This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X125, 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 SI63X125
The AirTAC Airtac SI63 Standard Cylinder SI63X125 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 125mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X125, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke125 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X125
- 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 SI63X125
The AirTAC SI63X125 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 125mm stroke. It delivers 1559N push force at 0.5MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X125, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, port and mounting accessories.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL, SAIF and BSAI lock variants absent in the SI line. Note: this specific SKU lacks a magnet and cannot accept a CS1-B/DS1-B sensor.
Airtac SI63 Standard Cylinder SI63X125 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X125 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X125 |
| Bore size | Ø63 mm |
| Stroke | 125 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 SAI63X125 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 SAI63X125 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 SI63X125
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×125 | 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 SI63X125 Is Used
Clamp Actuation
Secures heavy workpieces in machining fixtures, using its 1559N thrust at 0.5MPa to hold parts firmly against cutting forces.
Diversion Gates
Drives heavy-duty routing flaps on packaging lines, where the 125mm stroke provides rapid and positive lane switching.
Pallet Stops
Acts as a robust pneumatic stop mechanism for loaded pallets on roller conveyors, absorbing momentum via its adjustable cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X125 with the SAI63X125
To replace the SI63X125, order the SAI63X125. Confirm the ISO 15552 mounting interface, 63mm bore, 125mm stroke, G3/8 port (PT/G/NPT thread options) and your mounting accessory (LB, FA, CA, TC, etc.). Because this SKU lacks the -S magnet, it cannot hold a sensor; if position detection is needed, select an SAI63X125S. For sizing, the 63mm bore yields 1559N push at 0.5MPa; if less force is needed, a 50mm bore gives 982N, while an 80mm bore provides 2513N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 125mm stroke, side-load risks are minimal, but ensure front mounting alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X125
- ✓ 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 SI63X125 FAQ
Yes, the SI63X125 is discontinued. The direct replacement is the AirTAC SAI63X125. It shares the same ISO 15552 mounting interface, 63mm bore, 125mm stroke, output force, G3/8 port and mounting accessories, fitting directly into existing fixtures.
This double-acting cylinder features a G3/8 air port. The thrust ratings are: 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum force of 318kgf at 1.0MPa.
Request a Quote for the SAI63X125
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X125 replacement — usually within 7-8 hours.