This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI160AX650S, 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 SI160 Standard Cylinder SI160AX650S
The AirTAC SI160 Standard Cylinder SI160AX650S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø160mm bore and 650mm stroke, G3/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI160AX650S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ160 mm
- Stroke650 mm
- Port sizeG3/4
- Acting typeDouble acting
- Rod threadM36×2.0
- StatusDiscontinued → SAI160AX650S
- 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 SI160 Standard Cylinder SI160AX650S
The AirTAC SI160AX650S is a discontinued double-acting ISO 15552 profile cylinder with a 160 mm bore and 650 mm stroke. It delivers a push force of 10053 N at 0.5 MPa and features a G3/4 port, an M36x2 rod thread, and a SUS420J2 stainless steel rod. AirTAC replaced this legacy unit with the SAI160AX650S, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade introduces an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, and the SAI family adds lock variants like the SAIL and BSAI that the SI line lacked.
Airtac SI160 Standard Cylinder SI160AX650S Technical Specifications
| Model | Airtac SI160 Standard Cylinder SI160AX650S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI160AX650S |
| Bore size | Ø160 mm |
| Stroke | 650 mm |
| Acting type | Double acting |
| Port size | G3/4 |
| Rod thread | M36×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 50 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI160AX650S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø160mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 10053 N | 9425 N |
| 0.7 MPa | 14074 N | — |
| Max (@1.0 MPa) | 2050 kgf | |
The SAI160AX650S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI160 Standard Cylinder SI160AX650S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 160 | Bore size in mm. |
| ×650 | 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 SI160 Standard Cylinder SI160AX650S Is Used
Heavy Machinery Forming
Drives large presses and forming fixtures where the 10053 N push force at 0.5 MPa easily handles substantial metal or composite workpieces.
Automated Welding Positioner
Moves large welding assemblies through the 650 mm travel range, relying on external guides to prevent rod bending under heavy weldments.
Replacing the Airtac SI160 Standard Cylinder SI160AX650S with the SAI160AX650S
To replace the SI160AX650S, order the SAI160AX650S. Confirm the ISO 15552 mounting interface, the 650 mm stroke, the G3/4 port (PT/G/NPT thread), and your mounting accessory. Because this is a long 650 mm stroke, use an external guide to prevent rod bending and side-load damage. Sizing both ways: if you need less force, the 125 mm bore offers 6136 N push at 0.5 MPa; if you need more, the 200 mm bore provides 15708 N. Note that a plain cylinder does not hold load without live air—the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants. The -S magnet works with CS1-B/DS1-B switches, while the SAI uses current AirTAC switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI160AX650S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI160 Standard Cylinder SI160AX650S FAQ
Yes, the SI160AX650S is discontinued. The direct replacement is the SAI160AX650S. It shares the same ISO 15552 mounting interface, 160 mm bore, 650 mm stroke, output force, and G3/4 port, so it fits existing fixtures perfectly.
This double-acting cylinder delivers a push force of 10053 N and a pull force of 9425 N at 0.5 MPa. At 0.7 MPa the push force is 14074 N, and at 0.9 MPa it is 18095 N. The theoretical maximum force is 2050 kgf at 1.0 MPa, with an operating speed of 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI160AX650S
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