This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX260, 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 SI40AX260
The AirTAC Airtac SI40 Standard Cylinder SI40AX260 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 SAI40AX260, 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 → SAI40AX260
- 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 SI40AX260
The AirTAC SI40AX260 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 260mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40AX260. This direct upgrade matches the exact interface, stroke, and force, fitting existing fixtures perfectly.
The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure and long life. This SKU uses a SUS420J2 stainless rod (option A) and lacks a magnet, so it cannot take a sensor. For high heat, Viton H seals raise the temperature limit to 150C.
Airtac SI40 Standard Cylinder SI40AX260 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX260 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX260 |
| 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 SAI40AX260 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 SAI40AX260 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 SI40AX260
| 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 SI40AX260 Is Used
Clamp Actuation
Provides reliable 628N clamping force for mid-sized machining fixtures, utilizing the SUS420J2 stainless rod to resist coolant corrosion.
Package Diversion
Drives 260mm stroke diverting arms on packaging lines, moving lightweight cartons without needing position sensors.
Gate Control
Operates access gates or sorting flaps in material handling hubs, safely managing loads around the 32kg vertical lift threshold.
Replacing the Airtac SI40 Standard Cylinder SI40AX260 with the SAI40AX260
To replace the SI40AX260, order the SAI40AX260. Confirm the ISO 15552 mounting interface, 40mm bore, 260mm stroke, G1/4 port (PT/G/NPT thread), and your specific mounting accessory. Because this SKU lacks a magnet (-S), it cannot accept position sensors like the legacy CS1-B/DS1-B. If you need to downsize, a 32mm bore yields 402N push at 0.5MPa; if upscaling, a 50mm bore provides 982N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding consider an external pilot check valve or the SAIL/BSAI lock variants. With a 260mm stroke, ensure adequate guide support to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX260
- ✓ 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 SI40AX260 FAQ
Yes, the SI40AX260 is discontinued. The direct replacement is the SAI40AX260. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 260mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port, a 16mm rod, and M12x1.25 threads. It delivers 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N at 0.9 MPa, and a maximum theoretical force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX260
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX260 replacement — usually within 7-8 hours.