This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX275, 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 SI63BX275
The AirTAC SI63 Standard Cylinder SI63BX275 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 275mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX275, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke275 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX275
- 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 SI63BX275
The AirTAC SI63BX275 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 275mm stroke. It delivers 1559 N push and 1402 N pull at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63BX275, which shares the exact ISO 15552 mounting interface, bore, stroke, force and port size for seamless fixture integration.
This specific SKU features a SUS304 stainless piston rod for corrosion resistance, but because it lacks a magnet, it cannot accept position switches. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life.
Airtac SI63 Standard Cylinder SI63BX275 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX275 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX275 |
| Bore size | Ø63 mm |
| Stroke | 275 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 SAI63BX275 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 SAI63BX275 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 SI63BX275
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×275 | 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 SI63BX275 Is Used
Stainless Rod Clamping
Clamps machined parts in humid washdown cells where the SUS304 rod resists corrosion better than standard carbon steel.
Mid-Stroke Diversion
Pushes packages across a 275mm offset transfer zone using 1559 N of thrust at 0.5 MPa operating pressure.
Replacing the Airtac SI63 Standard Cylinder SI63BX275 with the SAI63BX275
To replace the SI63BX275, order the SAI63BX275. Verify your ISO 15552 mounting accessory (LB, FA, CA, TC), the G3/8 port thread (PT/G/NPT) and the 275mm stroke. This stainless-rod unit has no magnet, so it cannot use CS1-B/DS1-B sensors; order an SAI-S if sensing is needed. At 275mm stroke, guide external rods to prevent side-load bending. For higher force, the 80mm bore offers 2513 N push at 0.5 MPa; for less, the 50mm gives 982 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or SAIL/BSAI lock for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX275
- ✓ 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 SI63BX275 FAQ
Yes, the AirTAC SI63BX275 is discontinued. The direct replacement is the SAI63BX275. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 275mm stroke, G3/8 port and mounting interface.
This 63mm bore cylinder features a G3/8 air port, M16x1.5 rod thread and 30mm cushions. It outputs 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX275
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX275 replacement — usually within 7-8 hours.