This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X140STC, 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 SI63X140STC
The AirTAC Airtac SI63 Standard Cylinder SI63X140STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 140mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X140STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke140 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X140STC
- 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 SI63X140STC
The AirTAC SI63X140STC is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 140 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. AirTAC replaced this unit with the SAI63X140STC, a direct sharing the same ISO 15552 mounting interface, bore, stroke, output force, and TC trunnion mount.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock and self-valve variants (SAIL, SAIF, BSAI) absent in the legacy SI line.
Airtac SI63 Standard Cylinder SI63X140STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X140STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X140STC |
| Bore size | Ø63 mm |
| Stroke | 140 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 SAI63X140STC 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 SAI63X140STC 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 SI63X140STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×140 | 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 SI63X140STC Is Used
Clamp Actuation
Ideal for holding medium-weight workpieces during machining, using its 1559 N push force to secure parts firmly against fixtures.
Package Diversion
Provides reliable 140 mm stroke movements to push cartons or totes between adjacent conveyor lanes in material handling lines.
Pallet Stop Gate
Functions as a robust pneumatic stop gate for pallets up to 79 kg, utilizing the TC trunnion mount to handle lateral loads.
Replacing the Airtac SI63 Standard Cylinder SI63X140STC with the SAI63X140STC
To replace the SI63X140STC, order the SAI63X140STC. Verify your ISO 15552 TC trunnion mounting interface, 63 mm bore, 140 mm stroke, G3/8 port, and the -S magnet for CS1-B/DS1-B sensors. If you need more force, the 80 mm bore yields 2513 N push at 0.5 MPa; if less is required, the 50 mm bore provides 982 N. Remember that a standard cylinder drifts on air loss—the cushion only decelerates near stroke end—so for load holding consider an external pilot check valve or the SAIL/BSAI lock variants. At 140 mm stroke, side-load is minimal, but always ensure proper guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X140STC
- ✓ 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 SI63X140STC FAQ
Yes, the SI63X140STC is discontinued. The direct replacement is the SAI63X140STC. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 63 mm bore, 140 mm stroke, output force, G3/8 port, and TC mounting.
This 63 mm bore cylinder uses a G3/8 air port. The thrust ratings are: 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X140STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X140STC replacement — usually within 7-8 hours.