This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI160X685S, 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 SI160X685S
The AirTAC SI160 Standard Cylinder SI160X685S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø160mm bore and 685mm stroke, G3/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI160X685S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ160 mm
- Stroke685 mm
- Port sizeG3/4
- Acting typeDouble acting
- Rod threadM36×2.0
- StatusDiscontinued → SAI160X685S
- 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 SI160X685S
The AirTAC SI160X685S is a discontinued double-acting ISO 15552 profile cylinder with a 160 mm bore and 685 mm stroke. It delivers a thrust of 10053 N at 0.5 MPa via a G3/4 port. AirTAC replaced this legacy unit with the SAI160X685S, a direct alternative retaining the exact ISO 15552 mounting interface, bore, stroke, force and port size.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF and BSAI lock variants absent in the SI line. This -S model has a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI160 Standard Cylinder SI160X685S Technical Specifications
| Model | Airtac SI160 Standard Cylinder SI160X685S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI160X685S |
| Bore size | Ø160 mm |
| Stroke | 685 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 SAI160X685S 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 SAI160X685S 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 SI160X685S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 160 | Bore size in mm. |
| ×685 | 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 SI160X685S Is Used
Heavy Machinery Forming
Drives large presses and forming fixtures requiring 10053 N thrust at 0.5 MPa with stable 160 mm bore actuation.
Pallet Diversion
Shifts heavy loaded pallets along assembly lines, utilizing the 685 mm stroke to clear adjacent work zones.
Replacing the Airtac SI160 Standard Cylinder SI160X685S with the SAI160X685S
To replace the SI160X685S, order the SAI160X685S. Confirm the ISO 15552 mounting accessory (LB, FA, CA, TC), the G3/4 port thread (PT, G or NPT), and the -S magnet for current AirTAC switches. Sizing down, a 125 mm bore yields 6136 N push at 0.5 MPa; sizing up, a 200 mm bore provides 15708 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, specify the SAIL or BSAI lock variant, or use an external rod lock. Because the 685 mm stroke is long, use an external guide to prevent rod bending and side-load damage. Rod options include carbon steel, SUS420J2 (A) or SUS304 (B).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI160X685S
- ✓ 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 SI160X685S FAQ
Yes, the SI160X685S is discontinued. The direct replacement is the SAI160X685S. It shares the same ISO 15552 mounting interface, 160 mm bore, 685 mm stroke, output force and G3/4 port, fitting existing fixtures directly.
It features a G3/4 port and M36x2 rod thread. Force output is 10053 N push and 9425 N pull at 0.5 MPa, 14074 N push at 0.7 MPa, 18095 N push at 0.9 MPa, and a theoretical maximum of 2050 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI160X685S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI160X685S replacement — usually within 7-8 hours.