This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X300H, 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 SI63X300H
The AirTAC Airtac SI63 Standard Cylinder SI63X300H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 300mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X300H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke300 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X300H
- 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 SI63X300H
The AirTAC SI63X300H is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 300 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63X300H, matching the interface, force, and mounting exactly. This SKU has no magnet, so it cannot accept a sensor.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Because this is the -H variant, it uses Viton FKM seals rated for 0 to 150 C.
Airtac SI63 Standard Cylinder SI63X300H Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X300H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X300H |
| Bore size | Ø63 mm |
| Stroke | 300 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 SAI63X300H 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 SAI63X300H 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 SI63X300H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×300 | 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 SI63X300H Is Used
High-Temperature Ejection
Ejecting molded parts from hot environments using the Viton H seal, safely handling a 935 N working load at sustained elevated ambient temperatures.
Long-Stroke Diversion
Actuating a diverter gate over a 300 mm travel distance, requiring external guide rails to prevent rod bending during heavy lateral package routing.
Pneumatic Clamping
Securing heavy workpieces with 1559 N of push force at 0.5 MPa, utilizing the G3/8 port for rapid fill and exhaust during automated machining cycles.
Replacing the Airtac SI63 Standard Cylinder SI63X300H with the SAI63X300H
To replace the SI63X300H, order the SAI63X300H. Verify the ISO 15552 mounting interface, 300 mm stroke, G3/8 port, and M16x1.5 rod thread. If you need load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 300 mm stroke, prevent rod bending by using external guides to handle side loads. To size up, an 80 mm bore yields 2513 N at 0.5 MPa; sizing down, a 50 mm bore gives 982 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X300H
- ✓ 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 SI63X300H FAQ
Yes, the SI63X300H is discontinued. The direct replacement is the SAI63X300H. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 300 mm stroke, G3/8 port, and mounting interface.
The G3/8 port supplies 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N at 0.9 MPa, and a 318 kgf maximum at 1.0 MPa. This no-magnet SKU cannot accept a sensor.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X300H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X300H replacement — usually within 7-8 hours.