This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X70STC, 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 SI63X70STC
The AirTAC Airtac SI63 Standard Cylinder SI63X70STC 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 SAI63X70STC, 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 → SAI63X70STC
- 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 SI63X70STC
The AirTAC SI63X70STC is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel and a 70 mm stroke. Delivering 1559 N of push force at 0.5 MPa, it is replaced by the SAI63X70STC. This direct upgrade retains the exact bore, port size, and TC trunnion mounting interface for seamless fixture integration.
The SAI replacement incorporates an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The original SI features a piston magnet for CS1-B/DS1-B switches, while the SAI family also introduces SAIL and BSAI lock variants absent in the legacy line.
Airtac SI63 Standard Cylinder SI63X70STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X70STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X70STC |
| 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 SAI63X70STC 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 SAI63X70STC 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 SI63X70STC
| 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 SI63X70STC Is Used
Mid-Tonnage Clamping
Ideal for securing heavy workpieces during machining, utilizing the 1559 N push force to maintain rigid positioning under dynamic loads.
Material Diversion
Drives TC-mounted diverter arms on packaging lines, providing reliable 70 mm stroke actuation to route products at high speeds.
Pallet Lift Gates
Actuates safety gates and lifting mechanisms in logistics hubs, where the 79 kg vertical lift capacity handles moderate gate weights smoothly.
Replacing the Airtac SI63 Standard Cylinder SI63X70STC with the SAI63X70STC
To replace the SI63X70STC, order the SAI63X70STC and verify the ISO 15552 mounting dimensions, 63 mm bore, 70 mm stroke, G3/8 port, and TC trunnion accessory. The -S suffix indicates a piston magnet, so confirm your sensor setup; the legacy CS1-B/DS1-B switches are superseded by current AirTAC switches on the SAI. For sizing, neighboring bores (50 mm or 80 mm) offer 982 N or 2513 N at 0.5 MPa respectively. A plain cylinder drifts on air loss, so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The SAIF variant with a built-in 4M valve is also available for bores up to 100 mm.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X70STC
- ✓ 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 SI63X70STC FAQ
Yes, the AirTAC SI63X70STC is discontinued. The direct replacement is the SAI63X70STC. It shares the identical ISO 15552 mounting interface, 63 mm bore, 70 mm stroke, output force, G3/8 port, and TC trunnion mount, fitting existing fixtures perfectly.
This double-acting cylinder features a G3/8 air port and a 20 mm piston rod. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and 2805 N push at 0.9 MPa. The theoretical maximum force is 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X70STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X70STC replacement — usually within 7-8 hours.