This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X700SN, 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 SI40X700SN
The AirTAC Airtac SI40 Standard Cylinder SI40X700SN 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 SAI40X700SN, 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 → SAI40X700SN
- 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 SI40X700SN
The AirTAC SI40X700SN is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 700mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is directly replaced by the SAI40X700SN. This direct successor shares the exact ISO 15552 mounting interface, bore, stroke, force and port, fitting existing fixtures perfectly.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For holding loads without live air, the SAI family introduces SAIL lock and BSAI clamp-lock variants the SI lacked. This NBR-sealed unit operates from -20 to +70C, and the magnet supports CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X700SN Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X700SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X700SN |
| 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 SAI40X700SN 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 SAI40X700SN 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 SI40X700SN
| 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 SI40X700SN Is Used
Carton Diverting
Pushes light packages on a packaging line using the 628N push force, with the 700mm stroke reaching across a conveyor belt.
Parts Ejection
Ejects machined components from a fixture, relying on the 27mm adjustable air cushions to decelerate at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40X700SN with the SAI40X700SN
To replace the SI40X700SN, order the SAI40X700SN. Verify the ISO 15552 mounting interface, 40mm bore, 700mm stroke, G1/4 port (PT/G/NPT threads), and mounting accessory. The S suffix denotes a piston magnet for CS1-B/DS1-B switches, while N specifies the NBR seal. Sizing both ways: a 32mm bore yields 402N push at 0.5MPa, and a 50mm bore yields 982N. If you need to hold a load on air loss, note that a plain cylinder drifts and its cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 700mm stroke is long, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X700SN
- ✓ 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 SI40X700SN FAQ
Yes, the SI40X700SN is discontinued. The direct replacement is the SAI40X700SN. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 700mm stroke, 628N force, G1/4 port and mounting interface.
At 0.5MPa it provides 628N push and 528N pull. At 0.7MPa push is 879N, and at 0.9MPa it is 1130N. The theoretical max force is 128kgf at 1.0MPa. Operating speed is 30-800mm/s, the rod is 16mm with an M12x1.25 thread, and air cushions are 27mm.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X700SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X700SN replacement — usually within 7-8 hours.