This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX800, 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 SI40AX800
The AirTAC Airtac SI40 Standard Cylinder SI40AX800 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX800, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX800
- 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 SI40AX800
The AirTAC SI40AX800 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 800mm stroke. It delivers 628 N push and 528 N pull at 0.5 MPa through a G1/4 port. AirTAC replaced this EOL unit with the SAI40AX800, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, force and port.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -A suffix denotes a SUS420J2 stainless piston rod for corrosion resistance. Without a -S magnet, this SKU cannot take a sensor.
Airtac SI40 Standard Cylinder SI40AX800 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX800 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX800 |
| Bore size | Ø40 mm |
| Stroke | 800 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 SAI40AX800 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 SAI40AX800 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 SI40AX800
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×800 | 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 SI40AX800 Is Used
Long-Stroke Diversion
Drives 800mm pusher arms on packaging lines to reroute products, utilizing the 628 N push force at 0.5 MPa with external linear guides to prevent rod bending.
Pallet Handling
Moves lightweight pallets or totes over an 800mm distance where the SUS420J2 stainless rod offers needed corrosion resistance against ambient washdown moisture.
Replacing the Airtac SI40 Standard Cylinder SI40AX800 with the SAI40AX800
To replace the SI40AX800, order the SAI40AX800. Verify your ISO 15552 mounting fixture, 800mm stroke, G1/4 port, and SUS420J2 stainless rod requirement. Sizing both ways: a neighbouring 32mm bore yields 402 N push at 0.5 MPa, while a 50mm bore provides 982 N. This plain cylinder cannot hold a load without live air; the 27mm cushions only decelerate. For load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants. Because 800mm exceeds 300mm, prevent rod bending by guiding the load externally. This non-magnetic SKU cannot accept CS1-B/DS1-B switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX800
- ✓ 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 SI40AX800 FAQ
Yes, the SI40AX800 is discontinued. The direct replacement is the SAI40AX800. It shares the identical ISO 15552 mounting interface, 40mm bore, 800mm stroke, G1/4 port, and force ratings, fitting existing fixtures perfectly while upgrading the piston seal.
The 40mm bore features a G1/4 air port and a 16mm rod. It generates 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX800
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX800 replacement — usually within 7-8 hours.