This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1180S, 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 SI40X1180S
The AirTAC Airtac SI40 Standard Cylinder SI40X1180S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1180mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1180S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1180 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1180S
- 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 SI40X1180S
The AirTAC SI40X1180S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1180mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X1180S, matching the exact bore, stroke, force, port, and ISO 15552 mounting interface.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The SI-S magnet supports legacy CS1-B/DS1-B sensors, while SAI uses current switches. A 1180mm stroke exceeds the 1200mm standard max, requiring external guides to prevent rod bending.
Airtac SI40 Standard Cylinder SI40X1180S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1180S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1180S |
| Bore size | Ø40 mm |
| Stroke | 1180 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 SAI40X1180S 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 SAI40X1180S 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 SI40X1180S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1180 | 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 SI40X1180S Is Used
Long-Stroke Diversion
Pushes packages across a conveyor lane over 1180mm, utilizing the 628N push force to reliably redirect heavy cartons at high speeds.
Automated Door Actuation
Opens large industrial machine guard doors over a 1180mm travel distance, requiring external guides to prevent side-load rod bending.
Replacing the Airtac SI40 Standard Cylinder SI40X1180S with the SAI40X1180S
To replace the SI40X1180S, order the SAI40X1180S. Verify the ISO 15552 mounting interface, G1/4 port, M12x1.25 rod thread, and the -S magnet for position sensing. Sizing options: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. Note that 1180mm is a nonstandard stroke exceeding typical limits; always use an external guide to prevent rod bending over this length. A plain cylinder does not hold load without live air—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1180S
- ✓ 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 SI40X1180S FAQ
Yes, the AirTAC SI40X1180S is discontinued. The direct replacement is the SAI40X1180S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 1180mm stroke, 628N force, G1/4 port, and mounting interface.
The 40mm bore uses a G1/4 port. At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa push is 879N, and at 0.9MPa push is 1130N. The theoretical maximum force is 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1180S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1180S replacement — usually within 7-8 hours.