This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X750STC, 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 SI63X750STC
The AirTAC SI63 Standard Cylinder SI63X750STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 750mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X750STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke750 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X750STC
- 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 SI63X750STC
The AirTAC SI63X750STC is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 750 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63X750STC, matching the exact ISO 15552 mounting interface, bore, stroke, force, and TC trunnion hardware.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. This -S model has a piston magnet for CS1-B/DS1-B sensors; the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X750STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X750STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X750STC |
| Bore size | Ø63 mm |
| Stroke | 750 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 SAI63X750STC 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 SAI63X750STC 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 SI63X750STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×750 | 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 SI63X750STC Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the full 750 mm travel, relying on the 1559 N thrust at 0.5 MPa to overcome friction.
Pallet Push-Off
Acts as a horizontal ejector for palletizing cells, utilizing the TC trunnion mount to accommodate slight alignment shifts.
Material Lowering
Lowers workpieces with a controlled descent, where the adjustable 30 mm air cushions absorb kinetic energy near stroke end.
Replacing the Airtac SI63 Standard Cylinder SI63X750STC with the SAI63X750STC
To replace the SI63X750STC, order the SAI63X750STC. Verify the ISO 15552 TC trunnion mounting, 63 mm bore, 750 mm stroke, G3/8 port, and the -S magnet. For sizing, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. 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 held loads. At 750 mm, prevent rod bending by supporting the load with external guides.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X750STC
- ✓ 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 SI63X750STC FAQ
Yes, the SI63X750STC is discontinued. The direct replacement is the SAI63X750STC. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 750 mm stroke, G3/8 port, and TC mounting interface.
The G3/8 port bore 63 mm cylinder provides 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X750STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X750STC replacement — usually within 7-8 hours.