This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X220, 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 SI40X220
The AirTAC Airtac SI40 Standard Cylinder SI40X220 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 SAI40X220, 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 → SAI40X220
- 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 SI40X220
The AirTAC SI40X220 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. The direct replacement is the SAI40X220, matching the exact interface, bore, stroke, force, port and mounting.
Because this SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor. The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure.
Airtac SI40 Standard Cylinder SI40X220 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X220 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X220 |
| 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 SAI40X220 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 SAI40X220 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 SI40X220
| 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 SI40X220 Is Used
Package Diverting
Actuates routing gates on 40 mm belt conveyors, using the 628 N push force to deflect medium-weight cartons reliably at speed.
Pallet Stopping
Functions as a pneumatic stop gate in low-pressure roller lanes, holding standard Euro pallets securely during manual wrapping.
Clamp Actuation
Drives secondary clamping arms on light machining fixtures where 220 mm of travel is required to clear large workpieces.
Replacing the Airtac SI40 Standard Cylinder SI40X220 with the SAI40X220
To replace the SI40X220, order the SAI40X220 and confirm the ISO 15552 mounting interface, 220 mm stroke, G1/4 port (PT/G/NPT thread), and your mounting accessory (LB, FA, TC, etc.). This non-magnet SKU cannot hold a position sensor. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 220 mm stroke, rod bending is low, but always guide the load to prevent side-load wear. If more force is needed, the neighbouring 50 mm bore yields 982 N push at 0.5 MPa; if less is needed, the 32 mm bore yields 402 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X220
- ✓ 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 SI40X220 FAQ
Yes, the SI40X220 is discontinued. The direct replacement is the AirTAC SAI40X220. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 220 mm stroke, G1/4 port, and mounting fixtures perfectly.
The 40 mm bore uses a G1/4 air port. Theoretical forces are: 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 maximum force of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X220
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X220 replacement — usually within 7-8 hours.