This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX85S, 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 SI63AX85S
The AirTAC SI63 Standard Cylinder SI63AX85S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 85mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX85S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke85 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX85S
- 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 SI63AX85S
The AirTAC SI63AX85S is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel. It delivers 1559 N push force at 0.5 MPa through its 63 mm bore and G3/8 port. The direct replacement is the SAI63AX85S, sharing the same ISO 15552 mounting interface, stroke, and output force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This specific unit includes the -A SUS420J2 stainless piston rod for corrosion resistance and the -S magnet for legacy CS1-B/DS1-B sensors.
Airtac SI63 Standard Cylinder SI63AX85S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX85S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX85S |
| Bore size | Ø63 mm |
| Stroke | 85 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 SAI63AX85S 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 SAI63AX85S 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 SI63AX85S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×85 | 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 SI63AX85S Is Used
Mid-Tonnage Clamping
Secures heavy workpieces during machining operations, utilizing the 1559 N push force at 0.5 MPa to hold parts rigidly against cutting forces.
Pallet Diversion
Actuates routing gates or stops on automated conveyor lines, where the 1402 N pull force at 0.5 MPa easily overcomes pallet inertia.
Replacing the Airtac SI63 Standard Cylinder SI63AX85S with the SAI63AX85S
To replace the SI63AX85S, order the SAI63AX85S and confirm the ISO 15552 mounting interface, 85 mm stroke, G3/8 port, and M16x1.5 rod thread. The SAI family also adds SAIL, SAIF, and BSAI lock or valve variants the SI lacked. If sizing up or down, neighboring bores are 50 mm (982 N push @0.5 MPa) and 80 mm (2513 N push @0.5 MPa). Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX85S
- ✓ 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 SI63AX85S FAQ
Yes, the SI63AX85S is discontinued. The direct replacement is the SAI63AX85S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 85 mm stroke, G3/8 port, and mounting accessories.
This 63 mm bore cylinder features a G3/8 air port and M16x1.5 rod thread. It delivers 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 SAI63AX85S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX85S replacement — usually within 7-8 hours.