This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX155, 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 SI40AX155
The AirTAC Airtac SI40 Standard Cylinder SI40AX155 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 155mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX155, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke155 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX155
- 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 SI40AX155
The AirTAC SI40AX155 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 155mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40AX155, which matches the exact interface, force, and mounting dimensions.
This SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -A suffix specifies a SUS420J2 stainless piston rod for corrosion resistance. Lacking a -S magnet, this SKU cannot take a sensor.
Airtac SI40 Standard Cylinder SI40AX155 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX155 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX155 |
| Bore size | Ø40 mm |
| Stroke | 155 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 SAI40AX155 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 SAI40AX155 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 SI40AX155
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×155 | 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 SI40AX155 Is Used
Clamping Mechanisms
Applies the 628N push force at 0.5MPa to secure mid-weight workpieces during machining operations.
Package Diverting
Uses the 155mm stroke to push parcels between adjacent conveyor lines without overshooting.
Replacing the Airtac SI40 Standard Cylinder SI40AX155 with the SAI40AX155
To replace the SI40AX155, order the SAI40AX155. Verify your ISO 15552 mounting fixture, 155mm stroke, and G1/4 port. Because this SKU lacks a -S magnet, it cannot accept position switches; if sensing is needed, order an SAI40A with the S suffix for CS1-B/DS1-B compatibility. For sizing, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. Note that a plain cylinder drifts without live air; for load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX155
- ✓ 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 SI40AX155 FAQ
Yes, the SI40AX155 is discontinued. The direct replacement is the SAI40AX155. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 155mm stroke, 628N force, G1/4 port, and SUS420J2 stainless rod.
It features a G1/4 air port. Theoretical forces are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum of 128kgf at 1.0MPa. The air cushion is 27mm at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX155
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX155 replacement — usually within 7-8 hours.