This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X125N, 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 SI63X125N
The AirTAC Airtac SI63 Standard Cylinder SI63X125N 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 SAI63X125N, 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 → SAI63X125N
- 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 SI63X125N
The AirTAC SI63X125N is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 125 mm stroke. Built with an extruded aluminum barrel and adjustable air cushions, it delivers 1559 N push and 1402 N pull at 0.5 MPa through a G3/8 port. Because this SI series is end-of-life, you should order the direct replacement: SAI63X125N. It shares the same ISO 15552 mounting interface, M16x1.5 rod thread, and force ratings, fitting existing fixtures perfectly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This specific SKU lacks a magnet (-S), meaning it cannot accept position sensors like the legacy CS1-B or DS1-B switches. Note that a plain cylinder drifts on air loss; for load holding, consider the SAIL lock or BSAI clamp-lock variants.
Airtac SI63 Standard Cylinder SI63X125N Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X125N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X125N |
| 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 SAI63X125N 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 SAI63X125N 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 SI63X125N
| 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 SI63X125N Is Used
Mid-Tonnage Pressing
Applies 1559 N of push force at 0.5 MPa for seating bearings, stamping light plates, or clinching components in automated cells.
Package Diversion
Drives 125 mm stroke diverters or sorting gates along handling lines, using adjustable cushions to soften end-of-stroke impacts.
Pallet Lift Stops
Acts as a robust physical stop or positioning pin for 79 kg vertical load cases, guided externally to prevent rod bending.
Replacing the Airtac SI63 Standard Cylinder SI63X125N with the SAI63X125N
To replace the discontinued SI63X125N, order the SAI63X125N, confirming the ISO 15552 mounting interface, 63 mm bore, 125 mm stroke, G3/8 port (PT/G/NPT thread options), and your mounting accessory (LB, FA, TC, etc.). This non-magnetic SKU cannot take a sensor; if you need position detection, select an SAI63X125NS. Sizing both ways: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. Remember, a standard cylinder does not hold load without live air—the cushion only decelerates. For holding needs, use an external pilot check valve or explore the SAIL (air-released lock) and BSAI (clamp-lock) variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X125N
- ✓ 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 SI63X125N FAQ
Yes, the SI63X125N is discontinued. The direct replacement is the AirTAC SAI63X125N. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 125 mm stroke, G3/8 port, and mounting footprint to fit existing fixtures directly.
The 63 mm bore features a G3/8 air port and M16x1.5 rod thread. It generates 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 maximum of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X125N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X125N replacement — usually within 7-8 hours.