This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX75H, 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 SI63BX75H
The AirTAC SI63 Standard Cylinder SI63BX75H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 75mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX75H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke75 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX75H
- 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 SI63BX75H
The AirTAC SI63BX75H is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 75 mm stroke. This specific SKU features a SUS304 stainless steel rod for corrosion resistance and a Viton H seal, extending the operating temperature range from -20/+70 C up to 0-150 C. Delivering 1559 N of push force at 0.5 MPa through a G3/8 port, its direct replacement is the current-production SAI63BX75H, which shares the exact same ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade introduces an advanced piston seal utilizing two Y-shaped one-way elements for extended lifespan and lower start-up pressure. Because this legacy SI unit lacks a magnet (-S suffix), it cannot accept position sensors like the CS1-B or DS1-B switches.
Airtac SI63 Standard Cylinder SI63BX75H Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX75H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX75H |
| Bore size | Ø63 mm |
| Stroke | 75 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 SAI63BX75H 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 SAI63BX75H 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 SI63BX75H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×75 | 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 SI63BX75H Is Used
High-Temperature Forming
Actuates press doors and material stops in thermal environments up to 150 C, leveraging the Viton H seal and SUS304 rod to resist heat and corrosion.
Corrosive Washdown Divert
Pushes packages or parts on processing lines where moisture and chemicals are present, relying on the stainless steel piston rod for longevity.
Mid-Force Clamping Jigs
Provides 1559 N of push force at 0.5 MPa to hold workpieces securely in machining fixtures without requiring the maximum system pressure.
Replacing the Airtac SI63 Standard Cylinder SI63BX75H with the SAI63BX75H
To replace the discontinued SI63BX75H, order the SAI63BX75H. Verify that your existing fixture matches the ISO 15552 mounting interface dimensions, the 63 mm bore, the 75 mm stroke, and the G3/8 port. Retain your original mounting accessories (such as LB foot or TC trunnion) and confirm the high-temperature Viton H seal and SUS304 stainless rod requirements are specified for the new unit. If sizing alternatives, a neighbouring 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Note that a plain double-acting cylinder does not hold load without live air; the adjustable 30 mm air cushions only decelerate the piston near stroke ends. For secure load holding during air loss, consider an external pilot-operated check valve, a rod lock, or the SAI family's SAIL (air-released lock) and BSAI (clamp-lock) variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX75H
- ✓ 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 SI63BX75H FAQ
Yes, the AirTAC SI63BX75H is discontinued and end-of-life. The direct replacement is the SAI63BX75H. It is dimensionally interchangeable per the ISO 15552 mounting interface, maintaining the same 63 mm bore, 75 mm stroke, output force, G3/8 port, and mounting compatibility.
The cylinder features a G3/8 air port and a 20 mm piston rod. The theoretical force outputs 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. It operates at speeds between 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX75H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX75H replacement — usually within 7-8 hours.