AC COMPRESSOR BALL BEARING BD355520 DTK

Overview of BD355520 DTK AC Compressor Ball Bearing

The BD355520 DTK is a sealed deep-groove ball bearing designed expressly for automotive air-conditioning compressors. Its robust sealing, integrated snap-ring groove, and high-performance cage material ensure long life and minimal maintenance under the demanding thermal and lubrication cycles of modern HVAC systems.

Technical Specifications

• Bore (d): 35 mm

• Outer Diameter (D): 55 mm

• Width (B): 20 mm

• Dynamic Radial Load Rating: ≈12 500 N

• Static Radial Load Rating: ≈7 800 N

• Maximum Limiting Speed: 18 000 RPM

• Typical Mass: ~0.13 kg

Materials & Construction

• Rings & Balls: High-carbon chromium bearing steel for excellent fatigue resistance.

• Cage (T): Glass-fiber–reinforced nylon offering tight ball guidance, low friction, and resistance to temperature extremes.

• Seals (D): Dual-contact nitrile rubber seals on both sides, formulated to repel refrigerant and compressor oil while retaining grease.

• Snap-Ring Groove (K): Integrated groove and matching snap ring facilitate secure axial location without separate retaining hardware.

• Lubrication: Factory-packed with a polyurea-based grease compatible with PAG and POE refrigerant oils.

• Internal Clearance: C3 specification to accommodate thermal expansion and high-speed operation.

Performance Highlights

1. Refrigerant-Resistant Sealing
   Dual-lip seals keep out moisture and debris while preventing refrigerant migration, extending seal life.

2. Thermal Stability
   Cage and seal materials remain dimensionally stable across –40 °C to +130 °C, ensuring consistent preload.

3. Low Noise & Vibration
   Precision raceway grinding and a nylon cage reduce bearing whine and run-out for quieter compressor operation.

4. Maintenance-Free Service
   Pre-filled grease and contamination-resistant sealing eliminate the need for mid-life relubrication in sealed compressor housings.

Typical Applications

• Reciprocating and scroll-type automotive A/C compressors

• Light-truck and off-road vehicle HVAC units

• Aftermarket replacement compressors

• Stationary refrigeration compressors where compact, sealed bearings are mandated

Cross-Reference Guidance

While the BD355520 DTK is a proprietary compressor bearing, many OEM and aftermarket compressors use equivalent 35×55×20 mm sealed bearings. When sourcing replacements, look for bearings featuring:

• Dual rubber seals (2RS or equivalent)

• Nylon/polyamide cage

• Snap-ring groove (K suffix)

• C3 internal clearance

Always verify the compressor manufacturer’s service manual for the exact part number and any required adapter or spacer rings.

• Contact the sales department for more information.