This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX140S, 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 SI40AX140S
The AirTAC Airtac SI40 Standard Cylinder SI40AX140S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 140mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX140S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke140 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX140S
- 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 SI40AX140S
The AirTAC SI40AX140S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 140mm stroke, and a G1/4 air port. Delivering 628 N push force at 0.5 MPa, it utilized a SUS420J2 stainless piston rod and an integrated magnet for CS1-B/DS1-B legacy sensors. AirTAC replaced this unit with the SAI40AX140S direct replacement.
The SAI40AX140S maintains identical ISO 15552 mounting-interface dimensions, bore, stroke, and force, but introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure.
Airtac SI40 Standard Cylinder SI40AX140S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX140S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX140S |
| Bore size | Ø40 mm |
| Stroke | 140 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 SAI40AX140S 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 SAI40AX140S 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 SI40AX140S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×140 | 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 SI40AX140S Is Used
Package Diversion
Ideal for pushing lightweight to medium cartons on packaging lines, utilizing the 628 N push force to actuate routing gates at high cycling speeds.
Clamp Actuation
Provides reliable clamping pressure for small machined components, where the 140mm stroke offers ample reach without exceeding standard length limits.
Replacing the Airtac SI40 Standard Cylinder SI40AX140S with the SAI40AX140S
To replace the SI40AX140S, order the SAI40AX140S direct cylinder. Verify your ISO 15552 mounting hardware (LB, FA, or TC), the 140mm stroke, G1/4 port, and the -S magnet requirement. The SAI family also adds SAIL, SAIF, and BSAI variants the SI lacked. If dropping to a 32mm bore halves your force, stepping up to a 50mm bore increases 0.5 MPa push force to 982 N. Note that a plain cylinder drifts on air loss; the air cushion only decelerates near stroke end. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX140S
- ✓ 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 SI40AX140S FAQ
Yes, the SI40AX140S is discontinued. The direct replacement is the SAI40AX140S. It shares the same ISO 15552 mounting interface, 40mm bore, 140mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
This 40mm bore cylinder features a G1/4 air port and an 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 maximum force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX140S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX140S replacement — usually within 7-8 hours.