This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X75S, 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 SI63X75S
The AirTAC Airtac SI63 Standard Cylinder SI63X75S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 75mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X75S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke75 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X75S
- 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 SI63X75S
The AirTAC SI63X75S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 75mm stroke, delivering 1559N push and 1402N pull at 0.5 MPa. It features a G3/8 port, M16x1.5 rod thread, and a built-in piston magnet for legacy CS1-B/DS1-B sensors. AirTAC replaced this unit with the SAI63X75S, a direct sharing the same interface, force, and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, note that a plain cylinder drifts on air loss; the cushion only decelerates. The SAI family also adds SAIL, SAIF, and BSAI lock variants.
Airtac SI63 Standard Cylinder SI63X75S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X75S |
| Bore size | Ø63 mm |
| Stroke | 75 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 SAI63X75S 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 SAI63X75S 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 SI63X75S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×75 | 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 SI63X75S Is Used
Mid-Tonnage Clamping
Secures heavy workpieces in machining fixtures using 1559N of push force at 0.5 MPa.
Package Diversion
Actuates routing gates on assembly lines with a snappy 75mm stroke and 30-800 mm/s speed.
Pallet Stops
Deploys robust 20mm rod stops to halt pallets, retracting quickly via the G3/8 air port.
Replacing the Airtac SI63 Standard Cylinder SI63X75S with the SAI63X75S
To replace the SI63X75S, order the SAI63X75S keeping the -S magnet and your mounting accessory (LB, FA, TC, etc.). Verify the G3/8 port and ISO 15552 dimensions to ensure it drops into existing fixtures. For sizing both ways: a 50mm bore yields 982N push, while an 80mm bore yields 2513N push at 0.5 MPa. If you need to hold a load vertically without live air, the cushion will not lock it; use an external pilot check valve or the SAIL/BSAI lock variant. The 75mm stroke avoids side-load rod-bending issues seen in longer travels.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X75S
- ✓ 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 SI63X75S FAQ
Yes, the SI63X75S is discontinued. The direct replacement is the AirTAC SAI63X75S. It shares the identical ISO 15552 mounting interface, 63mm bore, 75mm stroke, output force, G3/8 port, and accessories, fitting existing fixtures perfectly.
The 63mm bore uses a G3/8 port. Force output is 1559N push and 1402N pull at 0.5 MPa, 2182N push at 0.7 MPa, 2805N push at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa. The -S suffix indicates a piston magnet for CS1-B/DS1-B sensors.
Request a Quote for the SAI63X75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X75S replacement — usually within 7-8 hours.