This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX20, 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 SI63AX20
The AirTAC Airtac SI63 Standard Cylinder SI63AX20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 20mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke20 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX20
- 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 SI63AX20
The AirTAC SI63AX20 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 20 mm stroke. It delivers a thrust of 1559 N at 0.5 MPa via its G3/8 port. Because this legacy unit is end-of-life, you should order the direct replacement: the SAI63AX20. It shares the same ISO 15552 mounting interface, bore, stroke, force, port and mounting accessories, fitting existing fixtures perfectly.
The SAI upgrade introduces a refined piston seal featuring two Y-shaped one-way elements for extended life and low start-up pressure. This specific SKU lacks a magnet (-S), meaning it cannot accept a CS1-B/DS1-B sensor. For load holding, note that a standard cylinder drifts without live air; use a SAIL lock variant or external pilot check valve.
Airtac SI63 Standard Cylinder SI63AX20 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX20 |
| Bore size | Ø63 mm |
| Stroke | 20 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 SAI63AX20 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 SAI63AX20 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 SI63AX20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×20 | 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 SI63AX20 Is Used
Short-Stroke Clamping
Ideal for holding parts during machining operations where a compact 20 mm stroke and 1559 N force securely position workpieces.
Transfer Diversion
Provides robust actuation for diverting packages on a production line, utilizing the 63 mm bore for reliable mid-level push force.
Gate Ejection
Suitable for ejecting finished components from machinery, offering fast 30-800 mm/s cycling within tight spatial constraints.
Replacing the Airtac SI63 Standard Cylinder SI63AX20 with the SAI63AX20
To replace the discontinued SI63AX20, order the SAI63AX20, confirming the ISO 15552 mounting interface, 63 mm bore, 20 mm stroke, G3/8 port (PT/G/NPT thread), and M16x1.5 rod thread. This non-magnetic SKU cannot support a switch; if sensing is needed, select an SAI model with the -S magnet option to use current AirTAC switches. When sizing, consider neighbouring bores: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Remember, a plain cylinder does not hold load without live air—the cushion only decelerates. For secure holding, explore the SAIL (air-released lock) or BSAI (clamp-lock) variants, or use an external rod lock. The -A rod designation indicates a SUS420J2 stainless steel piston rod for corrosion resistance.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX20
- ✓ 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 SI63AX20 FAQ
Yes, the SI63AX20 is discontinued. The direct replacement is the AirTAC SAI63AX20. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 20 mm stroke, output force, G3/8 port, and mounting interface.
This double-acting cylinder features a G3/8 air port. It delivers a push force of 1559 N and a pull force of 1402 N at 0.5 MPa. At 0.7 MPa, the push force is 2182 N, and at 0.9 MPa it is 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa.
Request a Quote for the SAI63AX20
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX20 replacement — usually within 7-8 hours.