This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X125H, 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 SI63X125H
The AirTAC Airtac SI63 Standard Cylinder SI63X125H 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 SAI63X125H, 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 → SAI63X125H
- 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 SI63X125H
The AirTAC SI63X125H is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 125 mm stroke. As an end-of-line unit delivering 1559 N push force at 0.5 MPa via a G3/8 port, it is replaced directly by the SAI63X125H. The SAI direct maintains identical ISO 15552 mounting dimensions, bore, stroke, output force, and porting for seamless fixture integration. This specific SKU lacks a magnet and cannot accept position sensors.
The SAI upgrade introduces an improved piston seal featuring two Y-shaped one-way elements for low start-up pressure and extended service life. This SI63X125H variant utilizes a high-temperature Viton H seal, raising the operating ceiling to 150 C. Note that plain cylinders drift on air loss; for load holding, consider the SAIL lock or BSAI clamp-lock variants.
Airtac SI63 Standard Cylinder SI63X125H Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X125H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X125H |
| 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 SAI63X125H 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 SAI63X125H 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 SI63X125H
| 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 SI63X125H Is Used
Hot Metal Ejection
Uses the Viton H high-temperature seal to reliably push 1559 N when ejecting forged parts from 150 C environments.
Diversion Gate
Drives heavy-duty routing gates on assembly lines, taking advantage of the 30-800 mm/s speed range and G3/8 port.
Replacing the Airtac SI63 Standard Cylinder SI63X125H with the SAI63X125H
To replace the discontinued SI63X125H, order the SAI63X125H, confirming the ISO 15552 mounting interface, 63 mm bore, 125 mm stroke, and G3/8 port. Because this SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order an -S suffix if sensing is required. The standard carbon steel rod can be upgraded to SUS420J2 (A) or SUS304 (B). For sizing alternatives, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Remember that a standard cylinder does not hold load without live air; the cushions only decelerate. For secure holding, use an external pilot check valve or explore the SAIL and BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X125H
- ✓ 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 SI63X125H FAQ
Yes, the AirTAC SI63X125H is discontinued. The direct replacement is the SAI63X125H. It is dimensionally interchangeable per ISO 15552, matching the exact bore, stroke, 1559 N force, G3/8 port, and mounting interface.
It features a G3/8 air port and an M16x1.5 rod thread. Force output is 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 maximum theoretical force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X125H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X125H replacement — usually within 7-8 hours.