This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX220S, 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 SI40BX220S
The AirTAC Airtac SI40 Standard Cylinder SI40BX220S 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 SAI40BX220S, 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 → SAI40BX220S
- 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 SI40BX220S
The AirTAC SI40BX220S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 220mm stroke, and a SUS304 stainless steel rod. Delivering 628N push force at 0.5MPa, it is directly replaced by the SAI40BX220S. This direct upgrade shares the exact same ISO 15552 mounting interface, G1/4 port, and M12x1.25 rod thread, fitting existing fixtures perfectly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40BX220S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX220S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX220S |
| 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 SAI40BX220S 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 SAI40BX220S 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 SI40BX220S
| 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 SI40BX220S Is Used
Stainless Rod Actuation
Ideal for packaging or light processing machinery requiring the corrosion resistance of the SUS304 piston rod alongside 628N push force.
220mm Stroke Diverting
Provides the exact 220mm travel needed to actuate diverters or gates on medium-duty material handling conveyors.
Replacing the Airtac SI40 Standard Cylinder SI40BX220S with the SAI40BX220S
To replace the SI40BX220S, order the SAI40BX220S. Confirm the ISO 15552 mounting interface, the 220mm stroke, the G1/4 port, and your specific mounting accessory (LB, FA, TC, etc.). The -B rod is SUS304 stainless steel, and the -S magnet supports legacy CS1-B/DS1-B sensors. For sizing both ways: if you need more force, the 50mm bore offers 982N push at 0.5MPa; if you need less, the 32mm bore provides 402N. Note that a plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. Since the 220mm stroke is over 300mm? No, but for any stroke over 300mm, add a guide to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX220S
- ✓ 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 SI40BX220S FAQ
Yes, the SI40BX220S is discontinued. The direct replacement is the SAI40BX220S. It shares the same ISO 15552 mounting interface, 40mm bore, 220mm stroke, G1/4 port, and output force, fitting directly into existing fixtures.
The bore is 40mm with a G1/4 air port. The thrust is 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. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX220S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX220S replacement — usually within 7-8 hours.