This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X63S, 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 SI40 Standard Cylinder SI40X63S
The AirTAC Airtac SI40 Standard Cylinder SI40X63S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 63mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X63S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke63 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X63S
- 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 SI40 Standard Cylinder SI40X63S
The AirTAC SI40X63S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 63 mm stroke, delivering 628 N push force at 0.5 MPa through its G1/4 port. AirTAC replaced this legacy unit with the SAI40X63S, a direct upgrade retaining the exact interface, M12x1.25 rod thread, and 27 mm cushions.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent from the SI line.
Airtac SI40 Standard Cylinder SI40X63S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X63S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X63S |
| Bore size | Ø40 mm |
| Stroke | 63 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40X63S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40X63S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40X63S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×63 | 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 SI40 Standard Cylinder SI40X63S Is Used
Package Diversion
Pushes lightweight cartons off a sorting line using 628 N thrust, fitting neatly into existing ISO 15552 fixture spacing.
Clamp Actuation
Secures medium workpieces during machining, providing 528 N pull force at 0.5 MPa for reliable hold-back operations.
Stopper Gate
Functions as a pneumatic stop in material handling tracks, easily retrofitted via standard FA/FB flange mounting.
Replacing the Airtac SI40 Standard Cylinder SI40X63S with the SAI40X63S
To replace the SI40X63S, order the SAI40X63S and confirm the ISO 15552 mounting interface, 63 mm stroke, G1/4 port (PT/G/NPT), and the -S magnet for CS1-B/DS1-B sensors. If you need more force, the neighbouring 50 mm bore provides 982 N push at 0.5 MPa; if less is required, the 32 mm bore offers 402 N. Remember that a plain cylinder drifts without live air—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or explore the SAIL/BSAI lock variants. The SAIF self-valve option is also available for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X63S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40X63S FAQ
Yes, the SI40X63S is discontinued. The direct replacement is the SAI40X63S. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 63 mm stroke, output force, G1/4 port, and mounting accessories.
The bore features a G1/4 port. At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa push is 879 N, and at 0.9 MPa it is 1130 N. The theoretical maximum force is 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X63S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X63S replacement — usually within 7-8 hours.