This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X65, 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 SI63X65
The AirTAC SI63 Standard Cylinder SI63X65 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 65mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X65, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke65 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X65
- 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 SI63X65
The AirTAC SI63X65 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 65 mm stroke, delivering 1559 N push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI63X65, a direct replacement retaining the exact ISO 15552 mounting interface, G3/8 port, and M16x1.5 rod thread.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Since this specific SI63X65 SKU lacks the -S magnet suffix, it cannot accept a position sensor.
Airtac SI63 Standard Cylinder SI63X65 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X65 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X65 |
| Bore size | Ø63 mm |
| Stroke | 65 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 SAI63X65 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 SAI63X65 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 SI63X65
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×65 | 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 SI63X65 Is Used
Mid-Tonnage Clamping
Secures heavy workpieces during machining operations, utilising the 1559 N push force at 0.5 MPa to hold components rigidly against cutting forces.
Package Diversion
Actuates routing gates or pusher arms on assembly lines, where the 65 mm stroke quickly redirects products without delaying throughput.
Pallet Stopper Arms
Deploys a mechanical stop to halt pallets at specific workstations, absorbing kinetic energy using the adjustable 30 mm air cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X65 with the SAI63X65
To replace the SI63X65, order the SAI63X65 and verify your ISO 15552 mounting fixture, G3/8 port, and M16x1.5 rod end thread. Because this SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B switches; add the S suffix on the SAI order if sensing is needed. Sizing both ways: the 63 mm bore yields 1559 N push at 0.5 MPa, whereas a neighbouring 80 mm bore provides 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external pilot check valve or the SAIL/BSAI lock variant for load holding. The 65 mm stroke is well under the 1500 mm standard limit, so rod bending is negligible.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X65
- ✓ 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 SI63X65 FAQ
Yes, the SI63X65 is discontinued. The direct replacement is the AirTAC SAI63X65. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 65 mm stroke, G3/8 port, and mounting interface, so it drops directly into existing fixtures.
The 63 mm bore uses a G3/8 air port. At 0.5 MPa it provides 1559 N push and 1402 N pull force. 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.
Request a Quote for the SAI63X65
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X65 replacement — usually within 7-8 hours.