This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X610S, 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 SI40X610S
The AirTAC Airtac SI40 Standard Cylinder SI40X610S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 610mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X610S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke610 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X610S
- 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 SI40X610S
The AirTAC SI40X610S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 610 mm stroke. Delivering 628 N push force at 0.5 MPa, it features an extruded aluminum barrel, a G1/4 port, and a piston magnet for legacy CS1-B/DS1-B sensors. AirTAC replaced this EOL unit with the SAI40X610S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI replacement introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock or valve variants absent from the original SI line, while Viton H seals expand the temperature range to 150 C.
Airtac SI40 Standard Cylinder SI40X610S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X610S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X610S |
| Bore size | Ø40 mm |
| Stroke | 610 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 SAI40X610S 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 SAI40X610S 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 SI40X610S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×610 | 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 SI40X610S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with its 610 mm reach, relying on external guides to prevent rod bending during lateral extension.
Pneumatic Stop Gates
Acts as an extended-range stopper on accumulation conveyors, with the G1/4 port ensuring reliable flow for rapid cycling.
Replacing the Airtac SI40 Standard Cylinder SI40X610S with the SAI40X610S
To replace the SI40X610S, order the SAI40X610S and verify the ISO 15552 mounting interface, 40 mm bore, 610 mm stroke, G1/4 port, and your specific mounting accessory. Because this is a long 610 mm stroke, use an external guide to prevent rod bending and side-load damage. For sizing alternatives, neighboring bores (32 mm or 50 mm) offer different force classes, but at 0.5 MPa this 40 mm bore provides 628 N push and 528 N pull. Note that a plain cylinder drifts on air loss; the air cushion only decelerates the piston near stroke end. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X610S
- ✓ 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 SI40X610S FAQ
Yes, the SI40X610S is discontinued. The direct replacement is the SAI40X610S. It shares the same ISO 15552 mounting interface, 40 mm bore, 610 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly while upgrading the piston seal.
The 40 mm bore features a G1/4 air port and M12x1.25 rod thread. It delivers 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, and a theoretical maximum force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X610S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X610S replacement — usually within 7-8 hours.