Walk into any AC parts market and you'll hear compressors called by series codes: "a 5H091", "a 7SBU16C", "a 10PA17C". These codes describe the compressor's architecture and displacement — and once you can read them, you can serve almost any customer who walks in with a failed unit. Here's the decoder.
Where the codes come from
Most series codes trace back to four OEM engineering families: Denso (10P, 10S, 10PA…), Sanden (SD5H, SD7H, TR…), Calsonic Kansei / Zexel (DKS, DKS-15/17, CRC…), and Seiko-Seiki (TR, piston variants). The aftermarket adopted the codes because a "7SBU16C" is a 7-cylinder, swash-plate (SBU = swipe/piston family), 16cc displacement, C-version compressor — regardless of which brand built it.
The families at a glance
| Series / family | Architecture | Displacement | Classic applications |
|---|---|---|---|
| SD5H / 5H (5H091, 5H11…) | 5-cyl swash plate | ~87–161 cm³/r | Universal aftermarket, Asian cars, small trucks |
| SD7H / 7H (7H13, 7H15) | 7-cyl swash plate | 129–155 cm³/r | Toyota, Honda, Kia, Hyundai |
| 5V / V-56~V-60 | 5-cyl variable | 10–160 cm³/r (var.) | Modern sedans with electronic control |
| 7SBU16C | 7-cyl variable swash | 8–161 cm³/r (var.) | Widely used across Asian platforms |
| 7V16 | 7-cyl variable | 10–160 cm³/r (var.) | Later-model Asian and some EU vehicles |
| DKS-15S / 17S | 6-cyl wobble | 147–165 cm³/r | Nissan family, construction machinery |
| 10PA (15C/17C) | 10-cyl wobble | 155–178 cm³/r | Toyota/Lexus workhorses, Honda |
| 10S (11C/15L/17C) | 10-cyl wobble | 116–188 cm³/r | Toyota Hiace, Hilux, many SUVs |
| FS10 | 10-cyl wobble | 170 cm³/r | Ford, GM pickups and SUVs |
Fixed vs variable — why it matters more than brand
A variable-displacement compressor (5V, 7V16, 7SBU16C) changes its stroke continuously via an internal control valve; a fixed one (5H, 7H, 10PA, DKS, 10S, FS10) pumps full stroke every revolution, cycling the clutch on/off to regulate temperature. Substituting one architecture for the other changes refrigerant flow behavior and control logic — always match the family, then match displacement, then configure the clutch (diameter, grooves, 12V/24V).
Displacement decoding: the numbers after the letters
- 5H091 → 5H family, ≈ 91 cm³/r
- 10PA17C → 10PA family, ≈ 178 cm³/r (the "17" rounds up 17.8)
- 7SBU16C → 7-cylinder SBU, ≈ 160 cm³/r max, C revision
- DKS-17S → DKS family, ≈ 165 cm³/r, S = standard suction
When a customer gives you only the code, you already know the displacement, refrigerant era, and clutch options — quote in seconds instead of hours.
Excavator and commercial-vehicle compressors
Construction machinery is a premium niche: CAT, Komatsu, Hitachi, Doosan, Volvo and Sumitomo machines run specific families (10S17C on CAT330C, DKS15CA on Komatsu PC200, 709 series on Volvo EC210…). Margins are higher because parts distribution is thinner. Our compressor catalog lists these by machine model with groove counts and OE part numbers.
What to check when buying aftermarket compressors
- Series + displacement match (the table above).
- Clutch configuration — 4PK/6PK/8PK, diameter, coil voltage. Most quality suppliers configure per order.
- 100% testing — noise, leakage and displacement at rated speed, documented.
- Port positions and mounting ears — photograph the original unit and compare.
Need compressors by series or application?
NIKACOOL supplies the full series range — fixed and variable, 12V and 24V, passenger car and excavator — with configurable clutches and 12-month warranty.
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