This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X70FTC, 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 SI63X70FTC
The AirTAC SI63 Standard Cylinder SI63X70FTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 70mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X70FTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke70 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X70FTC
- 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 SI63X70FTC
The AirTAC SI63X70FTC is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 70 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X70FTC, a direct sharing the exact FTC trunnion mount, M16x1.5 rod thread and 30 mm cushions.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this non-magnet SKU cannot accept a CS1-B/DS1-B sensor. For high heat, a Viton H seal raises the limit to 150 C.
Airtac SI63 Standard Cylinder SI63X70FTC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X70FTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X70FTC |
| Bore size | Ø63 mm |
| Stroke | 70 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 SAI63X70FTC 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 SAI63X70FTC 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 SI63X70FTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×70 | 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 SI63X70FTC Is Used
Trunnion-Mounted Diverter
Uses the FTC pivot to swing heavy package routing gates on packaging lines, reliably pushing 79 kg vertical-equivalent loads.
Mid-Force Clamp Actuator
Generates 1559 N at 0.5 MPa to secure medium aluminum housings during CNC machining without shifting the fixture footprint.
Pallet Stop Mechanism
Deploys a 70 mm stroke to halt inbound pallets on roller conveyors, absorbing kinetic energy via the 30 mm adjustable cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X70FTC with the SAI63X70FTC
To replace the SI63X70FTC, order the SAI63X70FTC. Verify your ISO 15552 FTC trunnion interface, 70 mm stroke, G3/8 port and M16x1.5 rod thread. Because this SKU lacks the -S magnet, it cannot support position sensing; if switches are needed, select an SAI63X70SFTC and use current AirTAC sensors. A plain cylinder drifts on air loss—the cushion only decelerates—so add an external rod lock or pilot check valve for held loads, or specify the SAIL/BSAI lock variant. If sizing up or down, the 80 mm bore yields 2513 N push, while the 50 mm bore yields 982 N at 0.5 MPa.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X70FTC
- ✓ 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 SI63X70FTC FAQ
Yes, the AirTAC SI63X70FTC is discontinued. The direct replacement is the SAI63X70FTC. It shares the identical ISO 15552 FTC trunnion mounting, 63 mm bore, 70 mm stroke, output force and G3/8 port, fitting existing fixtures perfectly.
The 63 mm bore uses a G3/8 air port. It delivers 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 SAI63X70FTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X70FTC replacement — usually within 7-8 hours.