This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX55, 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 SI63AX55
The AirTAC Airtac SI63 Standard Cylinder SI63AX55 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 55mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX55, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke55 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX55
- 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 SI63AX55
The AirTAC SI63AX55 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 55 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. Because this legacy unit is end-of-life, you should order the direct replacement SAI63AX55, which matches the exact mounting interface, bore, stroke, output force, and port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This specific SKU lacks a magnet (-S) and therefore cannot accept a CS1-B/DS1-B sensor.
Airtac SI63 Standard Cylinder SI63AX55 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX55 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX55 |
| Bore size | Ø63 mm |
| Stroke | 55 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 SAI63AX55 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 SAI63AX55 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 SI63AX55
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×55 | 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 SI63AX55 Is Used
Clamp Actuation
Provides reliable 1559 N clamping force for mid-sized machining fixtures, easily dropping into existing ISO 15552 mounting blocks.
Package Diverting
Drives 55 mm stroke diverting arms on packaging lines, moving products efficiently at operating speeds up to 800 mm/s.
Pallet Stops
Acts as a robust pneumatic stop for palletized goods, safely halting loads up to 79 kg in vertical lift scenarios.
Replacing the Airtac SI63 Standard Cylinder SI63AX55 with the SAI63AX55
To replace the SI63AX55, order the SAI63AX55. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC, etc.), the 63 mm bore, 55 mm stroke, and G3/8 port (PT/G/NPT thread options). This non-magnetic SKU cannot hold a position switch; if sensing is needed, select an SAI equivalent with the S suffix for current AirTAC switches. If sizing up or down, neighbouring 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 on air loss—the cushion only decelerates. For load holding, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. The -A rod option denotes SUS420J2 stainless steel for corrosion resistance.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX55
- ✓ 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 SI63AX55 FAQ
Yes, the AirTAC SI63AX55 is discontinued. The direct replacement is the SAI63AX55. It features the same ISO 15552 mounting interface, 63 mm bore, 55 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The 63 mm bore uses a G3/8 air port. Force output is 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.
Request a Quote for the SAI63AX55
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX55 replacement — usually within 7-8 hours.