This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X700S, 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 SI40X700S
The AirTAC Airtac SI40 Standard Cylinder SI40X700S 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 SAI40X700S, 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 → SAI40X700S
- 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 SI40X700S
The AirTAC SI40X700S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 700mm stroke. Delivering 628N push force at 0.5MPa through a G1/4 port, it is directly replaced by the SAI40X700S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, output force, port size and accessories, fitting existing fixtures perfectly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. It also introduces SAIL, SAIF and BSAI variants absent from the SI line. The S magnet works with legacy CS1-B/DS1-B sensors, while rod options include carbon steel, SUS420J2 or SUS304.
Airtac SI40 Standard Cylinder SI40X700S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X700S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X700S |
| 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 SAI40X700S 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 SAI40X700S 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 SI40X700S
| 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 SI40X700S Is Used
Long-Stroke Diversion
Pushes packages across a 700mm conveyor belt transfer using the 628N force at 0.5MPa, guided externally to prevent rod bending.
Material Ejection
Ejects machined aluminium parts from a fixture, utilizing the adjustable 27mm air cushions at both ends to decelerate the stroke smoothly.
Replacing the Airtac SI40 Standard Cylinder SI40X700S with the SAI40X700S
To replace the SI40X700S, order the SAI40X700S. Verify the ISO 15552 mounting interface, 40mm bore, 700mm stroke, G1/4 port (PT/G/NPT threads), and mounting accessory. The S suffix indicates a piston magnet for CS1-B/DS1-B switches; the SAI uses current AirTAC switches. If sizing up or down, neighbouring bores are 32mm and 50mm. At 0.5MPa, the 32mm bore yields 402N push, while the 50mm bore yields 982N. A plain cylinder drifts on air loss as the cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 700mm stroke exceeds 300mm, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X700S
- ✓ 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 SI40X700S FAQ
Yes, the AirTAC SI40X700S is discontinued. The direct replacement is the SAI40X700S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 700mm stroke, 628N force, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port, M12x1.25 rod thread, and 27mm adjustable cushions. Theoretical forces are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum of 128kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X700S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X700S replacement — usually within 7-8 hours.