This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X455S, 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 SI40X455S
The AirTAC Airtac SI40 Standard Cylinder SI40X455S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 455mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X455S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke455 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X455S
- 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 SI40X455S
The AirTAC SI40X455S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 455mm stroke. Delivering 628N push force at 0.5MPa, it is replaced by the SAI40X455S. This direct successor shares the exact interface, G1/4 port, and M12x1.25 rod thread. The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure.
The SAI family introduces variants the SI lacked, such as the SAIL lock, SAIF valve, and BSAI clamp-lock. The original SI-S uses CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. Rod material options include carbon steel, SUS420J2, and SUS304. Note that a plain cylinder drifts without live air; use SAIL or a pilot check valve for load holding. With a 455mm stroke, external guides are advised to prevent rod bending.
Airtac SI40 Standard Cylinder SI40X455S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X455S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X455S |
| Bore size | Ø40 mm |
| Stroke | 455 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 SAI40X455S 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 SAI40X455S 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 SI40X455S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×455 | 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 SI40X455S Is Used
Package Diversion
Drives sorting pop-up arms on packaging lines, utilizing the 628N push force and 455mm stroke to redirect cartons efficiently.
Component Ejection
Ejects machined parts from fixtures, relying on the 27mm adjustable air cushions to decelerate the rod smoothly at stroke ends.
Replacing the Airtac SI40 Standard Cylinder SI40X455S with the SAI40X455S
To replace the discontinued SI40X455S, order the SAI40X455S, ensuring a true ISO 15552 direct match for bore, stroke, G1/4 port, and mounting. The -S magnet enables position sensing; the SI used CS1-B/DS1-B switches, whereas the SAI takes current AirTAC sensors. If sizing down, a 32mm bore yields 402N push at 0.5MPa; sizing up to 50mm provides 982N. Because the 455mm stroke increases side-load risks, use external guides to prevent rod bending. A plain cylinder does not hold load on air loss—the cushion only decelerates. For secure holding, specify the SAIL lock variant, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X455S
- ✓ 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 SI40X455S FAQ
Yes, the SI40X455S is discontinued. The direct replacement is the SAI40X455S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 455mm stroke, 628N force, G1/4 port, and mounting fixtures.
At 0.5MPa, push force is 628N and pull is 528N. At 0.7MPa push is 879N, and at 0.9MPa it is 1130N. The theoretical max is 128kgf at 1.0MPa. Operating speed is 30-800mm/s, and the air port is G1/4.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X455S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X455S replacement — usually within 7-8 hours.