This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X205, 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 SI63X205
The AirTAC Airtac SI63 Standard Cylinder SI63X205 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 205mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X205, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke205 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X205
- 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 SI63X205
The AirTAC SI63X205 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 205 mm stroke. It delivers 1559 N push and 1402 N pull at 0.5 MPa, utilizing a G3/8 air port and an M16x1.5 rod thread. Because 205 mm is a non-standard stroke length, expect a longer lead time or custom machining. The direct replacement is the SAI63X205, sharing the exact ISO 15552 mounting interface, output force, and port size.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet and cannot accept a position sensor. If you need load holding on air loss, explore the SAIL or BSAI lock variants, as standard cushions only decelerate.
Airtac SI63 Standard Cylinder SI63X205 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X205 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X205 |
| Bore size | Ø63 mm |
| Stroke | 205 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 SAI63X205 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 SAI63X205 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 SI63X205
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×205 | 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 SI63X205 Is Used
Mid-Tonnage Clamping
Holds workpieces securely in CNC machining fixtures using 1559 N of thrust at 0.5 MPa, ensuring rigid positioning during metal cutting.
Package Diversion
Actuates routing gates and pushers on 63 mm profile assemblies, with the 205 mm stroke moving cartons between parallel transport lines.
Pallet Stops
Functions as a heavy-duty end-stop on roller conveyors, raising a 20 mm rod to arrest pallets moving at moderate speeds.
Replacing the Airtac SI63 Standard Cylinder SI63X205 with the SAI63X205
To replace the discontinued SI63X205, order the SAI63X205. Verify your ISO 15552 mounting accessory (LB foot, FA flange, TC trunnion, etc.), the G3/8 port thread (PT/G/NPT), and the 205 mm stroke. Since this SKU lacks a magnet, it cannot support CS1-B or DS1-B sensors; if sensing is required, switch to an SAI63X205S. For sizing alternatives, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. At 205 mm stroke, ensure adequate guide support to prevent rod bending and side-load wear. Standard cylinders drift without live air; for load holding, specify the SAIL air-released lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X205
- ✓ 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 SI63X205 FAQ
Yes, the AirTAC SI63X205 is discontinued. The direct replacement is the SAI63X205. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 205 mm stroke, G3/8 port, and mounting interface, so it drops directly into existing fixtures.
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 speed is 30-800 mm/s.
Request a Quote for the SAI63X205
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X205 replacement — usually within 7-8 hours.