This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI32X550S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI32 Standard Air Cylinder SI32X550S
The AirTAC SI32 Standard Air Cylinder SI32X550S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø32mm bore and 550mm stroke, G1/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI32X550S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ32 mm
- Stroke550 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- StatusDiscontinued → SAI32X550S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI32 Standard Air Cylinder SI32X550S
The AirTAC SI32X550S is a discontinued double-acting ISO 15552 profile cylinder with a 32mm bore and 550mm stroke. Delivering 402N push force at 0.5MPa, it is directly replaced by the SAI32X550S. This direct upgrade matches the G1/8 port, M10x1.25 thread, and mounting interface, fitting existing fixtures perfectly.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI32 Standard Air Cylinder SI32X550S Technical Specifications
| Model | Airtac SI32 Standard Air Cylinder SI32X550S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI32X550S |
| Bore size | Ø32 mm |
| Stroke | 550 mm |
| Acting type | Double acting |
| Port size | G1/8 |
| Rod thread | M10×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1000 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI32X550S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø32mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 402 N | 346 N |
| 0.7 MPa | 563 N | — |
| Max (@1.0 MPa) | 82 kgf | |
The SAI32X550S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI32 Standard Air Cylinder SI32X550S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 32 | Bore size in mm. |
| ×550 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI32 Standard Air Cylinder SI32X550S Is Used
Light-Part Diversion
Ideal for pushing small packages or light components on a 32mm bore conveyor line, utilizing the 550mm stroke to reach across wider belts.
Compact Ejection
Provides reliable ejection of lightweight molded parts from machinery, where the 402N push force at 0.5MPa is sufficient for low-mass payloads.
Replacing the Airtac SI32 Standard Air Cylinder SI32X550S with the SAI32X550S
To replace the SI32X550S, order the SAI32X550S. Confirm the ISO 15552 mounting interface, 32mm bore, 550mm stroke, G1/8 port (PT/G/NPT), and accessory type. The -S magnet enables CS1-B/DS1-B switches. Sizing both ways: a 40mm bore gives 628N push at 0.5MPa, while dropping to 0.3MPa yields 241N. For this 550mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve, or select the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI32X550S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI32 Standard Air Cylinder SI32X550S FAQ
Yes, the SI32X550S is discontinued. The direct replacement is the AirTAC SAI32X550S. It is dimensionally interchangeable per ISO 15552, maintaining the same 32mm bore, 550mm stroke, G1/8 port, and mounting interface.
This 32mm bore double-acting cylinder has a G1/8 port. It delivers 402N push and 345N pull at 0.5MPa, 563N push at 0.7MPa, 724N push at 0.9MPa, and a theoretical maximum force of 82kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI32X550S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI32X550S replacement — usually within 7-8 hours.