This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1200S, 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 SI40X1200S
The AirTAC SI40 Standard Cylinder SI40X1200S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1200mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1200S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1200 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1200S
- 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 SI40X1200S
The AirTAC SI40X1200S is a discontinued double-acting ISO 15552 profile cylinder. It delivers 628 N push force at 0.5 MPa through a 40 mm bore and 1200 mm stroke, utilising a G1/4 air port. AirTAC replaced this legacy unit with the SAI40X1200S, a direct alternative retaining the exact ISO 15552 mounting interface, stroke, force, and porting.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for lower start-up pressure and extended life. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family introduces SAIL, SAIF, and BSAI lock variants absent in the original SI line.
Airtac SI40 Standard Cylinder SI40X1200S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1200S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1200S |
| Bore size | Ø40 mm |
| Stroke | 1200 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 SAI40X1200S 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 SAI40X1200S 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 SI40X1200S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1200 | 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 SI40X1200S Is Used
Long-Stroke Material Transfer
Pushes workpieces between processing stations over a 1200 mm travel distance where a 628 N thrust class is sufficient.
Film Web Handling
Shifts guiding rollers or cutting heads across wide material webs, benefiting from the 30-800 mm/s speed range.
Replacing the Airtac SI40 Standard Cylinder SI40X1200S with the SAI40X1200S
To replace the SI40X1200S, order the SAI40X1200S direct. Verify your ISO 15552 mounting fixtures (LB, FA, TC, etc.), the 40 mm bore, 1200 mm stroke, and G1/4 port threads (PT, G, or NPT). Because this is a 1200 mm stroke, external guides are strongly recommended to prevent rod bending and excessive side loads. For sizing, a 50 mm bore offers 982 N push at 0.5 MPa if more force is needed, while a 32 mm bore provides 402 N. Note that a standard cylinder drifts without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1200S
- ✓ 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 SI40X1200S FAQ
Yes, the SI40X1200S is discontinued. The direct replacement is the AirTAC SAI40X1200S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 1200 mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
This 40 mm bore double-acting cylinder features a G1/4 air port. It generates 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical maximum force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1200S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1200S replacement — usually within 7-8 hours.