This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X206, 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 SI40X206
The AirTAC Airtac SI40 Standard Cylinder SI40X206 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 206mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X206, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke206 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X206
- 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 SI40X206
The AirTAC SI40X206 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 206mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X206, matching the interface, bore, stroke, force and mounting exactly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This no-magnet SKU cannot take a sensor. For high heat, Viton H seals raise the limit to 150C.
Airtac SI40 Standard Cylinder SI40X206 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X206 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X206 |
| Bore size | Ø40 mm |
| Stroke | 206 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 SAI40X206 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 SAI40X206 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 SI40X206
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×206 | 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 SI40X206 Is Used
Component Clamping
Secures mid-weight machined parts during milling with 628N push force at 0.5 MPa.
Package Diverting
Actuates routing gates on 40mm bore assembly lines, cycling safely at 30-800 mm/s.
Vertical Lifting
Raises compact tote boxes, handling a safe vertical lift load of about 32 kg.
Replacing the Airtac SI40 Standard Cylinder SI40X206 with the SAI40X206
To replace the SI40X206, order the SAI40X206 direct: verify the ISO 15552 mounting, G1/4 port, M12x1.25 rod thread and 206mm stroke. Because this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B switches. If sizing up or down, adjacent bores are 32mm (402N) and 50mm (982N) at 0.5MPa. For 206mm strokes, ensure guide alignment to prevent rod bending. The air cushion only decelerates; it does not hold load. For drop prevention on air loss, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X206
- ✓ 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 SI40X206 FAQ
Yes, the SI40X206 is discontinued. The direct replacement is the SAI40X206. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 206mm stroke, output force, G1/4 port and mounting fixtures.
The G1/4 port feeds a 16mm rod. Force ratings are: 628N push and 528N pull at 0.5 MPa; 879N push at 0.7 MPa; 1130N push at 0.9 MPa; with a theoretical max of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X206
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X206 replacement — usually within 7-8 hours.