This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX400S, 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 SI40AX400S
The AirTAC Airtac SI40 Standard Cylinder SI40AX400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX400S
- 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 SI40AX400S
The AirTAC SI40AX400S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 400mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX400S, a direct sharing the exact ISO 15552 mounting interface, stroke, force, and accessories.
The SAI upgrade features a modernized piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. This SI40AX400S variant has a SUS420J2 stainless rod (-A) and a piston magnet (-S) for CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40AX400S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX400S |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAI40AX400S 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 SAI40AX400S 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 SI40AX400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SI40AX400S Is Used
Package Diverting
Pushes parcels between sorting lanes using the 628N force and 400mm reach, with the -S magnet confirming stroke endpoints.
Vertical Lifting
Hoists components up to 32kg against gravity, relying on the SUS420J2 stainless rod for corrosion resistance in damp settings.
Material Ejection
Ejects machined parts from a fixture over a 400mm distance, requiring external guides to absorb side-load impacts.
Replacing the Airtac SI40 Standard Cylinder SI40AX400S with the SAI40AX400S
To replace the SI40AX400S, order the SAI40AX400S. Verify your ISO 15552 mounting fixtures, the G1/4 air port, M12x1.25 rod thread, and the -S magnet for position sensing. If you need more force, the 50mm bore yields 982N push at 0.5MPa; if less is required, the 32mm bore offers 402N. Because this is a 400mm stroke, use an external guide to prevent rod bending and side-load damage. A standard cylinder drifts without air; for load holding, use an external pilot check valve or explore the SAIL lock or BSAI clamp-lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX400S
- ✓ 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 SI40AX400S FAQ
Yes, the SI40AX400S is discontinued. The direct replacement is the SAI40AX400S. It shares the identical ISO 15552 mounting interface, 40mm bore, 400mm stroke, force, and G1/4 port, fitting directly into your existing fixtures.
This 40mm bore cylinder uses a G1/4 air port. It generates 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa. The adjustable air cushion is 27mm at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX400S replacement — usually within 7-8 hours.