This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X745S, 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 SI40X745S
The AirTAC Airtac SI40 Standard Cylinder SI40X745S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 745mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X745S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke745 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X745S
- 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 SI40X745S
The AirTAC SI40X745S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 745mm stroke, G1/4 port, and 628N push force at 0.5MPa. AirTAC replaced this legacy unit with the SAI40X745S, a direct upgrade retaining the exact mounting interface, output, and dimensions.
The SAI replacement introduces an upgraded piston seal using two Y-shaped one-way elements for lower start-up pressure and longer life. It also adds SAIL, SAIF, and BSAI lock variants absent in the SI line. The original -S magnet supports CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X745S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X745S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X745S |
| Bore size | Ø40 mm |
| Stroke | 745 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 SAI40X745S 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 SAI40X745S 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 SI40X745S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×745 | 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 SI40X745S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with its 745mm reach, requiring external guides to prevent rod bending during lateral extension.
Pneumatic Positioning
Shifts tooling carriages between stations, relying on the built-in magnet for end-of-stroke confirmation with CS1-B switches.
Replacing the Airtac SI40 Standard Cylinder SI40X745S with the SAI40X745S
To replace the SI40X745S, order the SAI40X745S, confirming the ISO 15552 interface, 40mm bore, 745mm stroke, G1/4 port (PT/G/NPT thread options), and mounting accessory. Because the 745mm stroke is long, use external guides to prevent rod bending and side-load damage. If sizing alternatives, the neighbouring 32mm bore yields 402N push at 0.5MPa, while the 50mm bore yields 982N. Note that a plain cylinder drifts on air loss; for load holding, specify the SAIL lock variant, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X745S
- ✓ 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 SI40X745S FAQ
Yes, the SI40X745S is discontinued. The direct replacement is the SAI40X745S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 745mm stroke, G1/4 port, and mounting fixtures.
The 40mm bore features a G1/4 port. It delivers 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 SAI40X745S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X745S replacement — usually within 7-8 hours.