This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X960S, 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 SI40X960S
The AirTAC Airtac SI40 Standard Cylinder SI40X960S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 960mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X960S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke960 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X960S
- 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 SI40X960S
The AirTAC SI40X960S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 960mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X960S, a direct upgrade retaining the exact interface, bore, stroke, force, and mounting accessories.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SI -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors. For load holding, note that a standard cylinder drifts without live air; use an external rod lock or pilot check valve.
Airtac SI40 Standard Cylinder SI40X960S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X960S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X960S |
| Bore size | Ø40 mm |
| Stroke | 960 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 SAI40X960S 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 SAI40X960S 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 SI40X960S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×960 | 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 SI40X960S Is Used
Long-Stroke Diverting
Drives sorting gates across wide conveyor belts using the 960mm stroke, relying on the 628N push force to actuate light packaging routing mechanisms.
Extended Reach Transfer
Pushes components between machine stations over a 960mm gap, utilizing the adjustable 27mm air cushions to decelerate the payload smoothly at travel ends.
Replacing the Airtac SI40 Standard Cylinder SI40X960S with the SAI40X960S
To replace the SI40X960S, order the SAI40X960S and verify the ISO 15552 mounting interface, 40mm bore, 960mm stroke, G1/4 port, and M12x1.25 rod thread. The -S magnet enables current AirTAC switches. If you need more force, the adjacent 50mm bore yields 982N push at 0.5MPa; if less is acceptable, the 32mm bore provides 402N. Because this is a 960mm long stroke, prevent rod bending by using external guides to manage side loads. For applications requiring locked positions, explore the SAIL or BSAI lock variants, as standard air cushions only decelerate at stroke ends and cannot hold a load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X960S
- ✓ 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 SI40X960S FAQ
Yes, the SI40X960S is discontinued. The direct replacement is the AirTAC SAI40X960S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 960mm stroke, G1/4 port, and mounting interface, so it drops directly into existing fixtures.
This double-acting cylinder operates at 30-800 mm/s with a G1/4 port and M12x1.25 rod thread. The force ratings are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X960S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X960S replacement — usually within 7-8 hours.