This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X260S, 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 SI40X260S
The AirTAC Airtac SI40 Standard Cylinder SI40X260S 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 SAI40X260S, 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 → SAI40X260S
- 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 SI40X260S
The AirTAC SI40X260S 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 SAI40X260S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force, port and accessories, fitting existing fixtures perfectly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants. This SI-SKU includes a magnet for legacy CS1-B/DS1-B sensors, while SAI uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X260S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X260S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X260S |
| 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 SAI40X260S 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 SAI40X260S 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 SI40X260S
| 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 SI40X260S Is Used
Package Diversion
Pushes medium-weight cartons across transfer belts using the 628N push force at 0.5MPa, with the 260mm stroke clearing adjacent lanes.
Clamp Actuation
Secures aluminium extrusions for machining operations, providing reliable 528N pull force and deceleration via the 27mm adjustable air cushions.
Pallet Positioning
Indexes empty pallets into a wrapping station, where the 40mm bore and G1/4 port deliver rapid 30-800mm/s cycling.
Replacing the Airtac SI40 Standard Cylinder SI40X260S with the SAI40X260S
To replace the SI40X260S, order the SAI40X260S. Verify the ISO 15552 mounting interface, 40mm bore, 260mm stroke, G1/4 port (PT/G/NPT thread) and mounting accessory. The -S magnet equates to SAI-S, switching from legacy CS1-B/DS1-B to current AirTAC switches. Sizing both ways: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. At 260mm stroke, use guide rails to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X260S
- ✓ 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 SI40X260S FAQ
Yes, the AirTAC SI40X260S is discontinued. The direct replacement is the SAI40X260S. It shares the same ISO 15552 mounting interface, 40mm bore, 260mm stroke, output force, G1/4 port and mounting accessories, fitting directly into existing fixtures.
This 40mm bore cylinder features a G1/4 air port and M12x1.25 rod thread. Theoretical forces are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum of 128kgf at 1.0MPa. It operates at 30-800mm/s with a 27mm adjustable cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X260S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X260S replacement — usually within 7-8 hours.