This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X25CB, 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 SI63X25CB
The AirTAC Airtac SI63 Standard Cylinder SI63X25CB 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 SAI63X25CB, 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 → SAI63X25CB
- 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 SI63X25CB
The AirTAC SI63X25CB is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 25 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63X25CB, which matches the original CB clevis mount, M16x1.5 rod thread, and output force exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. Because this specific SI SKU lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor.
Airtac SI63 Standard Cylinder SI63X25CB Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X25CB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X25CB |
| 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 SAI63X25CB 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 SAI63X25CB 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 SI63X25CB
| 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 SI63X25CB Is Used
Short-Stroke Clamping
Ideal for applying 1559 N of clamping pressure in automated machining fixtures where only 25 mm of travel is needed to secure the part.
Package Diverting
Provides rapid 30-800 mm/s actuation for conveyor belt sorting gates, using the CB clevis to pivot the diverter arm efficiently.
Pallet Stop Gates
Delivers 2182 N at 0.7 MPa to halt pallets on a roller conveyor, retracting quickly into a recessed pocket to clear the passing load.
Replacing the Airtac SI63 Standard Cylinder SI63X25CB with the SAI63X25CB
To replace the SI63X25CB, order the SAI63X25CB. It is dimensionally interchangeable per the ISO 15552 mounting interface, preserving the existing CB clevis mounting, 63 mm bore, 25 mm stroke, and G3/8 port. If you need more force, the neighboring 80 mm bore provides 2513 N push at 0.5 MPa; if less is required, the 50 mm bore offers 982 N. This plain cylinder does not hold load without live air, so for vertical or safety-critical holding, consider the SAIL lock, BSAI clamp-lock, or an external pilot check valve. The 25 mm stroke is very short, so rod-bending side loads are minimal, but ensure the CB clevis pin is lubricated to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X25CB
- ✓ 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 SI63X25CB FAQ
Yes, the SI63X25CB is discontinued. The direct replacement is the AirTAC SAI63X25CB. It features the same ISO 15552 mounting interface, 63 mm bore, 25 mm stroke, CB clevis mount, and G3/8 port, fitting directly into existing fixtures.
The 63 mm bore uses a G3/8 port and features a 20 mm rod with an M16x1.5 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X25CB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X25CB replacement — usually within 7-8 hours.