This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX155, 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 SI63AX155
The AirTAC Airtac SI63 Standard Cylinder SI63AX155 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 SAI63AX155, 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 → SAI63AX155
- 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 SI63AX155
The AirTAC SI63AX155 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 155mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63AX155, featuring the same interface, force, and mounting.
This SAI upgrade uses two Y-shaped one-way piston seals for low start-up pressure and long life. It also adds SAIL, SAIF and BSAI variants the SI lacked. The -A rod is SUS420J2 stainless steel. With no -S suffix, this SKU cannot take a sensor.
Airtac SI63 Standard Cylinder SI63AX155 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX155 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX155 |
| 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 SAI63AX155 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 SAI63AX155 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 SI63AX155
| 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 SI63AX155 Is Used
Mid-Tonnage Pressing
Applies the 1559N push force at 0.5MPa for seating bearings or light stamping tasks on automated lines.
Package Diversion
Actuates routing gates or pushers along material handling conveyors with a swift 155mm stroke.
Replacing the Airtac SI63 Standard Cylinder SI63AX155 with the SAI63AX155
To replace the SI63AX155, order the SAI63AX155. Confirm the ISO 15552 mounting interface, 155mm stroke, G3/8 port (PT/G/NPT) and -A SUS420J2 stainless rod. A 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. This SKU lacks a magnet (-S) and cannot accept CS1-B/DS1-B switches. The air cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant. At 155mm stroke, side-load risks are low, but ensure correct rod alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX155
- ✓ 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 SI63AX155 FAQ
Yes, the SI63AX155 is discontinued. The direct replacement is the SAI63AX155. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 155mm stroke, output force, G3/8 port and mounting fixtures.
This double-acting cylinder uses a G3/8 port. It generates 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX155
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX155 replacement — usually within 7-8 hours.