This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X250TC, 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 SI63X250TC
The AirTAC Airtac SI63 Standard Cylinder SI63X250TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 250mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X250TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X250TC
- 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 SI63X250TC
The AirTAC SI63X250TC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 250mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X250TC, a direct upgrade retaining the exact ISO 15552 mounting interface, TC trunnion mount, and output force.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet (-S) and cannot accept position sensors.
Airtac SI63 Standard Cylinder SI63X250TC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X250TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X250TC |
| Bore size | Ø63 mm |
| Stroke | 250 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 SAI63X250TC 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 SAI63X250TC 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 SI63X250TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×250 | 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 SI63X250TC Is Used
Mid-Tonnage Clamping
Secures heavy workpieces in machining fixtures using 1559 N of thrust at 0.5 MPa, guided by the TC trunnion to accommodate slight misalignment.
Material Lift Gates
Actuates heavy transfer gates in logistics hubs, relying on the 250mm stroke and ISO 15552 profile durability for repetitive cycling.
Replacing the Airtac SI63 Standard Cylinder SI63X250TC with the SAI63X250TC
To replace the SI63X250TC, order the SAI63X250TC. Verify the ISO 15552 TC trunnion mounting dimensions, 63mm bore, 250mm stroke, and G3/8 port (available in PT, G, or NPT threads). Because this SKU has no magnet, it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, select an SAI model with the -S suffix. For sizing, the 63mm bore yields 1559 N push at 0.5 MPa; if less force is acceptable, a 50mm bore provides 982 N, while an 80mm bore offers 2513 N. A standard double-acting cylinder drifts on air loss—the cushion only decelerates near stroke ends—so for load holding, consider an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. At 250mm stroke, guide the load to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X250TC
- ✓ 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 SI63X250TC FAQ
Yes, the SI63X250TC is discontinued. The direct replacement is the SAI63X250TC. It shares the same ISO 15552 TC mounting interface, 63mm bore, 250mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The 63mm bore uses a G3/8 port. 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X250TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X250TC replacement — usually within 7-8 hours.