This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X70SCA, 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 SI63X70SCA
The AirTAC Airtac SI63 Standard Cylinder SI63X70SCA 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 SAI63X70SCA, 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 → SAI63X70SCA
- 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 SI63X70SCA
The AirTAC SI63X70SCA is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 70 mm stroke, delivering 1559 N push force at 0.5 MPa via its G3/8 port. AirTAC replaced this legacy unit with the SAI63X70SCA, a direct sharing the exact same mounting interface, bore, stroke, output force, and CA clevis accessory.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The original -S magnet supports CS1-B/DS1-B switches, while the SAI family also introduces SAIL and BSAI lock variants absent in the SI line.
Airtac SI63 Standard Cylinder SI63X70SCA Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X70SCA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X70SCA |
| 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 SAI63X70SCA 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 SAI63X70SCA 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 SI63X70SCA
| 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 SI63X70SCA Is Used
Clamp Actuation
Drives mid-tonnage workholding clamps on machining fixtures, utilizing the 1559 N push force to secure heavy metal parts during milling.
Replacing the Airtac SI63 Standard Cylinder SI63X70SCA with the SAI63X70SCA
To replace the SI63X70SCA, order the SAI63X70SCA and verify your ISO 15552 interface, 63 mm bore, 70 mm stroke, G3/8 port (PT/G/NPT thread), CA clevis mounting, and -S magnet for current AirTAC switches. Sizing both ways: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. Remember that a standard cylinder drifts without live air, as the cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X70SCA
- ✓ 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 SI63X70SCA FAQ
Yes, the SI63X70SCA is discontinued. The direct replacement is the SAI63X70SCA, which shares the identical ISO 15552 mounting interface, 63 mm bore, 70 mm stroke, output force, and G3/8 port for a seamless fixture swap.
The 63 mm bore features a G3/8 port and delivers 1559 N push / 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X70SCA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X70SCA replacement — usually within 7-8 hours.