This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX140, 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 SI40AX140
The AirTAC Airtac SI40 Standard Cylinder SI40AX140 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 SAI40AX140, 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 → SAI40AX140
- 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 SI40AX140
The AirTAC SI40AX140 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 140mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40AX140, matching the interface, bore, stroke, force, and port.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU has a SUS420J2 stainless rod (A) but lacks a magnet, so it cannot take a sensor.
Airtac SI40 Standard Cylinder SI40AX140 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX140 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX140 |
| 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 SAI40AX140 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 SAI40AX140 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 SI40AX140
| 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 SI40AX140 Is Used
Compact Clamping
Secures mid-weight machined parts in CNC fixtures using the 628N push force, with the SUS420J2 rod resisting coolant splashes.
Package Diverting
Actuates routing gates on packaging lines where a 140mm stroke and 32kg vertical lift capacity easily move standard totes.
Replacing the Airtac SI40 Standard Cylinder SI40AX140 with the SAI40AX140
To replace the SI40AX140, order the SAI40AX140. Confirm the ISO 15552 mounting interface, 140mm stroke, G1/4 port (PT/G/NPT thread), and your specific mounting accessory. This non-magnetic SKU cannot accept a CS1-B/DS1-B sensor; if sensing is needed, order an SAI with the -S magnet suffix. The SUS420J2 stainless rod offers corrosion resistance over standard carbon steel. For sizing, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant. At 140mm stroke, side-load is minimal, but always guide the load to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX140
- ✓ 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 SI40AX140 FAQ
Yes, the SI40AX140 is discontinued. The direct replacement is the SAI40AX140. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 140mm stroke, 628N force, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port. It delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX140
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX140 replacement — usually within 7-8 hours.