This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX220, 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 SI40AX220
The AirTAC Airtac SI40 Standard Cylinder SI40AX220 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 220mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX220, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke220 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX220
- 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 SI40AX220
The AirTAC SI40AX220 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 220 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX220. This current-production direct maintains the exact ISO 15552 mounting interface, bore, stroke, output force, and port size, fitting existing fixtures perfectly.
The SAI upgrade features a revised piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. This SI40AX220 variant uses a SUS420J2 stainless steel rod (A suffix) for corrosion resistance. As a no-magnet SKU, it cannot accept a sensor.
Airtac SI40 Standard Cylinder SI40AX220 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX220 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX220 |
| Bore size | Ø40 mm |
| Stroke | 220 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 SAI40AX220 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 SAI40AX220 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 SI40AX220
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×220 | 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 SI40AX220 Is Used
Stainless Rod Actuation
Ideal for packaging machinery where the SUS420J2 stainless piston rod resists moisture and corrosion during repeated clamping cycles.
Product Diverting
Provides reliable 628 N push force at 0.5 MPa to divert medium-weight cartons or containers on a 220 mm stroke line.
Fixture Positioning
Drops directly into existing ISO 15552 mounts to move tooling or gates in material handling systems without redesign.
Replacing the Airtac SI40 Standard Cylinder SI40AX220 with the SAI40AX220
To replace the discontinued SI40AX220, order the SAI40AX220. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the 220 mm stroke, the G1/4 port, and the SUS420J2 stainless rod option. Because this SKU lacks the -S magnet suffix, it cannot support position sensing; if switches are needed, specify an SAI40X220S. For loads near the 628 N @0.5 MPa rating, a 50 mm bore offers 982 N, while a 32 mm bore provides 402 N. At 220 mm stroke, ensure guide rails carry side loads to prevent rod bending. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or specify the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX220
- ✓ 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 SI40AX220 FAQ
Yes, the AirTAC SI40AX220 is discontinued. The direct replacement is the SAI40AX220. It is a true ISO 15552 profile cylinder sharing the identical 40 mm bore, 220 mm stroke, force, G1/4 port, and mounting interface, so it fits existing fixtures directly.
The G1/4 port feeds a 16 mm rod. Force output is 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, with a theoretical max of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX220
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX220 replacement — usually within 7-8 hours.