This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X485S, 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 SI40X485S
The AirTAC Airtac SI40 Standard Cylinder SI40X485S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 485mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X485S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke485 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X485S
- 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 SI40X485S
The AirTAC SI40X485S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 485mm stroke. Delivering 628N push force at 0.5MPa, it is superseded by the SAI40X485S direct replacement. The SAI retains the exact G1/4 port, M12x1.25 thread, and mounting interface, 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 SI-S magnet works with legacy CS1-B/DS1-B switches, while the SAI family adds SAIL lock, SAIF valve, and BSAI clamp-lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X485S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X485S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X485S |
| Bore size | Ø40 mm |
| Stroke | 485 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 SAI40X485S 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 SAI40X485S 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 SI40X485S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×485 | 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 SI40X485S Is Used
Package Diverting
Drives diverting arms on packaging lines where the 628N push force at 0.5MPa easily shifts medium-weight cartons across conveyor belts.
Component Ejection
Ejects machined parts from fixtures, relying on the 27mm adjustable air cushions to decelerate the rod smoothly at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40X485S with the SAI40X485S
To replace the SI40X485S, order the SAI40X485S keeping the identical 40mm bore, 485mm stroke, G1/4 port, and ISO 15552 mounting. Verify your thread (PT/G/NPT) and accessory type (LB, FA, TC). The -S magnet supports CS1-B/DS1-B sensors. If you need more force, the 50mm bore offers 982N push at 0.5MPa; if less is required, the 32mm bore provides 402N. Because this is a 485mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding consider the SAIL lock variant, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X485S
- ✓ 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 SI40X485S FAQ
Yes, the SI40X485S is discontinued. The direct replacement is the SAI40X485S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 485mm stroke, G1/4 port, and mounting interface. The SAI simply upgrades the piston seal for lower start-up pressure.
The 40mm bore features a G1/4 air port and a 16mm rod. It generates 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X485S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X485S replacement — usually within 7-8 hours.