This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1295S, 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 SI40X1295S
The AirTAC Airtac SI40 Standard Cylinder SI40X1295S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1295mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1295S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1295 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1295S
- 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 SI40X1295S
The AirTAC SI40X1295S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1295mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. Because 1295mm exceeds the 1200mm standard maximum for this bore, it is a non-standard made-to-order stroke. AirTAC replaced the SI line with the SAI family; the direct replacement is the SAI40X1295S, matching the interface, 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 SAI family also introduces SAIL, SAIF and BSAI lock variants absent from the SI line. This -S model has a piston magnet for CS1-B/DS1-B sensors; the SAI uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X1295S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1295S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1295S |
| Bore size | Ø40 mm |
| Stroke | 1295 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 SAI40X1295S 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 SAI40X1295S 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 SI40X1295S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1295 | 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 SI40X1295S Is Used
Long-Stroke Diversion
Drives large package pushers across wide conveyor belts, utilizing the 1295mm reach to sort heavy goods into downstream lanes.
High-Bay Extraction
Extracts pallets from deep storage racking where the extended stroke is required to fully clear the shelving before transfer.
Material Lowering
Lowers components into processing tanks, relying on the adjustable air cushions to decelerate the load smoothly at the stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40X1295S with the SAI40X1295S
To replace the SI40X1295S, order the SAI40X1295S. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the 40mm bore, 1295mm stroke, M12x1.25 rod thread and G1/4 port. Retain your mounting accessory (LB, FA, FB, TC, etc.) and confirm the -S magnet for position sensing. If you need to resize, neighbouring bores are 32mm and 50mm, with the 50mm yielding 982N push at 0.5MPa. Note that 1295mm is a non-standard stroke exceeding the 1200mm standard max; at this length you must use external guides to prevent rod bending and side-load damage. A plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1295S
- ✓ 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 SI40X1295S FAQ
Yes, the SI40X1295S is discontinued. The direct replacement is the SAI40X1295S. It is a true ISO 15552 profile cylinder with the same 40mm bore, 1295mm stroke, G1/4 port and mounting interface, so it drops directly into existing fixtures.
The G1/4 port bore delivers a push force of 628N and a pull force of 528N at 0.5MPa. At 0.7MPa the push force is 879N, and at 0.9MPa it is 1130N. The theoretical maximum force is 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1295S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1295S replacement — usually within 7-8 hours.