This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX375, 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 SI63AX375
The AirTAC Airtac SI63 Standard Cylinder SI63AX375 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 375mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX375, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke375 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX375
- 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 SI63AX375
The AirTAC SI63AX375 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 375mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa via a G3/8 port. The direct replacement is the SAI63AX375, retaining identical mounting, force, and stroke specifications.
This SKU features a SUS420J2 stainless piston rod (-A) and lacks a magnet, so it cannot accept position switches. The SAI upgrade utilizes two Y-shaped one-way piston seals for lower start-up pressure.
Airtac SI63 Standard Cylinder SI63AX375 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX375 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX375 |
| Bore size | Ø63 mm |
| Stroke | 375 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 SAI63AX375 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 SAI63AX375 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 SI63AX375
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×375 | 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 SI63AX375 Is Used
Material Diversion
Actuates routing gates on transfer lines, using the 1559N thrust to push heavy totes at 0.5MPa operating pressure.
Pallet Handling
Extends 375mm to index pallets into wrapping stations, requiring external guides to manage side loads.
Replacing the Airtac SI63 Standard Cylinder SI63AX375 with the SAI63AX375
To replace the SI63AX375, order the SAI63AX375. Verify the ISO 15552 interface, 375mm stroke, G3/8 port, and SUS420J2 rod. Because this 375mm stroke exceeds 300mm, use external guides to prevent rod bending and side-load wear. This non-magnetic SKU cannot support sensors; legacy CS1-B/DS1-B switches require an -S model. For sizing, neighbors are 50mm (982N push @0.5MPa) and 80mm (2513N push @0.5MPa). Note that air cushions only decelerate; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX375
- ✓ 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 SI63AX375 FAQ
Yes, the SI63AX375 is discontinued. The direct replacement is the SAI63AX375. It is dimensionally interchangeable per ISO 15552, keeping the same 63mm bore, 375mm stroke, force, G3/8 port, and mounting interface.
It has a G3/8 port. Force ratings are: 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX375
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX375 replacement — usually within 7-8 hours.