AC COMPRESSOR BALL BEARING BD355220 DK

Overview of BD355220 DK AC Compressor Ball Bearing

The BD355220 DK is a sealed, deep-groove ball bearing tailor-made for automotive air-conditioning compressor shafts. Its construction focuses on high load capacity, effective sealing against refrigerant and lubricant, and long-term quiet operation under varying thermal cycles.

Key Specifications

• Bore Diameter (d): 35 mm

• Outer Diameter (D): 55 mm

• Width (B): 20 mm

• Dynamic Radial Load Rating (C): ≈13 600 N

• Static Radial Load Rating (C₀): ≈7 600 N

• Maximum Limiting Speed: 20 000 RPM

• Mass: ~0.12 kg

Design & Materials

• Ring & Balls: High-carbon chromium bearing steel (e.g. SAE 52100) for superior fatigue life.

• Cage (D): Pressed-steel cage for stable ball guidance under oscillating motion.

• Seals (K): Double-lip synthetic-rubber seals on both sides providing excellent retention of compressor oil and exclusion of dusty or humid contaminants.

• Grease Fill: High-temperature polyurea grease compatible with PAG or POE refrigerant oils, factory-packed for immediate use.

• Internal Clearance: Standard (C0) to balance friction, heat generation, and dimensional stability in compressor environments.

Functional Features

1. High Radial Load Capacity
   – Supports the combined forces from belt tension, piston thrust, and dynamic imbalance.

2. Effective Sealing
   – Dual rubber lips resist ingress of moisture or debris and retain grease under fluctuating pressures and temperatures.

3. Thermal Stability
   – Steel and grease selections withstand intermittent operation up to 150 °C without significant loss of preload or increase in noise.

4. Low Noise & Vibration
   – Precision grinding of raceways and balanced cage design minimize bearing run-out and audible whine.

Typical Applications

• Automotive A/C compressor shafts (reciprocating or rotary scroll types)

• Refrigeration system compressors in light trucks

• Auxiliary climate-control units for hybrid or electric vehicles

Equivalent & Interchange Numbers

• SKF: 6307‐2RSL (35×62×14* variant adapted to 35×55×20 housing kits)

• NSK: 6307 DDU (modified series)

• NTN: 6307 LLU (with bespoke spacer rings)

* Note: Equivalent part dimensions may require adapter rings or custom housings to achieve exact 35×55×20 mounting.

• Contact the sales department for more information.