This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX375S, 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 SI63BX375S
The AirTAC Airtac SI63 Standard Cylinder SI63BX375S 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 SAI63BX375S, 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 → SAI63BX375S
- 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 SI63BX375S
The AirTAC SI63BX375S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 375mm stroke. It features a SUS304 stainless piston rod, delivering 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63BX375S, matching the interface, stroke, and force.
The SAI upgrade uses two Y-shaped one-way piston seals for low start-up pressure and long life. The original -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI accepts current AirTAC switches. The SAI family also adds SAIL, SAIF, and BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX375S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX375S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX375S |
| 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 SAI63BX375S 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 SAI63BX375S 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 SI63BX375S
| 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 SI63BX375S Is Used
Long-Stroke Diverting
Actuates routing gates on packaging lines, using the 375mm stroke to clear wide product lanes without intermediate linkages.
Stainless Rod Lowering
Lowers tooling assemblies in washdown environments, leveraging the SUS304 rod for corrosion resistance during repetitive descent cycles.
Pallet Stopper Arms
Deploys heavy stop arms at conveyor ends, relying on the 1559N push force at 0.5MPa to halt accumulated pallet loads safely.
Replacing the Airtac SI63 Standard Cylinder SI63BX375S with the SAI63BX375S
To replace the SI63BX375S, order the SAI63BX375S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G3/8 port thread, and the M16x1.5 rod end. The -B rod is SUS304 stainless; the -S magnet enables CS1-B/DS1-B sensors. Because stroke is 375mm, use external guides to prevent rod bending under side loads. If sizing up or down, note the 50mm bore offers 982N push at 0.5MPa, while the 80mm bore offers 2513N. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX375S
- ✓ 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 SI63BX375S FAQ
Yes, the SI63BX375S is discontinued. The direct replacement is the SAI63BX375S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 375mm stroke, G3/8 port, and mounting interface, so it drops directly into existing fixtures.
The G3/8 port feeds a 20mm piston rod. At 0.5MPa it provides 1559N push and 1402N pull force. This rises to 2182N push at 0.7MPa and 2805N at 0.9MPa. The theoretical maximum force is 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX375S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX375S replacement — usually within 7-8 hours.