This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX700S, 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 SI40AX700S
The AirTAC SI40 Standard Cylinder SI40AX700S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 700mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX700S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke700 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX700S
- 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 SI40AX700S
The AirTAC SI40AX700S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 700mm stroke, and a SUS420J2 stainless steel rod. Delivering 628N push force at 0.5MPa, it is replaced by the SAI40AX700S. This direct upgrade maintains the exact ISO 15552 mounting interface, G1/4 port, and M12x1.25 rod thread, fitting existing fixtures perfectly.
The SAI successor introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The SAI family also adds SAIL lock, SAIF valve, and BSAI clamp-lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40AX700S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX700S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX700S |
| Bore size | Ø40 mm |
| Stroke | 700 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 SAI40AX700S 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 SAI40AX700S 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 SI40AX700S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×700 | 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 SI40AX700S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 700mm stroke, relying on external guides to prevent rod bending during lateral diversion.
Stainless Rod Ejection
Ejects components in humid storage environments using the SUS420J2 stainless rod option to resist corrosion over the extended travel.
Replacing the Airtac SI40 Standard Cylinder SI40AX700S with the SAI40AX700S
To replace the SI40AX700S, order the SAI40AX700S. Confirm the ISO 15552 mounting interface, 40mm bore, 700mm stroke, G1/4 port, and your specific mounting accessory. The -S magnet works with legacy CS1-B/DS1-B switches, though the SAI uses current AirTAC sensors. Sizing both ways: a 32mm bore offers 563N push @0.7MPa, while a 50mm bore provides 1374N. Note that a 700mm stroke requires external guides to prevent rod-bending side loads. A plain cylinder drifts without live air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX700S
- ✓ 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 SI40AX700S FAQ
Yes, the SI40AX700S is discontinued. The direct replacement is the SAI40AX700S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 700mm stroke, output force, G1/4 port, and mounting interface.
The G1/4 port bore delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. The air cushion is 27mm, and speed ranges 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX700S
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