This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X273S, 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 SI63X273S
The AirTAC SI63 Standard Cylinder SI63X273S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 273mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X273S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke273 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X273S
- 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 SI63X273S
The AirTAC SI63X273S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 273mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X273S, a direct sharing the same interface, bore, stroke, force, port and mounting. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The SAI family also introduces lock and valve variants absent in the SI line, including the SAIL air-released lock, SAIF built-in valve, and BSAI clamp-lock. Your SI63X273S includes a piston magnet for CS1-B/DS1-B sensors, while the SAI replacement uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X273S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X273S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X273S |
| Bore size | Ø63 mm |
| Stroke | 273 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 SAI63X273S 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 SAI63X273S 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 SI63X273S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×273 | 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 SI63X273S Is Used
Clamping Fixtures
Holds workpieces securely in machining jigs with 1559 N of thrust at 0.5 MPa, utilizing the adjustable cushion for smooth end-of-stroke contact.
Package Diversion
Actuates routing gates on 50-80 kg assembly lines, where the 273mm stroke provides the reach needed to redirect products between belts.
Replacing the Airtac SI63 Standard Cylinder SI63X273S with the SAI63X273S
To replace the discontinued SI63X273S, order the SAI63X273S. Confirm the ISO 15552 mounting interface, 63mm bore, 273mm stroke, G3/8 port (PT/G/NPT thread), and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet is retained. If sizing up or down, neighbouring bores are 50mm (982 N push @0.5 MPa) and 80mm (2513 N push @0.5 MPa). Because this stroke is 273mm, ensure adequate guide support to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X273S
- ✓ 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 SI63X273S FAQ
Yes, the SI63X273S is discontinued. The direct replacement is the SAI63X273S. It shares the identical ISO 15552 mounting interface, 63mm bore, 273mm stroke, output force, G3/8 port, and mounting accessories, fitting directly into existing fixtures.
The 63mm bore uses a G3/8 air port and a 20mm 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 maximum of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X273S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X273S replacement — usually within 7-8 hours.