This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X125SCA, 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 SI63X125SCA
The AirTAC Airtac SI63 Standard Cylinder SI63X125SCA 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 SAI63X125SCA, 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 → SAI63X125SCA
- 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 SI63X125SCA
The AirTAC SI63X125SCA is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 125mm stroke and CA clevis mounting. Delivering 1559 N push force at 0.5 MPa via a G3/8 port, it is replaced by the direct replacement SAI63X125SCA, which shares the exact same 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 original SI-S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. For high heat, Viton H seals raise the temperature limit to 150 C.
Airtac SI63 Standard Cylinder SI63X125SCA Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X125SCA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X125SCA |
| 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 SAI63X125SCA 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 SAI63X125SCA 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 SI63X125SCA
| 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 SI63X125SCA Is Used
Clamp Actuation
Secures heavy machining fixtures with 1559 N of push force at 0.5 MPa, utilizing the CA clevis to accommodate slight pivot alignment during the clamping cycle.
Package Diversion
Drives pivot-arm diverters along packaging lines, where the 125 mm stroke and 30-800 mm/s speed range provide rapid, precise routing of goods.
Replacing the Airtac SI63 Standard Cylinder SI63X125SCA with the SAI63X125SCA
To replace the SI63X125SCA, order the SAI63X125SCA. Confirm the ISO 15552 CA clevis mounting, 125mm stroke, G3/8 port (PT/G/NPT) and the -S magnet for current AirTAC switches. Sizing both ways: the 63mm bore yields 1559 N push at 0.5 MPa; dropping to a 50mm bore gives 982 N, while an 80mm bore provides 2513 N. A plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve (bores 32-100).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X125SCA
- ✓ 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 SI63X125SCA FAQ
Yes, the AirTAC SI63X125SCA is discontinued. The direct replacement is the SAI63X125SCA. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 63mm bore, 125mm stroke, CA clevis mount, G3/8 port and output force.
The 63mm bore features a G3/8 air port and a 20mm rod. At 0.5 MPa it delivers 1559 N push and 1402 N pull. At 0.7 MPa push is 2182 N, and at 0.9 MPa it is 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X125SCA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X125SCA replacement — usually within 7-8 hours.