This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX155S, 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 SI63AX155S
The AirTAC Airtac SI63 Standard Cylinder SI63AX155S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 155mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX155S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke155 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX155S
- 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 SI63AX155S
The AirTAC SI63AX155S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 155mm stroke, and a SUS420J2 stainless piston rod. Delivering 1559 N push force at 0.5 MPa via a G3/8 port, it is directly replaced by the SAI63AX155S. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, and output force, fitting existing fixtures perfectly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants absent from the SI line.
Airtac SI63 Standard Cylinder SI63AX155S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX155S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX155S |
| Bore size | Ø63 mm |
| Stroke | 155 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 SAI63AX155S 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 SAI63AX155S 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 SI63AX155S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×155 | 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 SI63AX155S Is Used
Stainless Rod Clamping
Ideal for machining fixtures requiring corrosion resistance, using the SUS420J2 rod to clamp parts securely with 1559 N of push force.
Material Diversion
Provides robust 63mm bore actuation for diverting moderate loads on packaging lines, operating reliably at speeds between 30-800 mm/s.
Replacing the Airtac SI63 Standard Cylinder SI63AX155S with the SAI63AX155S
To replace the SI63AX155S, order the SAI63AX155S. Verify the ISO 15552 mounting interface, 155mm stroke, G3/8 port, and M16x1.5 rod thread. The -A suffix specifies the SUS420J2 stainless rod, and -S confirms the magnet for CS1-B/DS1-B switches. For sizing, a 50mm bore yields 982 N push at 0.5 MPa, while an 80mm bore provides 2513 N. Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 155mm stroke, rod bending is minimal, but ensure guide alignment to prevent side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX155S
- ✓ 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 SI63AX155S FAQ
Yes, the SI63AX155S is discontinued. The direct replacement is the SAI63AX155S. It shares the same ISO 15552 mounting interface, 63mm bore, 155mm stroke, output force, G3/8 port, and SUS420J2 stainless rod, fitting directly into existing installations.
This double-acting cylinder uses a G3/8 air port. It generates 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. Operating pressure is 0.15-1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX155S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX155S replacement — usually within 7-8 hours.