This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X125SN, 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 SI63X125SN
The AirTAC Airtac SI63 Standard Cylinder SI63X125SN 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 SAI63X125SN, 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 → SAI63X125SN
- 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 SI63X125SN
The AirTAC SI63X125SN is a discontinued double-acting ISO 15552 profile cylinder. Delivering 1559 N push force at 0.5 MPa through a 63 mm bore, it is replaced by the SAI63X125SN. This direct successor shares the exact ISO 15552 mounting interface, 125 mm stroke, G3/8 port, and output force. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
This unit includes a piston magnet for CS1-B/DS1-B switches and an NBR seal (-N) rated for -20 to +70 C. For heat up to 150 C, specify Viton H. Note that a plain cylinder drifts on air loss; the cushion only decelerates.
Airtac SI63 Standard Cylinder SI63X125SN Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X125SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X125SN |
| 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 SAI63X125SN 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 SAI63X125SN 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 SI63X125SN
| 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 SI63X125SN Is Used
Clamping Fixtures
Holds workpieces securely in machining jigs using 1559 N of thrust at 0.5 MPa, with adjustable cushions absorbing end-of-stroke impact.
Package Diverting
Pushes cartons off a main belt in sorting lines, where the 125 mm stroke and 79 kg vertical lift margin provide reliable lateral actuation.
Pallet Stops
Acts as a pneumatic stop gate for incoming pallets, utilizing the G3/8 port for rapid cycling and the ISO 15552 profile for bracket flexibility.
Replacing the Airtac SI63 Standard Cylinder SI63X125SN with the SAI63X125SN
To replace the SI63X125SN, order the SAI63X125SN. Verify the ISO 15552 mounting accessory (LB, FA, TC, etc.), the 125 mm stroke, and the G3/8 port. Keep the -S for the magnet and -N for the NBR seal. If sizing up or down, adjacent bores are 50 mm (982 N push @0.5 MPa) and 80 mm (2513 N push @0.5 MPa). Because a standard cylinder drifts without live air, use an external pilot check valve or the SAIL/BSAI lock variant for load holding. The 125 mm stroke is under 300 mm, so rod bending is minimal, but always guide the load to prevent side-loading.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X125SN
- ✓ 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 SI63X125SN FAQ
Yes, the SI63X125SN is discontinued. The direct replacement is the SAI63X125SN. It matches the ISO 15552 mounting interface, 63 mm bore, 125 mm stroke, output force, and G3/8 port, so it drops into existing fixtures. The SAI simply upgrades the piston seal for longer life.
The bore is 63 mm with a G3/8 air port. At 0.5 MPa it provides 1559 N push and 1402 N pull force. 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 SAI63X125SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X125SN replacement — usually within 7-8 hours.