This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X760SN, 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 SI40X760SN
The AirTAC Airtac SI40 Standard Cylinder SI40X760SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 760mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X760SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke760 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X760SN
- 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 SI40X760SN
The AirTAC SI40X760SN is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 760 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X760SN, a direct upgrade sharing the exact ISO 15552 mounting interface, stroke, and output force.
The SAI replacement features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The original SI utilized NBR seals (-N) rated for -20 to +70 C, with a Viton H option available for high-heat environments. For position feedback, this -S model includes a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SI40 Standard Cylinder SI40X760SN Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X760SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X760SN |
| Bore size | Ø40 mm |
| Stroke | 760 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 SAI40X760SN 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 SAI40X760SN 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 SI40X760SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×760 | 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 SI40X760SN Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 760 mm extension, relying on external guides to prevent rod bending during lateral diversion.
Vertical Lift Gates
Raises lightweight access panels or doors up to 32 kg, requiring a pilot-operated check valve to hold the load securely if air pressure drops.
Parts Ejection
Cycles molded components out of machinery using 628 N of push force at 0.5 MPa, with adjustable 27 mm cushions softening the end stops.
Replacing the Airtac SI40 Standard Cylinder SI40X760SN with the SAI40X760SN
To replace the discontinued SI40X760SN, order the SAI40X760SN. Verify your ISO 15552 mounting fixture (LB, FA, CA, TC, etc.), the G1/4 air port, and the M12x1.25 rod thread. The -S magnet and -N NBR seal carry over directly. Because this is a 760 mm stroke, external guides are strongly recommended to prevent rod bending and side-load damage. If sizing up or down, neighboring bores are 32 mm (402 N push @0.5 MPa) and 50 mm (982 N push @0.5 MPa). Note that a standard cylinder drifts without live air; for load holding on valve center or air loss, use an external pilot check valve or explore the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X760SN
- ✓ 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 SI40X760SN FAQ
Yes, the SI40X760SN is discontinued. The direct replacement is the SAI40X760SN. It shares the same ISO 15552 mounting interface, 40 mm bore, 760 mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
The 40 mm bore uses a G1/4 air port. Force output is 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, with a theoretical maximum of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X760SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X760SN replacement — usually within 7-8 hours.