This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X700, 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 SI40X700
The AirTAC Airtac SI40 Standard Cylinder SI40X700 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 SAI40X700, 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 → SAI40X700
- 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 SI40X700
The AirTAC SI40X700 is a discontinued double-acting ISO 15552 profile cylinder offering 628 N push force at 0.5 MPa through a 40 mm bore and 700 mm stroke. It is replaced by the SAI40X700, a direct upgrade sharing the same interface, G1/4 port, and M12x1.25 rod thread.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X700 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X700 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X700 |
| 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 SAI40X700 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 SAI40X700 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 SI40X700
| 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 SI40X700 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 700 mm travel, relying on the adjustable 27 mm cushions to decelerate the 40 mm bore at cycle end.
Component Ejection
Extracts machined parts from fixtures where a 40 mm bore provides adequate push force without requiring a larger footprint.
Replacing the Airtac SI40 Standard Cylinder SI40X700 with the SAI40X700
To replace the SI40X700, order the SAI40X700 to retain the exact ISO 15552 mounting dimensions, 700 mm stroke, and G1/4 port. If you need position sensing, select an SAI model with the magnet option, as this legacy SKU cannot take a switch. For higher loads, the 50 mm bore yields 982 N push at 0.5 MPa; for lighter duties, the 32 mm bore gives 402 N. Because this is a 700 mm stroke, use external guides to prevent rod bending and side-load damage. The cushion only decelerates the piston; it does not hold load on air loss. For secure holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X700
- ✓ 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 SI40X700 FAQ
Yes, the AirTAC SI40X700 is discontinued. The direct replacement is the SAI40X700. It is dimensionally interchangeable per ISO 15552, keeping the same 40 mm bore, 700 mm stroke, output force, G1/4 port, and mounting accessories.
The bore is 40 mm with a G1/4 air port and M12x1.25 rod thread. It delivers 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 max of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Request a Quote for the SAI40X700
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X700 replacement — usually within 7-8 hours.