This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X750S, 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 SI40X750S
The AirTAC Airtac SI40 Standard Cylinder SI40X750S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 750mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X750S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke750 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X750S
- 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 SI40X750S
The AirTAC SI40X750S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 750mm stroke, and a G1/4 air port. Delivering 628N push force at 0.5MPa, it is directly replaced by the SAI40X750S direct upgrade.
The SAI successor retains identical ISO 15552 mounting dimensions, force, and port size, but introduces an upgraded piston seal with two Y-shaped elements for lower start-up pressure. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X750S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X750S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X750S |
| Bore size | Ø40 mm |
| Stroke | 750 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 SAI40X750S 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 SAI40X750S 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 SI40X750S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×750 | 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 SI40X750S Is Used
Long-Stroke Diversion
Pushes packages across a 750mm conveyor lane using the 628N force, requiring external guides to prevent rod bending.
Pallet Push-Off
Transfers goods onto pallets where the 40mm bore provides adequate thrust without overwhelming the packaging.
Replacing the Airtac SI40 Standard Cylinder SI40X750S with the SAI40X750S
To replace the SI40X750S, order the SAI40X750S and verify your ISO 15552 mounting interface, 40mm bore, 750mm stroke, G1/4 port (PT/G/NPT), and accessory type. Because the 750mm stroke exceeds 300mm, use an external guide to prevent rod bending and side-load damage. The SAI family also offers SAIL, SAIF, and BSAI variants for integrated locking or valving. If sizing alternatives, consider the 32mm bore (402N @0.5MPa) or 50mm bore (982N @0.5MPa). A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X750S
- ✓ 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 SI40X750S FAQ
Yes, the SI40X750S is discontinued. The direct replacement is the SAI40X750S, which shares identical ISO 15552 mounting dimensions, 40mm bore, 750mm stroke, output force, and G1/4 port.
It features a G1/4 air port and provides 628N push / 528N pull at 0.5MPa, 879N push at 0.7MPa, and a maximum theoretical force of 128kgf at 1.0MPa. The 750mm stroke requires external guiding to manage side loads.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X750S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X750S replacement — usually within 7-8 hours.