This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X145, 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 SI63X145
The AirTAC Airtac SI63 Standard Cylinder SI63X145 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 SAI63X145, 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 → SAI63X145
- 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 SI63X145
The AirTAC SI63X145 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 145mm stroke. Delivering 1559N push force at 0.5MPa, it features a 20mm rod, M16x1.5 thread, and a G3/8 port. The direct replacement is the SAI63X145, matching the interface, force, and mounting exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For this non-magnet SKU, position sensing is impossible. For high heat, Viton H seals raise the operating range to 150C.
Airtac SI63 Standard Cylinder SI63X145 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X145 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X145 |
| 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 SAI63X145 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 SAI63X145 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 SI63X145
| 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 SI63X145 Is Used
Clamp Actuation
Provides reliable 1559N clamping force for mid-weight machining fixtures.
Package Diversion
Drives 145mm stroke diverting arms to route goods along handling lines.
Pallet Stopping
Acts as a robust stop gate for medium pallets on roller conveyors.
Replacing the Airtac SI63 Standard Cylinder SI63X145 with the SAI63X145
To replace the SI63X145, order the SAI63X145. Verify the ISO 15552 mounting interface, G3/8 port, and 145mm stroke. Because this specific SKU lacks the -S magnet suffix, it cannot accept CS1-B or DS1-B sensors. If you need position feedback, select the SAI63X145S. Sizing both ways: a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. Note that a plain cylinder drifts on air loss; the air cushion only decelerates near stroke end. For secure load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X145
- ✓ 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 SI63X145 FAQ
Yes, the SI63X145 is discontinued. The direct replacement is the SAI63X145. It is dimensionally interchangeable per ISO 15552, keeping the same 63mm bore, 145mm stroke, G3/8 port, and mounting fixtures.
The 63mm bore features a G3/8 port. It delivers 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.
Request a Quote for the SAI63X145
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X145 replacement — usually within 7-8 hours.