This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X670, 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 SI63X670
The AirTAC Airtac SI63 Standard Cylinder SI63X670 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 670mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X670, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke670 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X670
- 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 SI63X670
The AirTAC SI63X670 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 670 mm stroke. Delivering 1559 N push force at 0.5 MPa through a G3/8 port, it is directly replaced by the SAI63X670. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force and port, so it fits existing fixtures without modification. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also expands options with SAIL, SAIF and BSAI variants the SI lacked. This non-magnet SKU cannot take a sensor.
The SAI family accepts Viton H seals for 0-150 C environments, and legacy CS1-B/DS1-B sensors fit the -S magnet versions. Because this is a 670 mm stroke, external guides are recommended to prevent rod bending under side loads.
Airtac SI63 Standard Cylinder SI63X670 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X670 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X670 |
| Bore size | Ø63 mm |
| Stroke | 670 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 SAI63X670 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 SAI63X670 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 SI63X670
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×670 | 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 SI63X670 Is Used
Long-Stroke Diversion
Pushes packages across a 670 mm transfer gap with 1559 N force, guided externally to prevent rod bending.
Multi-Station Indexing
Shifts a tooling pallet between machining cells, relying on the G3/8 port for rapid actuation.
Replacing the Airtac SI63 Standard Cylinder SI63X670 with the SAI63X670
To replace the SI63X670, order the SAI63X670. Confirm the ISO 15552 mounting accessory (LB, FA, CA, TC), the G3/8 port thread (PT/G/NPT) and the M16x1.5 rod end. This non-magnet SKU cannot accept a magnetic switch; order a -S version if you need CS1-B/DS1-B sensing. Sizing both ways: the 63 mm bore gives 1559 N push at 0.5 MPa, while the neighbouring 80 mm bore offers 2513 N. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For the 670 mm stroke, use external guides to manage side loads and prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X670
- ✓ 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 SI63X670 FAQ
Yes, the SI63X670 is discontinued. The direct replacement is the AirTAC SAI63X670. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 670 mm stroke, G3/8 port, output force and mounting interface.
This double-acting cylinder has a 20 mm rod, M16x1.5 thread, 30 mm cushion, and operates at 30-800 mm/s. Force ratings are: 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 318 kgf maximum at 1.0 MPa.
Request a Quote for the SAI63X670
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X670 replacement — usually within 7-8 hours.