This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X173S, 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 SI63 Standard Cylinder SI63X173S
The AirTAC Airtac SI63 Standard Cylinder SI63X173S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 173mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X173S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke173 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X173S
- 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 SI63 Standard Cylinder SI63X173S
The AirTAC SI63X173S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore and 173 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X173S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI successor introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line. This SI63X173S includes a magnetic piston for CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X173S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X173S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X173S |
| Bore size | Ø63 mm |
| Stroke | 173 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI63X173S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
The SAI63X173S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI63 Standard Cylinder SI63X173S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×173 | 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 SI63 Standard Cylinder SI63X173S Is Used
Clamping Fixtures
Secures heavy metal workpieces during machining.
Package Diversion
Actuates routing gates on assembly lines. The 173 mm stroke pushes cartons smoothly between parallel conveyor belts.
Pallet Stops
Controls pallet flow on roller conveyors. The 63 mm bore handles heavy pallets while the magnetic piston confirms stop position.
Replacing the Airtac SI63 Standard Cylinder SI63X173S with the SAI63X173S
To replace the SI63X173S, order the SAI63X173S. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G3/8 port thread (PT, G, or NPT), and the M16x1.5 rod-end connection. The -S suffix indicates a magnetic piston for position sensing; the original SI used CS1-B/DS1-B switches, while the SAI uses current AirTAC sensors. For sizing, the 63 mm bore yields 1559 N push at 0.5 MPa; if less force is needed, a 50 mm bore provides 982 N, or an 80 mm bore offers 2513 N. A plain cylinder drifts without live air, so for load holding consider an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X173S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI63 Standard Cylinder SI63X173S FAQ
Yes, the SI63X173S is discontinued. The direct replacement is the AirTAC SAI63X173S. It shares the same ISO 15552 mounting interface, 63 mm bore, 173 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The 63 mm bore features a G3/8 air port and M16x1.5 rod thread. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N at 0.9 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X173S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X173S replacement — usually within 7-8 hours.