5520R1 - Safety-Silv 5 Phos-Copper Brazing Alloy 3/32"

Harris Safety-Silv 5: The HVAC Tech's Workhorse

When you are up on a ladder or squeezed into a crawlspace fixing a line set, you need a brazing rod that is forgiving and reliable. Harris Safety-Silv 5 (5520R1) is widely considered the industry standard for copper plumbing and HVAC/R work. This 1 lb tube of 3/32" rods gives you the perfect balance of performance and value, sitting right between the brittle, cheap phos-copper rods and the expensive high-silver alloys.

Why Use 5% Silver?

Pure copper-phosphorus rods can crack under vibration. By adding 5% silver, Harris makes this rod tough enough to handle the "shakes" of a compressor or the expansion and contraction of a heat pump system. It creates a strong, ductile joint that won't let you down. Plus, on clean copper pipe, you don't even need flux! The rod cleans the metal as it melts, saving you time and keeping your system clean from flux residue.

Great for Bridging Gaps

One of the best features of Safety-Silv 5 is how it handles. Unlike 15% or 45% silver which flows like water the second it melts, Safety-Silv 5 has a "slushy" range. As you heat it, it gets soft before it turns completely liquid. This allows you to "cap" a joint or fill a gap where the pipe fitting might be a little loose. If you can't get a perfect swage in the field, this rod helps you seal the deal without leaks.

Application Tips

• Copper to Copper: No flux needed. Just clean the pipe, heat it to a dull cherry red, and apply the rod.
• Copper to Brass: You MUST use flux (like Stay-Silv White) because the zinc in brass prevents the rod from wetting properly.
• Flame Setting: Use a neutral oxy-acetylene flame. Heat the tube first, then the fitting, and let the heat of the copper melt the rod—don't melt the rod with the torch flame directly.

This 1 lb tube contains approximately 20-24 sticks, which is plenty for several service calls or a decent sized install job. The 20-inch length gives you good reach without burning your fingers.