This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X305S, 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 SI63X305S
The AirTAC Airtac SI63 Standard Cylinder SI63X305S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 305mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X305S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke305 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X305S
- 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 SI63X305S
The AirTAC SI63X305S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore and 305 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X305S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding on air loss, the SAI family adds SAIL and BSAI lock variants absent in the SI line. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X305S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X305S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X305S |
| Bore size | Ø63 mm |
| Stroke | 305 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 SAI63X305S 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 SAI63X305S 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 SI63X305S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×305 | 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 SI63X305S Is Used
Package Diversion
Pushes medium-weight cartons off a main conveyor line utilizing the 1559 N push force and 305 mm travel distance.
Clamp Actuation
Drives mid-sized machining clamps where 1402 N pull force secures the part, relying on live air to maintain holding pressure.
Replacing the Airtac SI63 Standard Cylinder SI63X305S with the SAI63X305S
To replace the discontinued SI63X305S, order the SAI63X305S. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC, etc.), the G3/8 port, and the M16x1.5 rod thread. The -S magnet is required for switch sensing. Sizing both ways: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. For this 305 mm stroke, add external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or specify the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X305S
- ✓ 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 SI63X305S FAQ
Yes, the SI63X305S is discontinued. The direct replacement is the AirTAC SAI63X305S. It shares the same ISO 15552 mounting interface, 63 mm bore, 305 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The G3/8 port feeds a 63 mm bore generating 1559 N push and 1402 N pull at 0.5 MPa. At 0.7 MPa push is 2182 N, and 2805 N at 0.9 MPa. The theoretical maximum force is 318 kgf at 1.0 MPa. Speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X305S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X305S replacement — usually within 7-8 hours.