This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX150S, 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 SI40AX150S
The AirTAC Airtac SI40 Standard Cylinder SI40AX150S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX150S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX150S
- 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 SI40AX150S
The AirTAC SI40AX150S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 150mm stroke, and an SUS420J2 stainless steel rod. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX150S, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40AX150S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX150S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX150S |
| Bore size | Ø40 mm |
| Stroke | 150 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 SAI40AX150S 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 SAI40AX150S 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 SI40AX150S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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 SI40AX150S Is Used
Stainless Rod Clamping
Ideal for securing workpieces in machining cells where the SUS420J2 rod resists coolant corrosion and the 628N force provides firm, repeatable clamping.
Package Diverting
Drives diverting arms on packaging lines. The 150mm stroke moves cartons cleanly between belts at speeds up to 800 mm/s.
Light Lift Gates
Actuates lightweight lifting flaps in material handling. The 32kg vertical lift capacity handles small component gating reliably.
Replacing the Airtac SI40 Standard Cylinder SI40AX150S with the SAI40AX150S
To replace the SI40AX150S, order the SAI40AX150S. Verify your ISO 15552 mounting fixture, 150mm stroke, G1/4 port, and the -S magnet for current AirTAC switches. Sizing context: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. This 40mm bore provides 628N push and 528N pull at 0.5MPa. Note that plain cylinders drift on air loss; cushions only decelerate. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant. The SUS420J2 rod offers corrosion resistance over standard carbon steel.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX150S
- ✓ 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 SI40AX150S FAQ
Yes, the SI40AX150S is discontinued. The direct replacement is the SAI40AX150S. It shares the identical ISO 15552 mounting interface, 40mm bore, 150mm stroke, G1/4 port, and force ratings, fitting directly into existing fixtures.
This 40mm bore cylinder uses a G1/4 port. At 0.5MPa it provides 628N push and 528N pull. At 0.7MPa push is 879N, and at 0.9MPa push is 1130N. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX150S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX150S replacement — usually within 7-8 hours.