This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X350STC, 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 SI63X350STC
The AirTAC Airtac SI63 Standard Cylinder SI63X350STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 350mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X350STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke350 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X350STC
- 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 SI63X350STC
The AirTAC SI63X350STC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 350mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63X350STC, which retains the same interface, force, and TC trunnion mount.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked. This -S model uses CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63X350STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X350STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X350STC |
| Bore size | Ø63 mm |
| Stroke | 350 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 SAI63X350STC 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 SAI63X350STC 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 SI63X350STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×350 | 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 SI63X350STC Is Used
Pallet Diversion
Actuates routing gates on conveyor lines using the TC trunnion mount to accommodate angular alignment during long 350mm strokes.
Vertical Material Lift
Raises tier-two product totes, handling the 79kg vertical lift capacity safely within the 63mm bore's 1559N thrust limit.
Component Ejection
Pushes machined parts out of a fixture, relying on the adjustable 30mm air cushions to decelerate the load at stroke end.
Replacing the Airtac SI63 Standard Cylinder SI63X350STC with the SAI63X350STC
To replace the SI63X350STC, order the SAI63X350STC. Verify the ISO 15552 TC trunnion mounting, 350mm stroke, G3/8 port, and the -S magnet for sensors. At 0.5MPa it yields 1559N push and 1402N pull; if undersized, the neighbouring 80mm bore offers 2513N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use a SAIL lock or external pilot check valve for load holding. With a 350mm stroke, use an external guide to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X350STC
- ✓ 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 SI63X350STC FAQ
Yes, the AirTAC SI63X350STC is discontinued. The direct replacement is the SAI63X350STC. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the same 63mm bore, 350mm stroke, G3/8 port, and TC trunnion mount.
The G3/8 port feeds the 20mm rod. At 0.5MPa it provides 1559N push and 1402N pull force. This rises to 2182N push at 0.7MPa and 2805N at 0.9MPa, with a theoretical max of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X350STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X350STC replacement — usually within 7-8 hours.