This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X70CA, 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 SI40X70CA
The AirTAC Airtac SI40 Standard Cylinder SI40X70CA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 70mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X70CA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X70CA
- 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 SI40X70CA
The AirTAC SI40X70CA is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 70 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X70CA, a direct upgrade retaining the exact ISO 15552 mounting interface, CA clevis, and output force.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Because this specific SI40X70CA SKU lacks the -S magnet, it cannot accept a position switch. For load-holding, note that standard cylinders drift without live air; consider the SAIL lock or BSAI clamp-lock variants.
Airtac SI40 Standard Cylinder SI40X70CA Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X70CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X70CA |
| Bore size | Ø40 mm |
| Stroke | 70 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 SAI40X70CA 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 SAI40X70CA 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 SI40X70CA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 SI40X70CA Is Used
Material Diverting
Ideal for actuating pivot arms on conveyor lines to sort packages using the 628 N push force and CA clevis mount.
Flap Folding
Drives carton side flaps during case erecting, utilizing the precise 70 mm stroke and adjustable end cushions.
Light Pressing
Applies consistent 0.5 MPa downward pressure for seating lightweight bearings or electrical connectors.
Replacing the Airtac SI40 Standard Cylinder SI40X70CA with the SAI40X70CA
To replace the SI40X70CA, order the SAI40X70CA and confirm the ISO 15552 CA clevis mounting, 40 mm bore, 70 mm stroke, and G1/4 port. This non-magnetic SKU cannot support sensors, unlike the CS1-B/DS1-B switches used on -S models. If sizing both ways, neighboring bores are 32 mm (402 N push @0.5 MPa) and 50 mm (982 N push @0.5 MPa). A plain cylinder does not hold load on air loss; the cushion only decelerates. For secure holding, use an external pilot check valve or explore the SAIL (air-released lock) and SAIF (built-in 4M valve) variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X70CA
- ✓ 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 SI40X70CA FAQ
Yes, the SI40X70CA is discontinued. The direct replacement is the SAI40X70CA. It shares the identical ISO 15552 mounting interface, 40 mm bore, 70 mm stroke, CA clevis, and G1/4 port, fitting directly into existing fixtures.
The 40 mm bore features a G1/4 port and M12x1.25 rod thread. It generates 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 SAI40X70CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X70CA replacement — usually within 7-8 hours.