This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X600S, 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 SI40X600S
The AirTAC Airtac SI40 Standard Cylinder SI40X600S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 600mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X600S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke600 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X600S
- 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 SI40X600S
The AirTAC SI40X600S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 600mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40X600S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force and accessories, fitting existing fixtures perfectly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. Your -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X600S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X600S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X600S |
| Bore size | Ø40 mm |
| Stroke | 600 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 SAI40X600S 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 SAI40X600S 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 SI40X600S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×600 | 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 SI40X600S Is Used
Long-Stroke Diversion
Pushes packages across a 600mm conveyor lane using the 628N @0.5MPa thrust, guided externally to prevent rod bending.
Component Ejection
Ejects machined parts from a fixture over a 600mm distance, relying on the adjustable 27mm air cushions for smooth end-of-stroke deceleration.
Replacing the Airtac SI40 Standard Cylinder SI40X600S with the SAI40X600S
To replace the SI40X600S, order the SAI40X600S and confirm the ISO 15552 mounting interface, 40mm bore, 600mm stroke, G1/4 port, and mounting accessory. The -S suffix means it has a piston magnet for CS1-B/DS1-B switches; the SAI uses current AirTAC switches. For sizing, a 50mm bore offers 982N push @0.5MPa, while a 32mm bore provides 402N. Remember, a plain cylinder drifts on air loss as the cushion only decelerates; use a SAIL lock variant or external pilot check valve for load holding. At 600mm stroke, prevent rod bending by using an external guide to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X600S
- ✓ 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 SI40X600S FAQ
Yes, the AirTAC SI40X600S is discontinued. The direct replacement is the SAI40X600S. It shares the same ISO 15552 mounting interface, 40mm bore, 600mm stroke, output force, G1/4 port and accessories, fitting your existing fixtures perfectly.
This double-acting 40mm bore cylinder has a G1/4 air port. It delivers 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. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X600S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X600S replacement — usually within 7-8 hours.