical support for DF/DB/DT arrangement consultation.
- Ample stock for machinery distributors.
- Precise dimensions and stable service performance.
- GCr15 raw material quenching & tempering treatment
- Precision superfinishing for raceways and tapered rollers
- Strict matched group clearance & preload testing
- Dimension tolerance and rotational noise inspection
If you need 31308A-DF-A50-90 tapered roller bearing sets:
Send inquiry to obtain below supports:
- Quick quotation within 24 hours
- Alternative DB back-to-back matched version consultation
- Competitive factory direct price
Contact our sales team for full datasheets and formal offer.
- Q1: Suffix explanation
- 31308A = reinforced single tapered roller bearing;
- DF = Face-to-face (X arrangement) paired;
- A50-90 = OEM standard matched set marking for interchange.
- Q2: Main overall dimensions of 31308A-DF-A50-90?
- 40×90×50.5 mm matched bearing assembly.
- Q3: DF vs DB difference?
- DF face-to-face: wider load support span, sensitive to housing misalignment;
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