This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX210S, 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 SI63AX210S
The AirTAC Airtac SI63 Standard Cylinder SI63AX210S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 210mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX210S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke210 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX210S
- 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 SI63AX210S
The AirTAC SI63AX210S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore, 210mm stroke, and a SUS420J2 stainless steel rod. It delivers 1559N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63AX210S, matching the bore, stroke, force, port, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. Note that 210mm is a nonstandard stroke.
Airtac SI63 Standard Cylinder SI63AX210S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX210S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX210S |
| Bore size | Ø63 mm |
| Stroke | 210 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 SAI63AX210S 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 SAI63AX210S 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 SI63AX210S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×210 | 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 SI63AX210S Is Used
Stainless Rod Actuation
Ideal for packaging machinery where the SUS420J2 stainless piston rod resists moisture and corrosion during repetitive clamping cycles.
Mid-Stroke Diverting
Provides robust 1559N push force at 0.5 MPa to divert heavier product loads on material handling lines using the 210mm travel.
Replacing the Airtac SI63 Standard Cylinder SI63AX210S with the SAI63AX210S
To replace the SI63AX210S, order the SAI63AX210S. Confirm the ISO 15552 mounting interface, 63mm bore, 210mm nonstandard stroke, G3/8 port, and the -A SUS420J2 stainless rod option. The -S magnet enables position sensing; use current AirTAC switches for the SAI. A plain cylinder drifts on air loss, so for load holding use an external pilot check valve or the SAIL/BSAI lock variant. If sizing up or down, a 50mm bore yields 982N push at 0.5 MPa, while an 80mm bore yields 2513N. Since the 210mm stroke exceeds 200mm, ensure adequate guide support to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX210S
- ✓ 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 SI63AX210S FAQ
Yes, the SI63AX210S is discontinued. The direct replacement is the SAI63AX210S. It features the same ISO 15552 mounting interface, 63mm bore, 210mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
This 63mm bore cylinder uses a G3/8 air port. It generates 1559N push and 1402N pull at 0.5 MPa, 2182N push at 0.7 MPa, 2805N push at 0.9 MPa, and a theoretical maximum force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX210S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX210S replacement — usually within 7-8 hours.