This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX145S, 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 SI40AX145S
The AirTAC Airtac SI40 Standard Cylinder SI40AX145S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 145mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX145S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke145 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX145S
- 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 SI40AX145S
The AirTAC SI40AX145S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 145 mm stroke. It features a SUS420J2 stainless piston rod, a G1/4 air port, and delivers 628 N push force at 0.5 MPa. The direct replacement is the SAI40AX145S, matching the interface, bore, stroke, force, and port for immediate fixture compatibility.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, note that a standard cylinder drifts without live air; the cushion only decelerates. Use the SAIL or BSAI lock variants if needed. The -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40AX145S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX145S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX145S |
| Bore size | Ø40 mm |
| Stroke | 145 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 SAI40AX145S 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 SAI40AX145S 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 SI40AX145S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×145 | 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 SI40AX145S Is Used
Stainless Rod Actuation
Ideal for packaging machinery requiring the SUS420J2 stainless rod to resist moisture while providing 628 N push force at 0.5 MPa.
Mid-Stroke Diverting
The 145 mm stroke handles diverting or sorting tasks on a conveyor line, moving products smoothly with adjustable air cushions.
Replacing the Airtac SI40 Standard Cylinder SI40AX145S with the SAI40AX145S
To replace the SI40AX145S, order the SAI40AX145S. Verify the ISO 15552 mounting interface, 145 mm stroke, G1/4 port, and your mounting accessory. The -S magnet enables CS1-B/DS1-B switches, while the -A rod is SUS420J2 stainless. Sizing both ways: a 32 mm bore yields 402 N push at 0.5 MPa, whereas a 50 mm bore yields 982 N. At 0.7 MPa this 40 mm bore pushes 879 N. For this 145 mm stroke, ensure guide alignment to prevent rod bending. Remember, a plain cylinder does not hold load without air; use an external rod lock or pilot check valve for holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX145S
- ✓ 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 SI40AX145S FAQ
Yes, the SI40AX145S is discontinued. The direct replacement is the SAI40AX145S. It is a true ISO 15552 profile cylinder with the identical 40 mm bore, 145 mm stroke, G1/4 port, and mounting interface, fitting existing fixtures perfectly.
This 40 mm bore cylinder has a G1/4 air port, a 16 mm rod, and an M12x1.25 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 maximum theoretical force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX145S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX145S replacement — usually within 7-8 hours.