This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X276S, 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 SI63X276S
The AirTAC Airtac SI63 Standard Cylinder SI63X276S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 276mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X276S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke276 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X276S
- 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 SI63X276S
The AirTAC SI63X276S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 276mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X276S, a direct upgrade retaining the exact mounting interface, bore, stroke, output force, and port size.
The SAI upgrade features a modernized piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock and valve variants like the SAIL and BSAI that the original SI line lacked, while this -S model retains its magnetic piston for legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X276S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X276S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X276S |
| Bore size | Ø63 mm |
| Stroke | 276 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 SAI63X276S 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 SAI63X276S 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 SI63X276S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×276 | 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 SI63X276S Is Used
Package Diversion
Actuates routing gates on packaging lines where 1559N push force at 0.5MPa easily redirects heavy cartons.
Pallet Stops
Controls pallet flow on accumulation conveyors, using the adjustable 30mm air cushions to decelerate loads smoothly.
Replacing the Airtac SI63 Standard Cylinder SI63X276S with the SAI63X276S
To replace the SI63X276S, order the SAI63X276S and confirm the ISO 15552 mounting interface, 63mm bore, 276mm stroke, G3/8 port, and your specific mounting accessory. The -S suffix indicates a magnetic piston for CS1-B/DS1-B switches, which the SAI replaces with current AirTAC sensors. If you need to size both ways, the neighboring 80mm bore yields 2513N push at 0.5MPa, while the 50mm bore yields 982N. Because this 276mm stroke exceeds 300mm only marginally, ensure your guide mechanism handles side loads to prevent rod bending. A plain cylinder does not hold load without live air; the cushion only decelerates. For load holding, use the SAIL lock, BSAI clamp-lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X276S
- ✓ 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 SI63X276S FAQ
Yes, the SI63X276S is discontinued. The direct replacement is the AirTAC SAI63X276S. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 276mm stroke, output force, G3/8 port, and mounting interface. You simply order the SAI equivalent.
The 63mm bore features a G3/8 air port and a 20mm rod. It delivers 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, and a theoretical maximum of 318kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X276S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X276S replacement — usually within 7-8 hours.