This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X640STC, 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 SI63X640STC
The AirTAC Airtac SI63 Standard Cylinder SI63X640STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 640mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X640STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke640 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X640STC
- 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 SI63X640STC
The AirTAC SI63X640STC is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore, 640 mm stroke, and G3/8 port, delivering 1559 N of push force at 0.5 MPa. AirTAC replaced this end-of-life unit with the SAI63X640STC. The SAI is a direct upgrade: identical ISO 15552 mounting interface, bore, stroke, output force, and TC trunnion mount, fitting existing fixtures perfectly.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The original SI line lacked integrated lock options, but the SAI family adds SAIL, SAIF, and BSAI variants.
Airtac SI63 Standard Cylinder SI63X640STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X640STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X640STC |
| Bore size | Ø63 mm |
| Stroke | 640 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 SAI63X640STC 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 SAI63X640STC 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 SI63X640STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×640 | 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 SI63X640STC Is Used
Long-Stroke Diversion
Ideal for pushing heavy pallets or workpieces across a 640 mm gap on assembly lines using the TC trunnion mount to accommodate slight alignment shifts.
Vertical Material Lift
With a safe vertical lift capacity of roughly 79 kg at 0.5 MPa, this cylinder excels in raising and lowering goods between elevation tiers.
Automated Pressing
Provides consistent 1559 N pressing force for seating bearings or components, with adjustable end cushions to decelerate the load smoothly.
Replacing the Airtac SI63 Standard Cylinder SI63X640STC with the SAI63X640STC
To replace the SI63X640STC, order the SAI63X640STC. Confirm the ISO 15552 TC trunnion mounting, 63 mm bore, 640 mm stroke, G3/8 port (PT/G/NPT thread options), and the -S magnet for position sensing. The SAI accepts current AirTAC switches, while the legacy SI used CS1-B/DS1-B sensors. If sizing up or down, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Because the 640 mm stroke is long, use an external guide to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X640STC
- ✓ 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 SI63X640STC FAQ
Yes, the SI63X640STC is discontinued. The direct replacement is the SAI63X640STC. It features the same ISO 15552 mounting interface, 63 mm bore, 640 mm stroke, output force, G3/8 port, and TC trunnion mount, fitting directly into existing fixtures.
It has a G3/8 air port. The force 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 SAI63X640STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X640STC replacement — usually within 7-8 hours.