This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1500S, 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 SI40X1500S
The AirTAC Airtac SI40 Standard Cylinder SI40X1500S 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 SAI40X1500S, 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 → SAI40X1500S
- 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 SI40X1500S
The AirTAC SI40X1500S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1500mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. Because 1500mm exceeds the 1200mm standard maximum for this bore, it is a non-standard made-to-order item. AirTAC replaced the SI family with the SAI series; the direct replacement is the SAI40X1500S, matching the interface, bore, stroke, force, port and mounting.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S suffix means a piston magnet for CS1-B/DS1-B switches; the SAI replacement uses current AirTAC switches. For load holding, note the SAIL lock or BSAI clamp-lock variants are available if needed.
Airtac SI40 Standard Cylinder SI40X1500S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1500S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1500S |
| 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 SAI40X1500S 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 SAI40X1500S 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 SI40X1500S
| 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 SI40X1500S Is Used
Long-Reach Transfer
Pushes products across wide conveyor gaps using the full 1500mm stroke, guided externally to prevent rod bending.
High-Bay Pusher
Actuates storage diverters at height, relying on the 628N push force to shift totes along gravity rollers.
Vertical Lowering
Lowers light fixtures safely; a pilot check valve is added since the cushion only decelerates at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40X1500S with the SAI40X1500S
To replace the SI40X1500S, order the SAI40X1500S. Confirm the ISO 15552 mounting interface, the 40mm bore, the 1500mm non-standard stroke, the G1/4 port (PT/G/NPT thread options), and the mounting accessory (LB, FA, CA, TC). The -S magnet is required for position sensing. When sizing, a 50mm bore gives 982N push at 0.5MPa, while a 32mm bore gives 402N. A plain cylinder drifts on air loss; the cushion only decelerates. For held loads, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 1500mm, prevent rod bending and side-load damage with an external guide.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1500S
- ✓ 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 SI40X1500S FAQ
Yes, the SI40X1500S is discontinued. The direct replacement is the SAI40X1500S. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 1500mm stroke, 628N force, G1/4 port and mounting fixtures.
The 40mm bore uses a G1/4 port. It generates 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. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1500S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1500S replacement — usually within 7-8 hours.