This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX750S, 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 SI40AX750S
The AirTAC SI40 Standard Cylinder SI40AX750S 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 SAI40AX750S, 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 → SAI40AX750S
- 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 SI40AX750S
The AirTAC SI40AX750S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 750 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40AX750S, matching the bore, stroke, force, and mounting interface.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. The -A suffix specifies a SUS420J2 stainless rod, and the -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40AX750S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX750S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX750S |
| 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 SAI40AX750S 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 SAI40AX750S 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 SI40AX750S
| 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 SI40AX750S Is Used
Long-Stroke Diversion
Pushes packages across a 750 mm transfer belt using the 628 N force, guided externally to prevent rod bending.
Pneumatic Slide Table
Actuates a tooling carriage 750 mm forward and back, relying on the adjustable 27 mm air cushions to decelerate.
Replacing the Airtac SI40 Standard Cylinder SI40AX750S with the SAI40AX750S
To replace the SI40AX750S, order the SAI40AX750S. Verify the ISO 15552 mounting interface, 40 mm bore, 750 mm stroke, G1/4 port, and SUS420J2 stainless rod. The built-in magnet (-S) requires current AirTAC switches, replacing the legacy CS1-B/DS1-B. If you need more force, the 50 mm bore offers 982 N push at 0.5 MPa; if less is acceptable, the 32 mm bore provides 402 N. Because this is a 750 mm stroke, support the load with external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss, so for load holding use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX750S
- ✓ 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 SI40AX750S FAQ
Yes, the SI40AX750S is discontinued. The direct replacement is the SAI40AX750S. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 750 mm stroke, force, and G1/4 port.
It has a G1/4 port. Force ratings are 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, and a theoretical maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX750S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX750S replacement — usually within 7-8 hours.