This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI160AX550S, 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 SI160AX550S
The AirTAC SI160 Standard Cylinder SI160AX550S 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 SAI160AX550S, 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 → SAI160AX550S
- 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 SI160AX550S
The AirTAC SI160AX550S is a discontinued double-acting ISO 15552 profile cylinder with a 160 mm bore, 550 mm stroke, SUS420J2 stainless rod, and a piston magnet for CS1-B/DS1-B sensors. Delivering 10053 N push force at 0.5 MPa, it is replaced by the SAI160AX550S. This direct successor retains the exact G3/4 port, M36x2 thread, and ISO 15552 mounting interface, fitting existing fixtures perfectly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note that plain cylinders drift without air; for load holding, use the SAIL or BSAI lock variants.
Airtac SI160 Standard Cylinder SI160AX550S Technical Specifications
| Model | Airtac SI160 Standard Cylinder SI160AX550S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI160AX550S |
| 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 SAI160AX550S 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 SAI160AX550S 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 SI160AX550S
| 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 SI160AX550S Is Used
Heavy Pressing
Drives large stamping and forming presses requiring up to 14074 N of thrust at 0.7 MPa.
Pallet Handling
Indexes heavy loaded pallets over 550 mm cycles where a 512 kg vertical lift margin is needed.
Mold Actuation
Shifts substantial injection molds or tooling using the corrosion-resistant SUS420J2 rod.
Replacing the Airtac SI160 Standard Cylinder SI160AX550S with the SAI160AX550S
To replace this SI160AX550S, order the SAI160AX550S. Confirm the ISO 15552 mounting interface, 550 mm stroke, G3/4 port, and the -S magnet for current AirTAC switches. Sizing both ways: the 160 mm bore yields 10053 N push at 0.5 MPa (max 2050 kgf at 1.0 MPa), while the neighbouring 125 mm bore offers 6136 N. The -A rod is SUS420J2 stainless steel. Because the 550 mm stroke is long, use external guides to prevent rod bending and side loads. The cushion only decelerates; it does not hold load, so add a pilot check valve or explore the SAIL/BSAI lock variants for drop protection.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI160AX550S
- ✓ 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 SI160AX550S FAQ
Yes, the SI160AX550S is discontinued. The direct replacement is the SAI160AX550S. It is dimensionally interchangeable per ISO 15552, retaining the same 160 mm bore, 550 mm stroke, G3/4 port, and mounting interface.
It features a G3/4 port and provides 10053 N push / 9425 N pull at 0.5 MPa, 14074 N push at 0.7 MPa, and a theoretical max of 2050 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI160AX550S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI160AX550S replacement — usually within 7-8 hours.