This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X765S, 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 SI40X765S
The AirTAC Airtac SI40 Standard Cylinder SI40X765S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 765mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X765S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke765 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X765S
- 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 SI40X765S
The AirTAC SI40X765S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 765mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40X765S. This direct successor matches the interface, bore, stroke, force and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The SAI family adds SAIL lock, SAIF valve and BSAI clamp variants. The -S magnet works with CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X765S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X765S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X765S |
| Bore size | Ø40 mm |
| Stroke | 765 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 SAI40X765S 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 SAI40X765S 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 SI40X765S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×765 | 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 SI40X765S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with its 765mm reach, utilizing the 628N push force at 0.5MPa to overcome friction on rollers.
Pallet Push-Off
Acts as a horizontal ejector for lightweight pallets, requiring external guides to prevent rod bending over the extended length.
Material Lowering
Lowers components down processing chutes, where the 528N pull force at 0.5MPa safely manages the descent of 32kg loads.
Replacing the Airtac SI40 Standard Cylinder SI40X765S with the SAI40X765S
To replace the SI40X765S, order the SAI40X765S direct: it matches the ISO 15552 mounting interface, 40mm bore, 765mm stroke, G1/4 port and -S magnet. If you need more force, the 50mm bore yields 982N push at 0.5MPa; if less is needed, the 32mm bore gives 402N. Because stroke is 765mm, prevent rod bending by using an external guide to absorb side loads. A plain cylinder drifts without air; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X765S
- ✓ 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 SI40X765S FAQ
Yes, the SI40X765S is discontinued. The direct replacement is the SAI40X765S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 765mm stroke, G1/4 port and mounting fixtures.
It features a G1/4 port and provides 628N push / 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X765S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X765S replacement — usually within 7-8 hours.