This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X35SCA, 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 SI40X35SCA
The AirTAC Airtac SI40 Standard Cylinder SI40X35SCA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 35mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X35SCA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke35 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X35SCA
- 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 SI40X35SCA
The AirTAC SI40X35SCA is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 35mm stroke, and a CA clevis mount. Delivering 628N push force at 0.5MPa through a G1/4 port, it is replaced by the SAI40X35SCA. This direct successor matches the exact ISO 15552 mounting interface, bore, and output force.
The SAI upgrade utilizes a two Y-shaped one-way piston seal for low start-up pressure and extended life. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X35SCA Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X35SCA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X35SCA |
| Bore size | Ø40 mm |
| Stroke | 35 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 SAI40X35SCA 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 SAI40X35SCA 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 SI40X35SCA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×35 | 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 SI40X35SCA Is Used
Short-Stroke Clamping
Ideal for holding light machining fixtures with its 35mm stroke and 628N push force at 0.5MPa.
Package Diverting
Provides swift actuation for routing small to mid-size cartons along sorting lines at 30-800mm/s.
Part Ejection
Quickly pushes finished components out of press dies using the CA clevis mount to handle pivot stresses.
Replacing the Airtac SI40 Standard Cylinder SI40X35SCA with the SAI40X35SCA
To replace the SI40X35SCA, order the SAI40X35SCA. Confirm the ISO 15552 CA clevis mount, 40mm bore, 35mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B switches. If you need more force, the 50mm bore yields 982N push at 0.5MPa; if less is acceptable, the 32mm bore provides 402N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X35SCA
- ✓ 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 SI40X35SCA FAQ
Yes, the SI40X35SCA is discontinued. The direct replacement is the SAI40X35SCA, which shares the identical ISO 15552 mounting interface, 40mm bore, 35mm stroke, G1/4 port, and CA clevis.
It features a G1/4 port and provides 628N push / 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X35SCA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X35SCA replacement — usually within 7-8 hours.