This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X245S, 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 SI63X245S
The AirTAC Airtac SI63 Standard Cylinder SI63X245S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 245mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X245S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke245 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X245S
- 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 SI63X245S
The AirTAC SI63X245S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 245 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63X245S, matching the bore, stroke, force, port and ISO 15552 mounting interface for a seamless fixture swap.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SI -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. SAIL lock, SAIF valve and BSAI clamp-lock variants expand the family.
Airtac SI63 Standard Cylinder SI63X245S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X245S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X245S |
| Bore size | Ø63 mm |
| Stroke | 245 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 SAI63X245S 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 SAI63X245S 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 SI63X245S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×245 | 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 SI63X245S Is Used
Clamp Actuation
Provides 1559 N of secure clamping force at 0.5 MPa for holding medium-weight machined parts during milling or drilling operations.
Package Diversion
Drives a 245 mm stroke diverting arm to push medium cartons off a main conveyor line into secondary packaging lanes.
Pallet Positioning
Shifts empty pallets into exact loading coordinates using a robust 63 mm bore profile cylinder and adjustable end cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X245S with the SAI63X245S
To replace the SI63X245S, order the SAI63X245S. Verify the ISO 15552 mounting interface, 63 mm bore, 245 mm stroke, G3/8 port (PT/G/NPT thread options) and the -S magnet requirement. For sizing, the 63 mm bore yields 1559 N push at 0.5 MPa; dropping to a 50 mm bore gives 982 N, while an 80 mm bore provides 2513 N. A plain cylinder drifts on air loss because the cushion only decelerates; for load holding, specify an external pilot check valve, rod lock, or the SAIL/BSAI lock variant. At 245 mm stroke, rod bending is low, but always guide the load to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X245S
- ✓ 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 SI63X245S FAQ
Yes, the SI63X245S is discontinued. The direct replacement is the SAI63X245S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 245 mm stroke, G3/8 port and mounting interface.
The 63 mm bore features a G3/8 port and generates 1559 N push / 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa. It operates at speeds of 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X245S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X245S replacement — usually within 7-8 hours.