This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X775S, 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 SI40X775S
The AirTAC Airtac SI40 Standard Cylinder SI40X775S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 775mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X775S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke775 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X775S
- 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 SI40X775S
The AirTAC SI40X775S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 775mm stroke. Delivering 628 N push force at 0.5 MPa, it features a G1/4 air port, M12x1.25 rod thread, and adjustable air cushions. The direct replacement is the SAI40X775S, matching the interface, bore, stroke, force, port and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked. This -S model has a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X775S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X775S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X775S |
| Bore size | Ø40 mm |
| Stroke | 775 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 SAI40X775S 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 SAI40X775S 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 SI40X775S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×775 | 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 SI40X775S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 775mm stroke, guided externally to prevent rod bending.
Pneumatic Pressing
Applies 628 N of clamping pressure for light assembly tasks, with adjustable cushions absorbing end-of-stroke impact.
Replacing the Airtac SI40 Standard Cylinder SI40X775S with the SAI40X775S
To replace the SI40X775S, order the SAI40X775S. Confirm the ISO 15552 mounting interface, 40mm bore, 775mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The -S denotes a magnet for CS1-B/DS1-B switches. For sizing, a 32mm bore yields 402 N push at 0.5 MPa, while a 50mm bore yields 982 N. Note that a 775mm stroke requires external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X775S
- ✓ 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 SI40X775S FAQ
Yes, the SI40X775S is discontinued. The direct replacement is the SAI40X775S. It is dimensionally interchangeable per ISO 15552, offering the same 40mm bore, 775mm stroke, 628 N force, G1/4 port, and mounting interface.
The G1/4 port bore delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, and 1130 N push at 0.9 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X775S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X775S replacement — usually within 7-8 hours.