This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX600, 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 SI40AX600
The AirTAC Airtac SI40 Standard Cylinder SI40AX600 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 600mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX600, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke600 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX600
- 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 SI40AX600
The AirTAC SI40AX600 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 600 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40AX600, matching the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU uses a SUS420J2 stainless rod (option A) but lacks a magnet, so it cannot accept a sensor.
Airtac SI40 Standard Cylinder SI40AX600 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX600 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX600 |
| Bore size | Ø40 mm |
| Stroke | 600 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 SAI40AX600 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 SAI40AX600 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 SI40AX600
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×600 | 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 SI40AX600 Is Used
Long-Stroke Diversion
Pushes packages across a 600 mm conveyor belt gap using the 628 N force output at 0.5 MPa.
Stainless Rod Ejection
Ejects machined parts in humid environments using the SUS420J2 corrosion-resistant rod.
Replacing the Airtac SI40 Standard Cylinder SI40AX600 with the SAI40AX600
To replace the SI40AX600, order the SAI40AX600. Verify your ISO 15552 mounting hardware (LB, FA, TC, etc.), the G1/4 air port, and the M12x1.25 rod thread. Because this 600 mm stroke is long, use an external guide to prevent rod bending and side-load damage. If you need load holding on air loss, note that the cushion only decelerates; you must add an external pilot check valve, a rod lock, or use the SAIL/BSAI lock variants. If sizing up or down, the adjacent 32 mm bore yields 402 N push, while the 50 mm bore yields 982 N push at 0.5 MPa.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX600
- ✓ 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 SI40AX600 FAQ
Yes, the SI40AX600 is discontinued. The direct replacement is the SAI40AX600. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 600 mm stroke, output force, G1/4 port, and mounting interface.
This double-acting cylinder uses a G1/4 port. It provides 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 theoretical max of 128 kgf at 1.0 MPa. It operates at 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX600
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX600 replacement — usually within 7-8 hours.