This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX275, 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 SI63AX275
The AirTAC Airtac SI63 Standard Cylinder SI63AX275 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 SAI63AX275, 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 → SAI63AX275
- 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 SI63AX275
The AirTAC SI63AX275 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 275mm stroke. This specific SKU features a SUS420J2 stainless piston rod (-A) for corrosion resistance and uses a G3/8 air port. Because it lacks a magnet (-S), it cannot accept position sensors.
AirTAC replaced the SI line with the SAI63AX275 direct upgrade. It shares the exact ISO 15552 mounting interface, bore, stroke, force, port, and M16x1.5 rod thread, fitting existing fixtures perfectly. 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 SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI63 Standard Cylinder SI63AX275 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX275 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX275 |
| 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 SAI63AX275 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 SAI63AX275 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 SI63AX275
| 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 SI63AX275 Is Used
Stainless Rod Clamping
Ideal for packaging lines where moisture is present, utilizing the SUS420J2 rod to resist corrosion while providing 1559N of clamping thrust.
Mid-Stroke Diverting
Handles product diverting on conveyors with a 275mm stroke, moving loads safely under the 935N working load limit at 0.5MPa.
Replacing the Airtac SI63 Standard Cylinder SI63AX275 with the SAI63AX275
To replace this discontinued SI63AX275, order the SAI63AX275. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the 275mm stroke, and the G3/8 port. This unit has the -A SUS420J2 stainless rod but no -S magnet, so it cannot support switches; if sensing is needed, select an SAI model with the S suffix for current AirTAC switches. At 0.5MPa the 63mm bore pushes 1559N; if undersized, the neighbouring 80mm bore provides 2513N. Since the 275mm stroke exceeds 300mm only slightly, ensure adequate guide support to prevent rod bending under 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 → SAI63AX275
- ✓ 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 SI63AX275 FAQ
Yes, the SI63AX275 is discontinued. The direct replacement is the SAI63AX275. It shares the identical ISO 15552 mounting interface, 63mm bore, 275mm stroke, G3/8 port, and M16x1.5 rod thread, fitting directly into your existing fixtures.
This 63mm bore cylinder uses a G3/8 air port. The force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX275
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX275 replacement — usually within 7-8 hours.