This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX260S, 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 SI40AX260S
The AirTAC Airtac SI40 Standard Cylinder SI40AX260S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 260mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX260S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke260 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX260S
- 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 SI40AX260S
The AirTAC SI40AX260S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 260mm stroke, and a SUS420J2 stainless steel rod. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40AX260S, matching the interface, bore, stroke, force, and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40AX260S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX260S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX260S |
| Bore size | Ø40 mm |
| Stroke | 260 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 SAI40AX260S 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 SAI40AX260S 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 SI40AX260S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×260 | 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 SI40AX260S Is Used
Diverting Gate Actuation
Provides reliable 628N push force at 0.5MPa to pivot heavy conveyor sorting gates handling packaged goods in distribution centers.
Stainless Rod Clamping
The SUS420J2 rod option excels in mildly corrosive parts clamping applications, securing machined components during secondary milling operations.
Replacing the Airtac SI40 Standard Cylinder SI40AX260S with the SAI40AX260S
To replace the SI40AX260S, order the SAI40AX260S. Confirm the ISO 15552 mounting interface, 40mm bore, 260mm stroke, G1/4 port (PT/G/NPT thread), and mounting accessory. The -A suffix denotes the SUS420J2 stainless rod, and -S indicates the piston magnet for CS1-B/DS1-B switches. For sizing, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 260mm stroke, ensure guide alignment to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX260S
- ✓ 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 SI40AX260S FAQ
Yes, the SI40AX260S is discontinued. The direct replacement is the SAI40AX260S. It features the same ISO 15552 mounting interface, 40mm bore, 260mm stroke, output force, G1/4 port, and SUS420J2 stainless rod, fitting existing fixtures perfectly.
This double-acting cylinder uses a G1/4 air port. It generates 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum force of 128kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX260S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX260S replacement — usually within 7-8 hours.