This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X260, 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 SI40X260
The AirTAC Airtac SI40 Standard Cylinder SI40X260 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 SAI40X260, 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 → SAI40X260
- 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 SI40X260
The AirTAC SI40X260 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 260mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X260, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, port size and accessories.
The SAI40X260 introduces an upgraded piston seal featuring two Y-shaped one-way elements for low start-up pressure and extended life. Note that this specific SI SKU lacks a magnet and cannot accept a sensor. The SAI family also adds SAIL, SAIF and BSAI lock variants the original SI line lacked.
Airtac SI40 Standard Cylinder SI40X260 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X260 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X260 |
| 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 SAI40X260 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 SAI40X260 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 SI40X260
| 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 SI40X260 Is Used
Package Diverting
Pushes cartons at 30-800mm/s on packaging lines where the 528N pull force easily handles light side-transfer duties.
Clamp Actuation
Secures medium workpieces during machining using the 628N push force at 0.5MPa, relying on the 27mm adjustable cushion for smooth end-of-stroke deceleration.
Replacing the Airtac SI40 Standard Cylinder SI40X260 with the SAI40X260
To replace the SI40X260, order the SAI40X260 and confirm your ISO 15552 mounting interface, 260mm stroke, G1/4 port (PT/G/NPT thread options) and M12x1.25 rod-end thread. Because this legacy SKU has no -S magnet, it cannot support a position switch; if sensing is needed, order an SAI40X260S. Sizing both ways: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. A plain cylinder does not hold load on air loss—the cushion only decelerates—so for holding use an external pilot check valve or the SAIL/BSAI lock variant. For the 260mm stroke, ensure guide support to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X260
- ✓ 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 SI40X260 FAQ
Yes, the AirTAC SI40X260 is discontinued. The direct replacement is the SAI40X260. It shares the identical ISO 15552 mounting interface, 40mm bore, 260mm stroke, force, G1/4 port and mounting accessories, fitting directly into existing fixtures.
The SI40X260 features a G1/4 air port. It delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa. Operating speed is 30-800mm/s.
Request a Quote for the SAI40X260
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X260 replacement — usually within 7-8 hours.