This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X10S, 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 SI40X10S
The AirTAC SI40 Standard Cylinder SI40X10S 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 SAI40X10S, 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 → SAI40X10S
- 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 SI40X10S
The AirTAC SI40X10S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 10 mm stroke. Delivering 628 N push force at 0.5 MPa, it features a G1/4 port and a built-in piston magnet for CS1-B/DS1-B switches. AirTAC replaced this legacy unit with the SAI40X10S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, port and accessories.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X10S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X10S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X10S |
| 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 SAI40X10S 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 SAI40X10S 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 SI40X10S
| 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 SI40X10S Is Used
Short-Stroke Clamping
Ideal for holding light workpieces in machining fixtures where a 10 mm travel and 628 N force securely position parts without bulk.
Ejector Mechanism
Provides a rapid 30-800 mm/s ejection punch in automated assembly lines, using the 528 N pull force to retract the pin quickly.
Diverting Gate Actuation
Drives small pneumatic flaps or routing gates in packaging conveyors, where the compact 40 mm bore fits tight machine envelopes.
Replacing the Airtac SI40 Standard Cylinder SI40X10S with the SAI40X10S
To replace the SI40X10S, order the SAI40X10S and confirm the ISO 15552 mounting interface, 40 mm bore, 10 mm stroke, G1/4 port and magnet (-S). The 10 mm stroke is nonstandard, so verify rod-end thread M12x1.25 and cushion 27 mm dimensions against your fixture. Sizing both ways: a 32 mm bore yields 402 N push, while a 50 mm bore yields 982 N at 0.5 MPa. Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X10S
- ✓ 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 SI40X10S FAQ
Yes, the AirTAC SI40X10S is discontinued. The direct replacement is the SAI40X10S. It shares the same ISO 15552 mounting interface, 40 mm bore, 10 mm stroke, force, G1/4 port and mounting accessories, fitting directly into existing fixtures.
The 40 mm bore provides 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s, with a G1/4 port and 27 mm adjustable air cushions.
Request a Quote for the SAI40X10S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X10S replacement — usually within 7-8 hours.