This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X380S, 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 SI40X380S
The AirTAC Airtac SI40 Standard Cylinder SI40X380S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 380mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X380S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke380 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X380S
- 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 SI40X380S
The AirTAC SI40X380S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 380 mm stroke. Delivering 628 N push at 0.5 MPa through a G1/4 port, it is directly replaced by the SAI40X380S. This direct successor shares the exact ISO 15552 mounting interface, M12x1.25 rod thread and 27 mm cushions, fitting existing fixtures seamlessly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. Your -S suffix means a piston magnet for CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X380S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X380S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X380S |
| Bore size | Ø40 mm |
| Stroke | 380 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 SAI40X380S 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 SAI40X380S 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 SI40X380S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×380 | 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 SI40X380S Is Used
Package Diversion
Drives diverting arms on packaging lines, utilizing the 628 N push force to redirect cartons efficiently at high speeds.
Component Ejection
Ejects machined parts from fixtures with a 380 mm reach, requiring external guides to manage rod-bending over the long stroke.
Replacing the Airtac SI40 Standard Cylinder SI40X380S with the SAI40X380S
To replace the SI40X380S, order the SAI40X380S and confirm the ISO 15552 mounting, 40 mm bore, 380 mm stroke, G1/4 port (PT/G/NPT) and magnet. Sizing both ways: a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. Note that at 380 mm, side-load and rod-bending risks increase, so use an external guide to prevent premature 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 → SAI40X380S
- ✓ 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 SI40X380S FAQ
Yes, the SI40X380S is discontinued. The direct replacement is the SAI40X380S. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 380 mm stroke, force, G1/4 port and mounting accessories.
The bore is 40 mm with a G1/4 air port. Force output is 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 max of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X380S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X380S replacement — usually within 7-8 hours.