This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX170S, 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 SI40AX170S
The AirTAC Airtac SI40 Standard Cylinder SI40AX170S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 170mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX170S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke170 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX170S
- 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 SI40AX170S
The AirTAC SI40AX170S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 170mm stroke, and a SUS420J2 stainless piston rod. Delivering 628N push force at 0.5MPa, it is replaced by the SAI40AX170S. This direct upgrade shares the exact ISO 15552 mounting interface, G1/4 port, and 128kgf max force.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. The built-in magnet supports CS1-B/DS1-B sensors, while the SAI family adds SAIL and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40AX170S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX170S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX170S |
| Bore size | Ø40 mm |
| Stroke | 170 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 SAI40AX170S 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 SAI40AX170S 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 SI40AX170S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×170 | 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 SI40AX170S Is Used
Stainless Rod Clamping
The SUS420J2 rod resists moisture while providing 528N pull force to clamp parts in light machining cells.
Replacing the Airtac SI40 Standard Cylinder SI40AX170S with the SAI40AX170S
To replace the SI40AX170S, order the SAI40AX170S. Verify the ISO 15552 mounting interface, the G1/4 air port, and the M12x1.25 rod thread. Because this is a 170mm stroke, check side-load alignment to prevent rod bending. Sizing both ways: a 32mm bore yields 402N push @0.5MPa, while a 50mm bore yields 982N. Note that a plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The -S magnet works with legacy CS1-B/DS1-B switches; SAI uses current AirTAC switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX170S
- ✓ 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 SI40AX170S FAQ
Yes, the SI40AX170S is discontinued. The direct replacement is the SAI40AX170S, which shares the identical ISO 15552 mounting interface, 40mm bore, 170mm stroke, G1/4 port, and output force.
It features a G1/4 air port and provides 628N push / 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX170S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX170S replacement — usually within 7-8 hours.