This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI160X550, 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 SI160X550
The AirTAC SI160 Standard Cylinder SI160X550 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø160mm bore and 550mm stroke, G3/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI160X550, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ160 mm
- Stroke550 mm
- Port sizeG3/4
- Acting typeDouble acting
- Rod threadM36×2.0
- StatusDiscontinued → SAI160X550
- 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 SI160X550
The AirTAC SI160X550 is a discontinued double-acting ISO 15552 profile cylinder, delivering a push force of 10053 N at 0.5 MPa. AirTAC replaced this end-of-line unit with the SAI160X550 direct replacement. It shares the exact same 160 mm bore, 550 mm stroke, G3/4 port, and ISO 15552 mounting interface, dropping straight into existing fixtures without mechanical changes.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This SKU lacks a magnet and cannot accept a sensor; the SI family used CS1-B/DS1-B switches, while SAIL lock and BSAI clamp-lock variants offer new load-holding options.
Airtac SI160 Standard Cylinder SI160X550 Technical Specifications
| Model | Airtac SI160 Standard Cylinder SI160X550 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI160X550 |
| Bore size | Ø160 mm |
| Stroke | 550 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 SAI160X550 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 SAI160X550 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 SI160X550
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 160 | Bore size in mm. |
| ×550 | 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 SI160X550 Is Used
Heavy Machinery Forming
Drives large platens in metal bending and forming presses, utilizing the 14074 N push force at 0.7 MPa to shape thick plate stock reliably.
Palletized Load Shifting
Transfers heavy palletized goods across automated distribution lines, where the 550 mm stroke provides the extended reach needed for multi-lane sorting.
Automated Clamp Actuation
Actuates robust clamping arms on large machining centers, applying up to 18095 N at 0.9 MPa to secure cast components during heavy milling.
Replacing the Airtac SI160 Standard Cylinder SI160X550 with the SAI160X550
To replace the discontinued SI160X550, order the SAI160X550. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G3/4 air port, and the M36x2 rod thread. Because this 550 mm stroke exceeds 300 mm, use an external guide to prevent rod bending and side-load damage. If sizing alternatives, neighboring bores (125 mm or 200 mm) shift the 0.5 MPa push force down to 6136 N or up to 15708 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding, specify the SAIL or BSAI lock variant, or add an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI160X550
- ✓ 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 SI160X550 FAQ
Yes, the SI160X550 is discontinued. The direct replacement is the AirTAC SAI160X550. It is dimensionally interchangeable per ISO 15552, retaining the same 160 mm bore, 550 mm stroke, G3/4 port, and mounting interface for a seamless fixture swap.
This double-acting cylinder uses a G3/4 air port. It generates 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 the theoretical maximum force is 2050 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI160X550
Send us the quantity and destination. We confirm price, stock and lead time on the SAI160X550 replacement — usually within 7-8 hours.