This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX210, 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 SI40AX210
The AirTAC Airtac SI40 Standard Cylinder SI40AX210 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 210mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX210, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke210 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX210
- 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 SI40AX210
The AirTAC SI40AX210 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 210mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40AX210, matching the interface, bore, stroke, force, port and mounting. This SKU uses an SUS420J2 stainless piston rod for corrosion resistance but lacks a magnet, so it cannot take a sensor.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. If you need load holding on air loss, explore the SAIL or BSAI lock variants, as standard cushions only decelerate.
Airtac SI40 Standard Cylinder SI40AX210 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX210 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX210 |
| Bore size | Ø40 mm |
| Stroke | 210 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 SAI40AX210 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 SAI40AX210 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 SI40AX210
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×210 | 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 SI40AX210 Is Used
Package Diversion
Actuates routing gates on packaging lines where the 628N push force at 0.5MPa easily deflects standard cardboard cartons.
Corrosive Milling Clamp
Holds aluminum or wet machined parts using the SUS420J2 stainless rod, providing reliable 528N pull force in coolant environments.
Replacing the Airtac SI40 Standard Cylinder SI40AX210 with the SAI40AX210
To replace the SI40AX210, order the SAI40AX210. Confirm the ISO 15552 mounting interface, the 40mm bore, 210mm stroke, G1/4 port (PT/G/NPT thread options) and your specific mounting accessory. Because this SKU has no -S magnet, it cannot accept position sensors; if sensing is required, switch to an SAI40X210S equivalent. For sizing, the 40mm bore yields 628N push at 0.5MPa; dropping to a 32mm bore gives 402N, while a 50mm bore offers 982N. Since the 210mm stroke exceeds 300mm, ensure adequate guiding to prevent rod bending and side loads. For load holding without live air, use an external pilot check valve, rod lock, or the SAIL/BSAI variants, as cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX210
- ✓ 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 SI40AX210 FAQ
Yes, the SI40AX210 is discontinued. The direct replacement is the SAI40AX210. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 210mm stroke, 628N force, G1/4 port and mounting interface.
This 40mm bore cylinder features a G1/4 air port and provides 628N push / 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum theoretical force of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX210
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX210 replacement — usually within 7-8 hours.