QJ 308 MA

Four-point contact ball bearings

Four-point contact ball bearings can withstand higher axial loads and smaller radial loads in both directions. They can be operated at very high speeds and can withstand higher axial forces than deep groove ball bearings. The outer ring assembly with steel balls and cage can be mounted separately from the double half inner ring.

  • High speed capability
  • Can withstand higher bi-directional axial loads and smaller radial loads
  • Requires much less axial space than double row angular contact ball bearings

+86 13817962999

Overview
Technical Parameters

Overview

Skim Through

Size

Inner Diameter40.0mm
Outer Diameter90.0mm
Width23.0mm
Contact angle35.0°

Performance

Basic dynamic load rating78.0kN
Basic rated static load64.0kN
Limiting speed14000.0r/min
SKF Performance Rating SKF Explorer

Properties

Contact type Four-point contact
Number of columns 1
Locating feature, bearing outer ring None
Ring type Two-piece inner ring and integral outer ring
Cage Machined metal
Mating Configuration None
Universal Matching Bearing None
Axial clearance CN
Material, bearing Bearing steel
Coated without
Sealing Without
Lubricant without
Relubrication function without

Logistics

Net weight0.771kg
eClass Code 23-05-08-05
UNSPSC Code 31171538

Technical Parameters

Technical Parameters

Size

d40.0mm Hole diameter
D90.0mm Outer diameter
B23.0mm Width
d1 ≈52.0mm Diameter of inner ring retaining edge
D1 ≈72.5mm Outer ring flange diameter/seat inner diameter
a46.0mm Distance to load point
r1,2 min.1.5mm Inner ring chamfer size

Shoulder size

da min.49.0mm Shaft shoulder diameter
Da max.81.0mm Bearing housing shoulder size
ra max.1.5mm Chamfering radius

Data Calculation

SKF Performance Levels SKF Explorer
Basic dynamic load rating C78.0kN
Basic Static Load RatingC064.0kN
Fatigue Load LimitPu2.7kN
Limit speed14000.0r/min
Calculation coefficient A0.0118
Limit value e0.95
Calculation coefficient X0.6
Calculation factorY00.58
Calculation factorY10.66
Calculation factorY21.07

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