Double Row Angular Contact Double Ball Bearings 3200 3201 3202 3203 3205 3205A 3206 3207 3208 3209 3211 3212 3213 3302 3304 3306 3307 3308 3309 3310 3311 3312

UJK Double Row Angular Contact Ball Bearings: High-Precision Solutions for Combined Loads

UJK double row angular contact ball bearings deliver exceptional rigidity, rotational accuracy, and bidirectional axial/radial load capacity in a compact design. Ideal for applications demanding high-speed performance and resistance to complex force interactions (e.g., machine tools, automotive systems), these bearings minimize axial space while maximizing stability. Below is a technical breakdown of key series:

Series & Dimensional Ranges

1. 3200 & 3300 Series: Standard Duty

• Design: Optimized for moderate radial loads with bidirectional axial support. Contact angle: 30°-40°38.

• Applications: Gearboxes, pump shafts, industrial fans.

• Dimensions:

  Series	d (mm)	D (mm)	B (mm)
  3200	10-50	30-90	14-30
  3300	12-60	35-110	18-44.4	89
  Example: 3310A/C3: 50×110×44.4 mm8.

2. 5200 & 5300 Series: Heavy-Duty & High-Speed

• Design: Enhanced load capacity with C3 internal clearance for thermal stability. Supports speeds up to 7,100 rpm (oil-lubricated)29.

• Applications: Machine tool spindles, electric vehicle drivetrains.

• Dimensions:

  Series	d (mm)	D (mm)	B (mm)
  5200	20-80	40-150	18-40
  5300	25-110	47-170	20-44	49
  Example: 5208: 40×80×30.2 mm2.

3. 3800 Series: Compact Stainless Steel

• Design: Corrosion-resistant (440C stainless steel), ideal for harsh environments. ABEC-5 precision with Z2 vibration class45.

• Applications: Food processing, marine equipment, medical devices.

• Dimensions:

  d (mm)	D (mm)	B (mm)
  4.7-38	12-80	7-26	4

Technical Highlights

• Precision & Durability:

  • ABEC-3/5 precision grades4.

  • Optional hybrid ceramic balls (SiN) for 3-5× longer lifespan and 60% weight reduction1.

• Configuration Flexibility:

  • Open, shielded (ZZ), or rubber-sealed (2RS) variants15.

  • C3 clearance standard for thermal expansion management8.

• Performance Metrics:

  • Limiting speeds: 5,600 rpm (grease), 7,100 rpm (oil)2.

  • Axial load ≤50% of radial load capacity3.

Applications

• Industrial Machinery: Machine tool spindles (5200/5300 series)39.

• Automotive: EV motor shafts, steering systems (3300 series)310.

• Robotics & Medical: Articulated arms, imaging devices (3800 stainless series)14.