This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX10S, 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 SI40AX10S
The AirTAC Airtac SI40 Standard Cylinder SI40AX10S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 10mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX10S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke10 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX10S
- 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 SI40AX10S
The AirTAC SI40AX10S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 10mm stroke, and a SUS420J2 stainless steel piston rod. It delivers 628 N of push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI40AX10S, a direct alternative retaining the exact same ISO 15552 mounting interface, bore, stroke, output force, and G1/4 port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, and the family expands to include SAIL, SAIF, and BSAI lock variants the original SI lacked.
Airtac SI40 Standard Cylinder SI40AX10S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX10S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX10S |
| Bore size | Ø40 mm |
| Stroke | 10 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 SAI40AX10S 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 SAI40AX10S 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 SI40AX10S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×10 | 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 SI40AX10S Is Used
Short-Stroke Clamping
Ideal for holding light metal or composite parts during machining, using the 10mm stroke to secure components firmly with 628 N of push force.
Stainless Rod Ejection
The SUS420J2 rod option provides corrosion resistance for ejecting parts in humid wash-down environments or exposing components to minor moisture.
Compact Gate Diverting
Fits into tight machinery envelopes to actuate small diverter gates or push lightweight product carriers along a conveyor line.
Replacing the Airtac SI40 Standard Cylinder SI40AX10S with the SAI40AX10S
To replace the SI40AX10S, order the SAI40AX10S by confirming the ISO 15552 interface, 40mm bore, 10mm stroke, G1/4 port, and mounting accessory. The -A denotes a SUS420J2 stainless rod, and -S denotes the magnet for CS1-B/DS1-B switches. If you need more force, the neighbouring 50mm bore yields 982 N push at 0.5 MPa; if less is required, the 32mm bore provides 402 N. Remember that a plain cylinder drifts without live air, as the cushion only decelerates. For load holding, explore the SAIL or BSAI lock variants, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX10S
- ✓ 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 SI40AX10S FAQ
Yes, the SI40AX10S is discontinued. The direct replacement is the SAI40AX10S. It shares the identical ISO 15552 mounting interface, 40mm bore, 10mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
This double-acting cylinder uses a G1/4 air port. 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 SAI40AX10S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX10S replacement — usually within 7-8 hours.