This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X360S, 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 SI40X360S
The AirTAC Airtac SI40 Standard Cylinder SI40X360S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 360mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X360S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke360 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X360S
- 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 SI40X360S
The AirTAC SI40X360S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 360 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40X360S, which matches the exact ISO 15552 mounting interface, bore, stroke, force and port size for seamless fixture integration.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors; the SAI uses current AirTAC switches. The SAI family also adds SAIL, SAIF and BSAI lock variants.
Airtac SI40 Standard Cylinder SI40X360S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X360S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X360S |
| Bore size | Ø40 mm |
| Stroke | 360 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 SAI40X360S 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 SAI40X360S 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 SI40X360S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×360 | 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 SI40X360S Is Used
Package Diverting
Pushes light to medium cartons on a sorting line using the 628 N push force, with the 360 mm stroke reaching across a 400 mm belt.
Pallet Gate Actuation
Extends to open or close safety gates at palletizing stations, benefiting from the long 360 mm travel and smooth adjustable air cushions.
Component Transfer
Moves workpieces between machining stages, where the magnetic piston allows CS1-B/DS1-B sensors to confirm full extension.
Replacing the Airtac SI40 Standard Cylinder SI40X360S with the SAI40X360S
To replace the SI40X360S, order the SAI40X360S. Confirm the ISO 15552 interface, 40 mm bore, 360 mm stroke, G1/4 port (PT/G/NPT thread options) and your mounting accessory. The -S magnet is required for current AirTAC switches. For sizing, a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 360 mm, prevent rod bending by supporting the load with an external guide.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X360S
- ✓ 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 SI40X360S FAQ
Yes, the SI40X360S is discontinued. The direct replacement is the SAI40X360S. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 360 mm stroke, G1/4 port and mounting interface.
This double-acting cylinder has a G1/4 port. 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 SAI40X360S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X360S replacement — usually within 7-8 hours.