Lucas Milhaupt 98701 Sil-fos 15 Brazing Ring 3/8 Inch Od

Product Description

The LUCAS MILHAUPT 98701 is a Sil-Fos 15 brazing alloy ring designed for joining copper tubing and fittings in HVAC/R systems. Composed of 15% silver (Ag), 80% copper (Cu), and 5% phosphorus (P), conforming to AWS specification BCuP-5, each ring is pre-formed to fit inside flared fittings for precise alloy placement. When the joint is brought to proper brazing temperature, the ring melts and flows to create a tight, leak-free connection. HVAC/R technicians and refrigeration mechanics install these rings during new installations, retrofits, and refrigerant line repairs where a controlled, repeatable braze joint is required.

These rings are suited for residential and light commercial HVAC/R applications involving copper-to-copper tube and fitting connections. The pre-formed ring format eliminates the need to manually cut and position rod stock at the joint, making them especially practical for production brazing environments or confined-space installations. Each pack contains 25 rings sized for 3/8-inch OD copper tubing, covering common line set and refrigerant circuit diameters encountered in split-system air conditioning and refrigeration service.

Key Features

• AWS BCuP-5 certified brazing alloy with 15% silver content for reliable copper-to-copper joints
• Pre-formed ring format minimizes material waste and provides visual confirmation of a complete braze joint
• Solidus temperature of 1190 degrees F and liquidus temperature of 1475 degrees F for consistent flow characteristics
• Sized for 3/8-inch OD fittings — fits inside standard flared copper fittings used in HVAC/R line sets
• 25 rings per pack for job-lot convenience on production or multi-joint service calls
• Manufactured in the USA

Compatibility

Designed for brazing copper-to-copper tubing joints and fittings in HVAC/R refrigerant systems where a BCuP-5 silver-phosphorus alloy is specified. Fits inside flared fittings accepting 3/8-inch OD copper tubing.

Installation Notes

Brazing of refrigerant-circuit copper tubing is typically performed by licensed HVAC/R technicians or qualified refrigeration mechanics in accordance with applicable mechanical codes and local jurisdiction requirements. Before brazing, recover all refrigerant and purge the line set with dry nitrogen to prevent oxidation scale inside the tubing. Use a properly sized torch tip and bring the joint to brazing temperature by heating the base metal, not the ring directly. Allow the joint to cool naturally before handling and perform a leak check before returning the system to service.

Technical Specifications

• AWS Specification: BCuP-5
• Composition: Ag15Cu80P5 (15% Silver, 80% Copper, 5% Phosphorus)
• Silver Content: 15%
• Solidus Temperature: 1190 degrees F (643.33 degrees C)
• Liquidus Temperature: 1475 degrees F (801.67 degrees C)
• Ring OD: 3/8 inch (fits 3/8-inch OD copper tubing)
• Length: 0.625 inches
• Width: 0.375 inches
• Quantity per Pack: 25 rings
• Unit of Measure: Each (EA)
• Proposition 65: Yes
• Country of Origin: USA

Standard Information

• Brand: LUCAS MILHAUPT
• Manufacturer Part Number: 98701