BOCK FK40 390K Bus AC Compressor
MultiStar Parts – Your Source for Bus Air Conditioner Parts
The BOCK FK40 390K is a 4-cylinder open-drive reciprocating compressor from the FK series, designed for air conditioning (K-design) in buses and rail vehicles . It is a globally recognized market leader in vehicle compressors, with decades of field-proven reliability in commercial passenger transport .
CROSS-REFERENCE PART NUMBERS:
- FKX40/390K
Model
FK40 390K (also FKX40/390 K)
Cylinders
4 (V-configuration)
Displacement
385 cm³
Bore x Stroke
50 x 49 mm
Speed Range (K-design)
500 – 3,500 rpm
Weight (without clutch)
~33 kg
Oil charge
2.0 L (BOCKlub E55)
Suction connection
28 mm (1 1/8″)
Discharge connection
22 mm (7/8″)
Max. pressure (HP/LP)
28 / 19 bar
Refrigerants
R134a, R407C, R513A
The BOCK FK40 390K is widely used as the standard compressor for 7m to 13.5m city buses, coaches, and double-decker buses .
Recommended Magnetic Clutches
Bock FK40 Compressor Clutch
Magnetic Clutch for Bock Compressor FK40 —- ( FKX40 390K, 470K, 560K, 655K )
→ BK 2A2B 260*220 Clutch
→ BK 2A2B 235*210 Clutch
→ BK 2B 210 Clutch
→ BK 2B 220 Clutch
→ 10PK180 Clutch
Multistar Parts Co., Ltd. – Your trusted partner for bus air conditioning compressors and complete HVAC spare parts. OEM-grade quality, competitive pricing, global shipping from China.