This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX55S, 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 SI63AX55S
The AirTAC Airtac SI63 Standard Cylinder SI63AX55S 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 SAI63AX55S, 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 → SAI63AX55S
- 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 SI63AX55S
The AirTAC SI63AX55S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore, 55 mm stroke, G3/8 port and an SUS420J2 stainless steel rod. It delivers 1559 N push force at 0.5 MPa. The direct replacement is the SAI63AX55S, matching the interface, bore, stroke and port.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked.
Airtac SI63 Standard Cylinder SI63AX55S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX55S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX55S |
| 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 SAI63AX55S 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 SAI63AX55S 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 SI63AX55S
| 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 SI63AX55S Is Used
Stainless Rod Clamping
Uses the SUS420J2 rod to resist moisture while providing 1559 N of clamping thrust for mid-sized machining fixtures.
Short-Stroke Diversion
The 55 mm stroke rapidly actuates lane diverters or package stops, moving loads safely within the 935 N working range.
Vertical Lift Gates
Raises lightweight access gates or safety doors up to 79 kg, relying on the double-acting design for secure downward return.
Replacing the Airtac SI63 Standard Cylinder SI63AX55S with the SAI63AX55S
To replace the SI63AX55S, order the SAI63AX55S. Verify the ISO 15552 mounting dimensions, the G3/8 port, the M16x1.5 rod thread, the SUS420J2 rod and the -S magnet for CS1-B/DS1-B switches (the SAI uses 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). For load holding on air loss, note the cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX55S
- ✓ 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 SI63AX55S FAQ
Yes, the SI63AX55S is discontinued. The direct replacement is the SAI63AX55S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 55 mm stroke, G3/8 port and mounting interface.
It features a G3/8 air port. The force output is 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX55S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX55S replacement — usually within 7-8 hours.