This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX170S, 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 SI40BX170S
The AirTAC Airtac SI40 Standard Cylinder SI40BX170S 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 SAI40BX170S, 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 → SAI40BX170S
- 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 SI40BX170S
The AirTAC SI40BX170S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 170mm stroke, and a SUS304 stainless steel rod. Generating 628N push force at 0.5 MPa, it is replaced by the SAI40BX170S. This direct upgrade shares the exact ISO 15552 mounting interface, G1/4 port, and output force.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For this magnet-equipped model (-S), legacy CS1-B/DS1-B switches fit the sensor groove.
Airtac SI40 Standard Cylinder SI40BX170S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX170S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX170S |
| 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 SAI40BX170S 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 SAI40BX170S 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 SI40BX170S
| 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 SI40BX170S Is Used
Diverting Gate Actuation
Provides reliable 628N push force at 0.5 MPa to pivot diverter arms on packaging lines, with the SUS304 rod resisting washdown corrosion.
Stainless Clamping
Secures small aluminium or steel extrusions during machining, where the 40mm bore delivers firm 528N pull force without deforming parts.
Replacing the Airtac SI40 Standard Cylinder SI40BX170S with the SAI40BX170S
To replace the SI40BX170S, order the SAI40BX170S. Confirm the ISO 15552 mounting interface, the 170mm stroke, the G1/4 port, and your mounting accessory (LB, FA, TC, etc.). The -S magnet and -B SUS304 rod are retained. If sizing down, a 32mm bore yields 402N push at 0.5 MPa; sizing up to 50mm provides 982N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 170mm stroke, side-load is low, but ensure guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX170S
- ✓ 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 SI40BX170S FAQ
Yes, the AirTAC SI40BX170S is discontinued. The direct replacement is the SAI40BX170S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 170mm stroke, G1/4 port, and mounting fixtures.
It features a G1/4 air port and M12x1.25 rod thread. Force output is 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX170S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX170S replacement — usually within 7-8 hours.