This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X25TC, 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 SI63X25TC
The AirTAC Airtac SI63 Standard Cylinder SI63X25TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 25mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X25TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke25 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X25TC
- 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 SI63X25TC
The AirTAC SI63X25TC is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 25 mm stroke, delivering 1559 N push force at 0.5 MPa. As an end-of-line product, it is superseded by the SAI63X25TC. This direct replacement shares the exact ISO 15552 mounting interface, TC trunnion mount, G3/8 port and M16x1.5 rod thread, fitting existing fixtures perfectly.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks the -S magnet, so it cannot accept CS1-B/DS1-B sensors. If you need load holding on air loss, explore the SAIL or BSAI lock variants, as standard cushions only decelerate.
Airtac SI63 Standard Cylinder SI63X25TC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X25TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X25TC |
| Bore size | Ø63 mm |
| Stroke | 25 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 SAI63X25TC 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 SAI63X25TC 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 SI63X25TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×25 | 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 SI63X25TC Is Used
Short-Stroke Clamping
Ideal for holding parts during machining, using its 1559 N push force at 0.5 MPa to secure heavy workpieces firmly in automated fixtures.
Transfer Line Stops
Provides robust actuation for pallet stops in material handling systems, where the 63 mm bore and TC mount handle high kinetic impacts reliably.
Ejector Mechanisms
Delivers rapid 25 mm ejection strokes in assembly machinery, benefiting from the 30-800 mm/s speed range to cycle parts out of the work zone quickly.
Replacing the Airtac SI63 Standard Cylinder SI63X25TC with the SAI63X25TC
To replace the discontinued SI63X25TC, order the SAI63X25TC keeping the identical 63 mm bore, 25 mm stroke, G3/8 port and TC trunnion mounting. Because this unit lacks the -S suffix, it has no magnet and cannot support position sensing; add the S suffix to your SAI order if you require switches. 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 drifts without live air; for secure load holding, select the SAIL or BSAI lock variant, or use an external pilot check valve. The 25 mm stroke is very short, so rod-bending side loads are minimal compared to longer strokes.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X25TC
- ✓ 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 SI63X25TC FAQ
Yes, the AirTAC SI63X25TC is discontinued. The direct replacement is the SAI63X25TC. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 25 mm stroke, G3/8 port, M16x1.5 thread and TC mounting interface.
The G3/8 port feeds a 20 mm piston rod. At 0.5 MPa it outputs 1559 N push and 1402 N pull. This rises to 2182 N push at 0.7 MPa and 2805 N at 0.9 MPa, with a theoretical maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X25TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X25TC replacement — usually within 7-8 hours.