This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX170, 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 SI40AX170
The AirTAC Airtac SI40 Standard Cylinder SI40AX170 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 SAI40AX170, 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 → SAI40AX170
- 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 SI40AX170
The AirTAC SI40AX170 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 170 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX170, a direct upgrade retaining the exact same interface, output and mounting dimensions.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU uses a SUS420J2 stainless steel rod (the -A option) but lacks a magnet, meaning it cannot accept position sensors.
Airtac SI40 Standard Cylinder SI40AX170 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX170 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX170 |
| 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 SAI40AX170 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 SAI40AX170 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 SI40AX170
| 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 SI40AX170 Is Used
Clamp Actuation
Provides 628 N of push force at 0.5 MPa, ideal for securing mid-weight aluminum or steel workpieces during machining operations.
Package Diverting
Drives a 170 mm stroke diverting arm on sorting lines, moving cartons efficiently at operating speeds up to 800 mm/s.
Gate Lifting
Raises and lowers access gates or machine doors, with the SUS420J2 stainless rod offering corrosion resistance in humid environments.
Replacing the Airtac SI40 Standard Cylinder SI40AX170 with the SAI40AX170
To replace the SI40AX170, order the SAI40AX170. Confirm the ISO 15552 mounting interface, 40 mm bore, 170 mm stroke, G1/4 port (PT/G/NPT thread options) and your mounting accessory. This SKU has no magnet (-S), so it cannot support CS1-B/DS1-B sensors; choose an SAI40X170S if sensing is required. For load holding, note that a standard cylinder drifts on air loss—the cushion only decelerates. Use an external pilot check valve or explore the SAIL or BSAI lock variants. If sizing up or down, neighbouring bores are 32 mm (402 N) and 50 mm (982 N) at 0.5 MPa. At 170 mm stroke, side-load is minimal, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX170
- ✓ 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 SI40AX170 FAQ
Yes, the SI40AX170 is discontinued. The direct replacement is the SAI40AX170. It is dimensionally interchangeable per ISO 15552, keeping the same 40 mm bore, 170 mm stroke, 628 N force, G1/4 port and mounting fixtures.
This double-acting cylinder has a G1/4 air port. 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 maximum force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX170
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX170 replacement — usually within 7-8 hours.