This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1520S, 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 SI40X1520S
The AirTAC Airtac SI40 Standard Cylinder SI40X1520S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1520mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1520S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1520 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1520S
- 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 SI40X1520S
The AirTAC SI40X1520S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1520mm stroke. Generating 628N push force at 0.5MPa, it is replaced by the direct replacement SAI40X1520S. The SAI upgrade retains the G1/4 port and M12x1.25 thread but adds two Y-shaped one-way piston seals for lower start-up pressure and longer life.
Because the 1520mm stroke exceeds the 1200mm standard maximum, this is a non-standard made-to-order unit requiring external guides to prevent rod bending. The -S magnet supports legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X1520S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1520S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1520S |
| Bore size | Ø40 mm |
| Stroke | 1520 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 SAI40X1520S 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 SAI40X1520S 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 SI40X1520S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1520 | 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 SI40X1520S Is Used
Long-Stroke Diversion
Pushes packages across a wide conveyor belt sorting lane using the full 1520mm travel distance.
Material Lowering
Lowers lightweight components down a multi-tier assembly stack, relying on external guides to prevent rod bending.
Replacing the Airtac SI40 Standard Cylinder SI40X1520S with the SAI40X1520S
To replace this discontinued SI40X1520S, order the SAI40X1520S. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/4 port, and the -S magnet for CS1-B/DS1-B switches. For sizing, the 40mm bore yields 628N push at 0.5MPa; if less force is needed, a 32mm bore provides 402N. For higher loads, a 50mm bore offers 982N. Note that 1520mm exceeds the 1200mm standard stroke limit, making it non-standard; at this length, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts without air and the cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1520S
- ✓ 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 SI40X1520S FAQ
Yes, the SI40X1520S is discontinued. The direct replacement is the SAI40X1520S. It shares the same ISO 15552 mounting interface, 40mm bore, 1520mm stroke, force, G1/4 port, and accessories, fitting directly into existing fixtures.
The bore is 40mm with a G1/4 air port. Force ratings are: 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 SAI40X1520S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1520S replacement — usually within 7-8 hours.