This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X125CA, 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 SI63X125CA
The AirTAC Airtac SI63 Standard Cylinder SI63X125CA 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 SAI63X125CA, 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 → SAI63X125CA
- 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 SI63X125CA
The AirTAC SI63X125CA is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 125mm stroke. Delivering 1559N push force at 0.5MPa via a G3/8 port, it is directly replaced by the SAI63X125CA. This direct upgrade shares the exact same ISO 15552 mounting interface, CA clevis accessory, and output force. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
Because this specific SKU lacks the -S magnet suffix, it cannot accept a CS1-B or DS1-B sensor. The SAI family also introduces SAIL, SAIF, and BSAI variants for locking and integrated valve needs that the legacy SI lacked. Note that a standard cylinder does not hold load without live air; the cushion only decelerates. For load holding, consider an external pilot check valve or the SAIL lock variant. Rod material options include carbon steel, SUS420J2, or SUS304.
Airtac SI63 Standard Cylinder SI63X125CA Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X125CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X125CA |
| 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 SAI63X125CA 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 SAI63X125CA 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 SI63X125CA
| 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 SI63X125CA Is Used
Clamping Fixtures
Secures mid-weight machined components during milling or drilling operations using the 1559N push force at 0.5MPa.
Material Diversion
Actuates pivot arms to route packages along processing lines, utilizing the 125mm stroke and CA clevis for smooth rotation.
Replacing the Airtac SI63 Standard Cylinder SI63X125CA with the SAI63X125CA
To replace the discontinued SI63X125CA, order the SAI63X125CA. Verify the ISO 15552 interface, 63mm bore, 125mm stroke, G3/8 port, and CA clevis mounting. This SKU has no magnet, so it cannot support position sensing; order the -S suffix on the SAI if you need switches. For sizing, neighboring bores are 50mm (982N push at 0.5MPa) and 80mm (2513N push). The 125mm stroke is under the 300mm threshold, so rod-bending side-load risks are minimal, but always ensure linear guidance. A plain cylinder drifts on air loss; for load holding, use an external rod lock or pilot check valve, or step up to the SAIL or BSAI lock variant. The SAI also offers SAIF integrated valve options for bores up to 100mm.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X125CA
- ✓ 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 SI63X125CA FAQ
Yes, the AirTAC SI63X125CA is discontinued. The direct replacement is the SAI63X125CA. It shares the identical ISO 15552 mounting interface, 63mm bore, 125mm stroke, G3/8 port, and CA clevis, fitting existing fixtures perfectly while upgrading the piston seal.
The 63mm bore features a G3/8 port and delivers 1559N push / 1402N pull at 0.5MPa, 2182N push at 0.7MPa, and a theoretical maximum of 318kgf at 1.0MPa. It operates at 30-800mm/s with a 30mm adjustable air cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X125CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X125CA replacement — usually within 7-8 hours.