This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1200STC, 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 SI40X1200STC
The AirTAC Airtac SI40 Standard Cylinder SI40X1200STC 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 SAI40X1200STC, 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 → SAI40X1200STC
- 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 SI40X1200STC
The AirTAC SI40X1200STC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1200mm stroke. It delivers 628N push and 528N pull at 0.5MPa. The direct replacement is the SAI40X1200STC, which shares the exact ISO 15552 mounting interface, G1/4 port, and M12x1.25 rod thread for seamless fixture integration.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X1200STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1200STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1200STC |
| 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 SAI40X1200STC 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 SAI40X1200STC 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 SI40X1200STC
| 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 SI40X1200STC Is Used
Long-Stroke Transfer
Pushes workpieces between machining stations over a 1200mm travel distance using a 628N push force at 0.5MPa.
High-Reach Ejection
Ejects packaged goods from elevated shelving, requiring external guides to manage the long 1200mm rod extension safely.
Vertical Lowering
Lowers assemblies with a 32kg vertical lift capacity, relying on a pilot check valve to hold the load securely.
Replacing the Airtac SI40 Standard Cylinder SI40X1200STC with the SAI40X1200STC
To replace this SI40X1200STC, order the SAI40X1200STC keeping the TC trunnion mount, S magnet, and G1/4 port. Because this is a 1200mm stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding use an external rod lock or the SAIL/BSAI lock variant. Size both ways: if 628N at 0.5MPa is insufficient, step up to the 50mm bore (982N), or drop to 32mm (402N) for lighter loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1200STC
- ✓ 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 SI40X1200STC FAQ
Yes, the SI40X1200STC is discontinued. The direct replacement is the SAI40X1200STC, matching the ISO 15552 interface, TC mount, G1/4 port, and stroke.
It has a G1/4 port. Forces are: 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N at 0.9MPa, and a max of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1200STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1200STC replacement — usually within 7-8 hours.