This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1600, 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 SI40X1600
The AirTAC Airtac SI40 Standard Cylinder SI40X1600 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1600mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1600, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1600 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1600
- 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 SI40X1600
The AirTAC SI40X1600 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 1600mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. Because 1600mm exceeds the 1200mm standard maximum for this bore, this unit is a non-standard, made-to-order configuration requiring external guides to prevent rod bending over such a long distance.
AirTAC replaced the SI line with the SAI family. The SAI40X1600 is the direct replacement, matching the ISO 15552 mounting interface, bore, output force, and port size. The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note this SKU lacks a magnet and cannot accept a CS1-B/DS1-B sensor.
Airtac SI40 Standard Cylinder SI40X1600 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1600 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1600 |
| Bore size | Ø40 mm |
| Stroke | 1600 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 SAI40X1600 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 SAI40X1600 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 SI40X1600
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1600 | 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 SI40X1600 Is Used
Long-Stroke Material Transfer
Pushes workpieces between machining stations over extended distances, utilizing the full 1600mm travel while requiring external guide rails to support the extended rod.
Vertical Lowering Mechanism
Lowers light fixtures or materials up to 32kg, relying on a pilot-operated check valve to hold the load safely since the standard cushion only decelerates at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40X1600 with the SAI40X1600
To replace the discontinued SI40X1600, order the SAI40X1600. Confirm your ISO 15552 mounting fixtures (LB, FA, TC, etc.), the G1/4 air port, and the M12x1.25 rod thread. Since this 1600mm stroke exceeds the 1200mm standard maximum, it is non-standard and demands external guide rails to prevent side-load and rod-bending issues. For sizing, a 50mm bore offers more thrust (982N push at 0.5MPa), while a 32mm bore offers less (402N). A plain cylinder drifts on air loss—the cushion only decelerates near stroke end—so for load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants. The SAIF variant adds a built-in valve if needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1600
- ✓ 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 SI40X1600 FAQ
Yes, the SI40X1600 is discontinued. The direct replacement is the SAI40X1600. It shares the same ISO 15552 mounting interface, 40mm bore, 1600mm stroke, output force, and G1/4 port, fitting directly into existing fixtures.
The G1/4 port supplies a 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. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1600
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1600 replacement — usually within 7-8 hours.