This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X275S, 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 SI63X275S
The AirTAC Airtac SI63 Standard Cylinder SI63X275S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 275mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X275S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke275 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X275S
- 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 SI63X275S
The AirTAC SI63X275S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 275mm stroke. Delivering 1559 N push force at 0.5 MPa via a G3/8 port, it is directly replaced by the SAI63X275S. This direct upgrade shares identical ISO 15552 mounting dimensions, bore, stroke, and output force, fitting existing fixtures perfectly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SI-S includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants the original SI lacked.
Airtac SI63 Standard Cylinder SI63X275S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X275S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X275S |
| Bore size | Ø63 mm |
| Stroke | 275 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 SAI63X275S 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 SAI63X275S 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 SI63X275S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×275 | 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 SI63X275S Is Used
Clamp Actuation
Provides reliable clamping force in machining fixtures, utilizing the 1559 N push force at 0.5 MPa.
Pallet Lift Gates
Raises and lowers access gates on pallet conveyors, benefiting from the 275mm stroke length.
Replacing the Airtac SI63 Standard Cylinder SI63X275S with the SAI63X275S
To replace the discontinued SI63X275S, order the SAI63X275S: it matches the 63mm bore, 275mm stroke, G3/8 port, M16x1.5 rod thread, and ISO 15552 mounting interface. Confirm your thread standard (PT, G, or NPT) and mounting accessory (LB, FA, TC, etc.). The -S magnet supports CS1-B/DS1-B switches, while the SAI uses current AirTAC sensors. For sizing, a 50mm bore yields 982 N push at 0.5 MPa, whereas an 80mm bore yields 2513 N; step up if moving heavier loads. Because stroke is 275mm, ensure adequate guide support to prevent rod bending and side loads. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X275S
- ✓ 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 SI63X275S FAQ
Yes, the SI63X275S is discontinued. The direct replacement is the SAI63X275S. It shares the same ISO 15552 mounting interface, 63mm bore, 275mm stroke, output force, and G3/8 port, dropping directly into existing fixtures.
The 63mm bore features a G3/8 port and provides 1559 N push / 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X275S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X275S replacement — usually within 7-8 hours.