This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX45, 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 SI63AX45
The AirTAC Airtac SI63 Standard Cylinder SI63AX45 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 45mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX45, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke45 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX45
- 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 SI63AX45
The AirTAC SI63AX45 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 45 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63AX45, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, and force ratings.
The SAI upgrade features a modernized piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. This specific SKU lacks a magnet (-S) and cannot accept a sensor. It uses a SUS420J2 stainless piston rod (-A) for corrosion resistance.
Airtac SI63 Standard Cylinder SI63AX45 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX45 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX45 |
| Bore size | Ø63 mm |
| Stroke | 45 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 SAI63AX45 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 SAI63AX45 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 SI63AX45
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×45 | 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 SI63AX45 Is Used
Clamp Actuation
Provides 1559 N of clamping force at 0.5 MPa for securing mid-weight machined components during milling or drilling operations.
Package Diverting
Short 45 mm stroke pushes diverters or gates to redirect medium-sized cartons on packaging lines at speeds up to 800 mm/s.
Press Ejection
Ejects formed parts from press dies, using the SUS420J2 stainless rod to resist moisture and coolant splash in industrial environments.
Replacing the Airtac SI63 Standard Cylinder SI63AX45 with the SAI63AX45
To replace the SI63AX45, order the SAI63AX45. Confirm the ISO 15552 mounting interface, G3/8 port, and M16x1.5 rod thread match your fixture. This non-magnet SKU cannot hold a switch; if sensing is needed, select an SAI63X45S. Sizing both ways: a 50 mm bore yields 982 N push @0.5 MPa, while an 80 mm bore yields 2513 N. Note that a plain cylinder drifts on air loss; for load holding, specify an external pilot check valve or the SAIL/BSAI lock variant. The 45 mm stroke avoids rod-bending side-load issues seen in longer strokes.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX45
- ✓ 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 SI63AX45 FAQ
Yes, the SI63AX45 is discontinued. The direct replacement is the AirTAC SAI63AX45. It is dimensionally interchangeable per ISO 15552, maintaining the same 63 mm bore, 45 mm stroke, G3/8 port, and mounting interface, but features an upgraded piston seal for longer life.
This 63 mm bore cylinder uses a G3/8 air port. The theoretical forces are: 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 maximum force of 318 kgf at 1.0 MPa.
Request a Quote for the SAI63AX45
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX45 replacement — usually within 7-8 hours.