This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1170STC, 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 SI40X1170STC
The AirTAC SI40 Standard Cylinder SI40X1170STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1170mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1170STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1170 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1170STC
- 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 SI40X1170STC
The AirTAC SI40X1170STC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1170mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40X1170STC. This direct SAI upgrade shares the exact ISO 15552 mounting interface, M12x1.25 rod thread, and 27mm cushions. The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Because this 1170mm stroke exceeds the 1200mm standard maximum, it is a nonstandard stroke requiring external guides to prevent rod bending. The -S magnet works with legacy CS1-B/DS1-B sensors. Note that a plain cylinder drifts on air loss; use a SAIL lock or pilot check valve for load holding.
Airtac SI40 Standard Cylinder SI40X1170STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1170STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1170STC |
| Bore size | Ø40 mm |
| Stroke | 1170 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 SAI40X1170STC 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 SAI40X1170STC 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 SI40X1170STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1170 | 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 SI40X1170STC Is Used
Vertical Lift Gates
Raises and lowers access doors or safety barriers up to 32kg, benefiting from the 30-800mm/s speed range and adjustable 27mm end cushions to soften stops.
Actuator Positioning
Shifts diverter arms or sorting flaps along long conveyors, using the -S magnet with CS1-B/DS1-B switches to confirm end-of-stroke arrival.
Replacing the Airtac SI40 Standard Cylinder SI40X1170STC with the SAI40X1170STC
To replace the discontinued SI40X1170STC, order the SAI40X1170STC. Confirm the TC trunnion mount, G1/4 port, M12x1.25 rod thread, and the -S magnet for CS1-B/DS1-B switches. The SAI is dimensionally interchangeable per ISO 15552. Since the 1170mm stroke is nonstandard and long, you must use external guides to prevent rod bending and side-load damage. For sizing both ways: a 32mm bore gives 402N push at 0.5MPa, while a 50mm bore gives 982N. A plain cylinder does not hold load without live air; for holding, use the SAIL air-released lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1170STC
- ✓ 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 SI40X1170STC FAQ
Yes, the SI40X1170STC is discontinued. The direct replacement is the SAI40X1170STC. It shares the same ISO 15552 mounting interface, 40mm bore, 1170mm stroke, G1/4 port, and output force, fitting existing fixtures directly.
It features a G1/4 air port. The force output is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1170STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1170STC replacement — usually within 7-8 hours.