This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X170S, 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 SI40X170S
The AirTAC Airtac SI40 Standard Cylinder SI40X170S 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 SAI40X170S, 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 → SAI40X170S
- 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 SI40X170S
The AirTAC SI40X170S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 170mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X170S, matching the exact interface, bore, stroke, force and mounting.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI variants the SI lacked. The -S suffix means it has a piston magnet for CS1-B/DS1-B switches.
Airtac SI40 Standard Cylinder SI40X170S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X170S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X170S |
| 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 SAI40X170S 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 SAI40X170S 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 SI40X170S
| 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 SI40X170S Is Used
Package Diversion
Ideal for pushing light to medium cartons on a conveyor line with its 628N push force and 170mm stroke.
Small Part Ejection
Provides reliable ejection of machined components from a fixture using the 32kg safe vertical lift capacity.
Pallet Stop Gate
Acts as a pneumatic stop gate for low-profile pallets, utilising the ISO 15552 mounting for easy fixture integration.
Replacing the Airtac SI40 Standard Cylinder SI40X170S with the SAI40X170S
To replace the SI40X170S, order the SAI40X170S. Confirm the ISO 15552 mounting interface, 40mm bore, 170mm stroke, G1/4 port (PT/G/NPT thread options) and your mounting accessory. The -S magnet allows CS1-B/DS1-B sensors, though the SAI uses current AirTAC switches. For sizing, the neighbouring 32mm bore yields 402N push at 0.5MPa, while the 50mm bore yields 982N. A plain cylinder drifts on air loss as the cushion only decelerates; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X170S
- ✓ 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 SI40X170S FAQ
Yes, the AirTAC SI40X170S is discontinued. The direct replacement is the SAI40X170S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 170mm stroke, 628N force, G1/4 port and mounting interface.
It is a double-acting cylinder with a 16mm rod, M12x1.25 thread, 27mm cushion and G1/4 port. Speed is 30-800 mm/s. Force ratings are: 628N push and 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 SAI40X170S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X170S replacement — usually within 7-8 hours.