This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X220S, 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 SI40X220S
The AirTAC Airtac SI40 Standard Cylinder SI40X220S 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 SAI40X220S, 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 → SAI40X220S
- 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 SI40X220S
The AirTAC SI40X220S 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 SAI40X220S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding, the SAI family introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X220S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X220S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X220S |
| 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 SAI40X220S 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 SAI40X220S 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 SI40X220S
| 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 SI40X220S Is Used
Package Diversion
Actuates routing gates on packaging lines where 628 N push force at 0.5 MPa easily redirects standard cartons.
Clamp Actuation
Secures medium workpieces during machining, providing 528 N pull force at 0.5 MPa for reliable hold-back.
Vertical Lift Stops
Controls stopping mechanisms in low-inertia vertical material handling, safely managing loads around 32 kg.
Replacing the Airtac SI40 Standard Cylinder SI40X220S with the SAI40X220S
To replace the SI40X220S, order the SAI40X220S ensuring the ISO 15552 mounting interface, 40 mm bore, 220 mm stroke, G1/4 port, and M12x1.25 rod thread match your fixture. Because this unit includes a magnet (-S), confirm your sensor choice; the legacy SI used CS1-B/DS1-B switches, while the SAI family uses current AirTAC sensors. When sizing, neighbouring bores offer different capacities: a 32 mm bore yields 402 N push at 0.5 MPa, whereas a 50 mm bore yields 982 N. For loads exceeding 377 N or vertical lifts over 32 kg, step up to the 50 mm bore. A plain cylinder does not hold load without live air; the cushion only decelerates. For holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 220 mm stroke, guide side loads to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X220S
- ✓ 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 SI40X220S FAQ
Yes, the SI40X220S is discontinued. The direct replacement is the SAI40X220S. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 220 mm stroke, output force, G1/4 port, and mounting accessories.
The 40 mm bore uses a G1/4 air port. 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 maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X220S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X220S replacement — usually within 7-8 hours.