This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX120, 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 SI40AX120
The AirTAC SI40 Standard Cylinder SI40AX120 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 120mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX120, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX120
- 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 SI40AX120
The AirTAC SI40AX120 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 120mm stroke. It delivers 628N push force at 0.5MPa. The direct replacement is the SAI40AX120, sharing the same interface, port and output. This SKU features a SUS420J2 stainless rod and lacks a magnet, so it cannot accept a sensor.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure. The family also adds SAIL and BSAI lock variants absent from the legacy line.
Airtac SI40 Standard Cylinder SI40AX120 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX120 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX120 |
| Bore size | Ø40 mm |
| Stroke | 120 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 SAI40AX120 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 SAI40AX120 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 SI40AX120
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×120 | 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 SI40AX120 Is Used
Compact Clamping
Secures mid-weight machined parts in CNC fixtures using the 628N push force at 0.5MPa.
Package Diverting
Actuates sorting gates on packaging lines where a 120mm stroke and SUS420J2 rod resist moisture.
Replacing the Airtac SI40 Standard Cylinder SI40AX120 with the SAI40AX120
To replace the SI40AX120, order the SAI40AX120. Verify the ISO 15552 mounting interface, the G1/4 port, and your specific mounting accessory. Because this SKU has no magnet, it cannot support sensing; if position detection is needed, switch to an SAI model with an S suffix. For sizing, the 32mm bore yields 402N push at 0.5MPa, while the 50mm bore yields 982N. Note that a plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX120
- ✓ 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 SI40AX120 FAQ
Yes, the SI40AX120 is discontinued. The direct replacement is the SAI40AX120. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 120mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 port. It provides 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX120
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX120 replacement — usually within 7-8 hours.