This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1500STC, 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 SI40X1500STC
The AirTAC Airtac SI40 Standard Cylinder SI40X1500STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1500STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1500STC
- 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 SI40X1500STC
The AirTAC SI40X1500STC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1500mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, this legacy unit is replaced by the direct replacement SAI40X1500STC. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF and BSAI variants the SI lacked.
Because 1500mm exceeds the 1200mm standard maximum for this bore, this is a non-standard made-to-order stroke requiring external guides to prevent rod bending. The -S magnet supports CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. Rod material options include carbon steel, SUS420J2 or SUS304, and Viton H seals raise the temperature range to 0-150C.
Airtac SI40 Standard Cylinder SI40X1500STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1500STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1500STC |
| Bore size | Ø40 mm |
| Stroke | 1500 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 SAI40X1500STC 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 SAI40X1500STC 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 SI40X1500STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1500 | 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 SI40X1500STC Is Used
Long-Reach Diverting
Drives a sorting arm across a wide conveyor belt, utilizing the full 1500mm stroke to push packages into lateral lanes.
High-Bay Extraction
Extracts totes from deep shelving units in automated storage systems, requiring external guides to stabilize the extended rod.
Material Lowering
Lowers components down a 1.5m vertical descent, relying on a pilot check valve to hold the load safely when air is removed.
Replacing the Airtac SI40 Standard Cylinder SI40X1500STC with the SAI40X1500STC
To replace the SI40X1500STC, order the SAI40X1500STC. Confirm the ISO 15552 TC trunnion mounting interface, 40mm bore, 1500mm non-standard stroke, G1/4 port, and -S magnet. The SAI family adds the SAIF integrated 4M valve (bores 32-100) and SAIL or BSAI lock variants. A plain cylinder drifts without live air; the cushion only decelerates, so use an external rod lock or pilot check valve for load holding. For sizing, the neighbouring 50mm bore offers 982N push at 0.5MPa. At 1500mm stroke, external guides are mandatory to manage side-load and rod-bending risks.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1500STC
- ✓ 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 SI40X1500STC FAQ
Yes, the SI40X1500STC is discontinued. The direct replacement is the SAI40X1500STC. It shares the same ISO 15552 mounting interface, 40mm bore, 1500mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
The G1/4 port bore delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. The 1500mm stroke exceeds the 1200mm standard maximum, making it a non-standard made-to-order item.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1500STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1500STC replacement — usually within 7-8 hours.