This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX135, 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 SI40AX135
The AirTAC Airtac SI40 Standard Cylinder SI40AX135 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 135mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX135, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke135 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX135
- 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 SI40AX135
The AirTAC SI40AX135 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 135mm stroke, and a SUS420J2 stainless piston rod. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the direct replacement SAI40AX135. This upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force, and port, but adds an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
Note this SKU lacks a magnet and cannot take a sensor. For high heat, Viton H seals raise the temperature limit to 150C. The standard air cushion only decelerates at stroke end; it does not hold load on air loss.
Airtac SI40 Standard Cylinder SI40AX135 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX135 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX135 |
| Bore size | Ø40 mm |
| Stroke | 135 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 SAI40AX135 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 SAI40AX135 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 SI40AX135
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×135 | 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 SI40AX135 Is Used
Stainless Rod Clamping
Uses the SUS420J2 rod to resist corrosion while clamping machined parts in humid production cells.
Package Diverting
Provides the 628N push force needed to divert light cartons at 30-800 mm/s on sorting lines.
Replacing the Airtac SI40 Standard Cylinder SI40AX135 with the SAI40AX135
To replace the SI40AX135, order the SAI40AX135. Confirm the ISO 15552 mounting interface, the 40mm bore, 135mm stroke, G1/4 port (PT/G/NPT), and your mounting accessory. This no-magnet SKU cannot accept a CS1-B or DS1-B switch; if sensing is needed, order an SAI with the -S magnet option. Sizing both ways: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. For load holding on air loss, the cushion is not a brake—use an external pilot check valve or the SAIL/BSAI lock variants. The 135mm stroke is under 300mm, so rod-bending side-load risks are minimal.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX135
- ✓ 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 SI40AX135 FAQ
Yes, the SI40AX135 is discontinued. The direct replacement is the SAI40AX135. It shares the same ISO 15552 mounting interface, 40mm bore, 135mm stroke, G1/4 port, and force, but features an upgraded piston seal for longer life.
The G1/4 port bore delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a 128kgf maximum at 1.0MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX135
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX135 replacement — usually within 7-8 hours.