This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX350, 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 SI63AX350
The AirTAC SI63 Standard Cylinder SI63AX350 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 SAI63AX350, 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 → SAI63AX350
- 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 SI63AX350
The AirTAC SI63AX350 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. AirTAC replaced this unit with the SAI63AX350, a direct sharing the same ISO 15552 mounting interface, force, and dimensions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked. This SKU has no magnet, so it cannot take a switch. The SUS420J2 stainless rod resists corrosion.
Airtac SI63 Standard Cylinder SI63AX350 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX350 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX350 |
| 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 SAI63AX350 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 SAI63AX350 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 SI63AX350
| 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 SI63AX350 Is Used
Transfer Line Diverters
Drives diverter arms on packaging conveyors where 1559N push at 0.5MPa easily overcomes carton friction. The 350mm stroke spans wider belts, but external guides prevent rod bending.
Vertical Material Lifts
Lowers light tooling or platens. Use a pilot check valve to prevent drifting down when air is lost.
Stainless Rod Clamping
The SUS420J2 stainless rod suits humid or mildly corrosive clamping stations. The 30mm adjustable cushions decelerate the 30-800mm/s speed smoothly at both ends.
Replacing the Airtac SI63 Standard Cylinder SI63AX350 with the SAI63AX350
To replace the SI63AX350, order the SAI63AX350. Verify the ISO 15552 mounting interface, 350mm stroke, G3/8 port, and M16x1.5 thread. This SKU lacks a magnet and cannot accept a CS1-B/DS1-B sensor; order a -S version if sensing is needed. For loads needing holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant, as cushions only decelerate. At 350mm, use external guides to prevent rod bending. Neighbouring bores: 50mm gives 982N push @0.5MPa; 80mm gives 2513N push @0.5MPa.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX350
- ✓ 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 SI63AX350 FAQ
Yes, the SI63AX350 is discontinued. The direct replacement is the SAI63AX350. It shares the same ISO 15552 mounting interface, 63mm bore, 350mm stroke, G3/8 port, and output force, fitting existing fixtures perfectly.
The G3/8 port feeds a 63mm bore yielding 1559N push and 1402N pull at 0.5MPa. At 0.7MPa push is 2182N, and at 0.9MPa it is 2805N. The theoretical maximum force is 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX350
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX350 replacement — usually within 7-8 hours.