This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X70S, 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 SI63X70S
The AirTAC Airtac SI63 Standard Cylinder SI63X70S 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 SAI63X70S, 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 → SAI63X70S
- 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 SI63X70S
The AirTAC SI63X70S 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. The direct replacement is the SAI63X70S, sharing the same interface, output, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SI -S magnet works with legacy CS1-B/DS1-B switches. For load holding, note the air cushion only decelerates; use SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63X70S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X70S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X70S |
| 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 SAI63X70S 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 SAI63X70S 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 SI63X70S
| 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 SI63X70S Is Used
Clamp Actuation
Provides 1559 N of push force at 0.5 MPa to secure medium-weight workpieces during machining operations.
Package Diversion
Uses the 70 mm stroke to push standard totes or cartons cleanly off a main conveyor line at high speed.
Pallet Stops
Acts as a robust pneumatic stop for pallets entering a workstation, absorbing kinetic energy via its cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X70S with the SAI63X70S
To replace the SI63X70S, order the SAI63X70S. Confirm the ISO 15552 mounting interface, 63 mm bore, 70 mm stroke, G3/8 port (PT/G/NPT), and the -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. If you need load holding on air loss, a plain cylinder drifts; specify the SAIL air-released lock, BSAI clamp-lock, or an external pilot check valve. For strokes over 300 mm, add a guide to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X70S
- ✓ 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 SI63X70S FAQ
Yes, the SI63X70S is discontinued. The direct replacement is the AirTAC SAI63X70S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 70 mm stroke, output force, G3/8 port, and mounting fixtures.
The G3/8 port feeds a 20 mm rod. Force output is 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 max of 318 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Request a Quote for the SAI63X70S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X70S replacement — usually within 7-8 hours.