This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX145, 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 SI63AX145
The AirTAC Airtac SI63 Standard Cylinder SI63AX145 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 145mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX145, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke145 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX145
- 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 SI63AX145
The AirTAC SI63AX145 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore, 145 mm stroke, and a SUS420J2 stainless steel piston rod. It delivers 1559 N push force at 0.5 MPa through its G3/8 port. Because this legacy unit lacks a -S magnet, it cannot accept position switches. The direct replacement is the current-production SAI63AX145, which shares the exact ISO 15552 mounting interface, bore, stroke, output force, and porting.
The SAI upgrade introduces a two-piece Y-shaped piston seal for lower start-up pressure and extended life. Note that a standard cylinder drifts on air loss; the cushion only decelerates. For load holding, explore the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63AX145 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX145 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX145 |
| Bore size | Ø63 mm |
| Stroke | 145 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 SAI63AX145 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 SAI63AX145 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 SI63AX145
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×145 | 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 SI63AX145 Is Used
Stainless Rod Actuation
Drives moving platens in packaging machinery where the SUS420J2 rod provides enhanced resistance against moisture and corrosion.
Mid-Force Diverting
Pushes medium-weight packages off a processing line utilizing the 1559 N thrust available at 0.5 MPa operating pressure.
Fixture Clamping
Secures work-holding fixtures on automated assembly tables, taking advantage of the stable 63 mm ISO 15552 profile barrel.
Replacing the Airtac SI63 Standard Cylinder SI63AX145 with the SAI63AX145
To replace the SI63AX145, order the SAI63AX145 to retain the identical ISO 15552 mounting interface, 63 mm bore, 145 mm stroke, and G3/8 port. Specify the -A rod option to keep the SUS420J2 stainless steel rod, and remember this specific SKU has no magnet, so it cannot support legacy CS1-B/DS1-B sensors. If you need to adjust force, the neighboring 50 mm bore yields 982 N push at 0.5 MPa, while the 80 mm bore provides 2513 N. For applications requiring load holding on air loss, do not rely on the adjustable air cushion; instead, integrate an external pilot check valve or choose the SAIL air-released lock or BSAI clamp-lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX145
- ✓ 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 SI63AX145 FAQ
Yes, the SI63AX145 is discontinued. The direct replacement is the SAI63AX145. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 145 mm stroke, G3/8 port, and mounting fixtures perfectly.
This cylinder features 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX145
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX145 replacement — usually within 7-8 hours.