This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX270S, 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 SI63AX270S
The AirTAC Airtac SI63 Standard Cylinder SI63AX270S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 270mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX270S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke270 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX270S
- 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 SI63AX270S
The AirTAC SI63AX270S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 270mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63AX270S, matching the bore, stroke, force, port, and ISO 15552 mounting interface exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked. This -A model has a SUS420J2 stainless rod, while the -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63AX270S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX270S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX270S |
| Bore size | Ø63 mm |
| Stroke | 270 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 SAI63AX270S 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 SAI63AX270S 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 SI63AX270S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×270 | 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 SI63AX270S Is Used
Mid-Tonnage Pressing
Applies the 1559N push force at 0.5MPa for seating bearings and assembling bushings in automated machining cells.
Package Diversion
Uses the 270mm stroke and SUS420J2 stainless rod to push cartons reliably across transfer lines in humid environments.
Replacing the Airtac SI63 Standard Cylinder SI63AX270S with the SAI63AX270S
To replace the SI63AX270S, order the SAI63AX270S and confirm the ISO 15552 interface, 63mm bore, 270mm stroke, G3/8 port, and mounting accessory. The -A suffix specifies the SUS420J2 stainless rod, and -S means it has a piston magnet for CS1-B/DS1-B switches. When sizing both ways, a 50mm bore yields 982N push at 0.5MPa, whereas an 80mm bore yields 2513N. For this 270mm stroke, ensure guide alignment to prevent rod bending and side-load wear. A plain cylinder does not hold load without live air; for load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX270S
- ✓ 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 SI63AX270S FAQ
Yes, the AirTAC SI63AX270S is discontinued. The direct replacement is the SAI63AX270S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 270mm stroke, output force, G3/8 port, and mounting interface.
This double-acting cylinder uses a G3/8 port and generates 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa. The speed range is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX270S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX270S replacement — usually within 7-8 hours.