This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X265, 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 SI63X265
The AirTAC Airtac SI63 Standard Cylinder SI63X265 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 265mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X265, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke265 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X265
- 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 SI63X265
The AirTAC SI63X265 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 265 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63X265, which shares the exact same mounting interface, output force, and dimensions.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this non-magnet SKU cannot accept a sensor; legacy CS1-B/DS1-B switches require an -S model. For high heat, Viton H seals raise the temperature limit to 150 C.
Airtac SI63 Standard Cylinder SI63X265 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X265 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X265 |
| Bore size | Ø63 mm |
| Stroke | 265 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 SAI63X265 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 SAI63X265 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 SI63X265
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×265 | 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 SI63X265 Is Used
Package Diversion
Actuates routing gates on packaging lines where 1559 N push force at 0.5 MPa easily redirects heavy cartons.
Clamp Actuation
Drives medium-duty workholding clamps on machining fixtures, utilizing the 30 mm adjustable cushion for smooth stops.
Pallet Stops
Raises and lowers stop mechanisms at roller conveyor ends, securely halting pallets up to the 79 kg vertical lift threshold.
Replacing the Airtac SI63 Standard Cylinder SI63X265 with the SAI63X265
To replace the SI63X265, order the SAI63X265 and verify your ISO 15552 mounting fixture, G3/8 port, and M16x1.5 rod thread. Because this SKU lacks the -S magnet, it cannot support position sensing; switch to an SAI63X265S if you need CS1-B or current AirTAC switches. At 265 mm stroke, guide the load to prevent rod bending and side-load wear. If you need more force, the 80 mm bore yields 2513 N push at 0.5 MPa; if less is acceptable, the 50 mm bore provides 982 N. A plain cylinder drifts on air loss, so for load holding use the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X265
- ✓ 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 SI63X265 FAQ
Yes, the SI63X265 is discontinued. The direct replacement is the SAI63X265. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 265 mm stroke, G3/8 port, and mounting interface.
The 63 mm bore uses a G3/8 port. It generates 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.
Request a Quote for the SAI63X265
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X265 replacement — usually within 7-8 hours.