This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X323S, 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 SI40X323S
The AirTAC Airtac SI40 Standard Cylinder SI40X323S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 323mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X323S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke323 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X323S
- 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 SI40X323S
The AirTAC SI40X323S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 323mm stroke, and a G1/4 port. Generating 628N push force at 0.5MPa, it is directly replaced by the SAI40X323S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, and output force, fitting existing fixtures perfectly.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The -S suffix indicates a piston magnet for CS1-B/DS1-B legacy sensors, while the SAI family expands options with SAIL, SAIF, and BSAI variants.
Airtac SI40 Standard Cylinder SI40X323S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X323S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X323S |
| Bore size | Ø40 mm |
| Stroke | 323 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 SAI40X323S 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 SAI40X323S 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 SI40X323S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×323 | 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 SI40X323S Is Used
Package Diverting
Drives diverter arms on sorting lines, utilizing the 323mm stroke to push cartons between adjacent belt lanes smoothly.
Pallet Stopper Gate
Acts as a pneumatic stop for pallets at wrapping stations, providing reliable resistance with 628N of push force at 0.5MPa.
Component Ejection
Ejects machined parts from a fixture, where the 40mm bore provides sufficient thrust without damaging the product surface.
Replacing the Airtac SI40 Standard Cylinder SI40X323S with the SAI40X323S
To replace the SI40X323S, order the SAI40X323S, confirming the ISO 15552 mounting interface, 40mm bore, 323mm stroke, G1/4 port, and your specific mounting accessory. The -S magnet is required for CS1-B/DS1-B switches. If sizing up, the 50mm bore yields 982N push at 0.5MPa; if sizing down, the 32mm bore provides 402N. Because this is a 323mm stroke, prevent rod bending by using external guides to manage side loads. A plain cylinder will not hold a load without air; the cushion only decelerates. For secure holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X323S
- ✓ 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 SI40X323S FAQ
Yes, the SI40X323S is discontinued. The direct replacement is the SAI40X323S. It shares the same ISO 15552 mounting interface, 40mm bore, 323mm stroke, output force, and G1/4 port, fitting directly into your existing fixtures.
This double-acting cylinder features a G1/4 port and generates 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. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X323S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X323S replacement — usually within 7-8 hours.