This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X40S, 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 SI63X40S
The AirTAC Airtac SI63 Standard Cylinder SI63X40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 40mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke40 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X40S
- 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 SI63X40S
The AirTAC SI63X40S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 40mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa, using a G3/8 port and M16x1.5 rod thread. AirTAC replaced this legacy unit with the SAI63X40S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, force, and port.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family also introduces SAIL lock, SAIF valve, and BSAI clamp-lock variants absent in the original SI line.
Airtac SI63 Standard Cylinder SI63X40S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X40S |
| Bore size | Ø63 mm |
| Stroke | 40 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 SAI63X40S 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 SAI63X40S 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 SI63X40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×40 | 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 SI63X40S Is Used
Mid-Tonnage Clamping
Secures heavy workpieces during machining with 1559N of push force at 0.5MPa, ensuring rigid holding without fixture deflection.
Package Diverting
Short 40mm stroke actuates diverter arms swiftly at 30-800mm/s to redirect goods on high-speed packaging lines.
Pallet Stopping
Deploys a robust 20mm rod to halt loaded pallets on roller conveyors, absorbing kinetic energy via adjustable air cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X40S with the SAI63X40S
To replace the SI63X40S, order the SAI63X40S direct, confirming the ISO 15552 mounting interface, 63mm bore, 40mm stroke, G3/8 port (PT/G/NPT thread), and the -S magnet for current AirTAC switches. When sizing, a 50mm bore yields 982N push at 0.5MPa, whereas an 80mm bore provides 2513N; this 63mm bore hits 2182N at 0.7MPa. A plain cylinder drifts on air loss since cushions only decelerate, so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads. Rod material options include carbon steel, SUS420J2, and SUS304.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X40S
- ✓ 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 SI63X40S FAQ
Yes, the SI63X40S is discontinued. The direct replacement is the AirTAC SAI63X40S. It shares the identical ISO 15552 mounting interface, 63mm bore, 40mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The 63mm bore features a G3/8 port and provides 1559N push / 1402N pull at 0.5MPa, 2182N push at 0.7MPa, and a theoretical maximum of 318kgf at 1.0MPa. It uses a 20mm rod with an M16x1.5 thread.
Request a Quote for the SAI63X40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X40S replacement — usually within 7-8 hours.