This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X172S, 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 SI63X172S
The AirTAC Airtac SI63 Standard Cylinder SI63X172S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 172mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X172S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke172 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X172S
- 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 SI63X172S
The AirTAC SI63X172S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore and 172 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63X172S, matching the interface, bore, stroke, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X172S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X172S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X172S |
| Bore size | Ø63 mm |
| Stroke | 172 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 SAI63X172S 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 SAI63X172S 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 SI63X172S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×172 | 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 SI63X172S Is Used
Clamp Actuation
Provides 1559 N of secure clamping force at 0.5 MPa for holding medium-weight machined parts during milling or drilling operations.
Package Diversion
Uses the 172 mm stroke to push medium cartons off a main conveyor belt line at speeds up to 800 mm/s.
Pallet Stops
Acts as a robust pneumatic stop gate for pallets up to 79 kg, utilizing the 63 mm bore profile barrel for rigidity.
Replacing the Airtac SI63 Standard Cylinder SI63X172S with the SAI63X172S
To replace this SI63X172S, order the SAI63X172S. Confirm the ISO 15552 mounting interface, 63 mm bore, 172 mm stroke, G3/8 port (PT/G/NPT), and mounting accessory. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches. Sizing both ways: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. A plain cylinder drifts on air loss; the cushion only decelerates. For held loads, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Since the 172 mm stroke is under 300 mm, severe rod-bending side loads are less likely, but always guide the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X172S
- ✓ 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 SI63X172S FAQ
Yes, the AirTAC SI63X172S is discontinued. The direct replacement is the SAI63X172S. It is dimensionally interchangeable per ISO 15552, keeping the same 63 mm bore, 172 mm stroke, output force, G3/8 port, and mounting fixtures.
This double-acting 63 mm bore cylinder uses a G3/8 air port. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical max force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X172S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X172S replacement — usually within 7-8 hours.