Harris Safety-Silv 45 (part number 4515) is a cadmium-free, 45% silver brazing filler metal designed for general-purpose high-silver brazing of copper, brass, bronze, steel, and stainless steel. Available in 1/32 in (0.8 mm) diameter wire in a convenient 5 troy-ounce coil/box format, Safety-Silv 45 has been the industry benchmark for decades. Its 145 °F melting range provides excellent fillet-forming qualities and is well-suited for filling wider joint clearances — characteristics that differentiate it from narrower-range alloys like Safety-Silv 56. The alloy is lead-free and complies with EU REACH and RoHS directives, making it appropriate for food-service equipment, medical device manufacturing, and any application requiring a non-toxic filler metal. The alloy requires a separate flux — Harris Stay-Silv White Brazing Flux is recommended for most applications.
| Property | Value |
|---|---|
| AWS Classification | AWS A5.8 BAg-5 |
| ASME Specification | ASME SFA-5.8 BAg-5 |
| Other Standards | QQ-B-654A Class BAg-5; ISO 17672 Ag 245 |
| Silver (Ag) | 44 – 46 % |
| Copper (Cu) | 29 – 31 % |
| Zinc (Zn) | 23 – 27 % |
| Other (Total) | 0.15 % max |
| Solidus (melting point) | 1,225 °F (663 °C) |
| Liquidus (flow point) | 1,370 °F (743 °C) |
| Melting Range | 145 °F (81 °C) |
| Fluidity Rating | 6.5 (high — flows readily above liquidus) |
| Wire Diameter | 1/32 in (0.8 mm) |
| Package | 5 troy ounce coil/box |
| Color Code | Green |
| Cadmium Free | Yes |
| Flux Required | Yes — Harris Stay-Silv White Flux |
| Recommended Joint Clearance | 0.002 – 0.005 in (0.05 – 0.13 mm) |
Safety-Silv 45 is a go-to alloy for fabrication shops and contractors who need a reliable cadmium-free silver braze across a broad range of base metals and service conditions.
- HVAC and Refrigeration — copper-to-brass and copper-to-steel fittings in air handlers, condensers, and evaporator coils (use Stay-Silv 15 for copper-to-copper; Safety-Silv 45 when steel is involved)
- Plumbing and Piping — high-pressure water, steam, and gas lines where standard soft solder lacks sufficient joint strength
- Electrical and Electronics — bus bar connections, motor armature brazing, and relay contacts requiring excellent electrical conductivity
- Food Service Equipment — NSF-compliant joints on stainless steel fabrications (verify with applicable code authority)
- Maintenance and Repair — re-brazing carbide tips, broken castings, and dissimilar-metal assemblies in field service
- Government and Military — often specified for compliance with QQ-B-654A and federal specifications
Safety-Silv 45 is applied with an air-acetylene, oxygen-acetylene, or oxygen-propane torch, depending on joint mass. Use a soft, slightly reducing flame (avoid excess oxidizing flame, which can consume flux prematurely). Heat the base metal, not the alloy — apply the rod when the base metal reaches brazing temperature (a dull red color on steel, or when white flux becomes liquid and clear on copper). Direct flame to the fitting or heavier mass component first, then work toward the tube to draw the alloy by capillary action.
Apply Harris Stay-Silv White Brazing Flux generously to all surfaces to be brazed before assembly. The flux melts and becomes water-clear at brazing temperature, signaling that the base metal is ready for alloy application. After brazing, quench immediately with water to crack and remove flux residue, then wire-brush or use emery cloth for complete cleanup.
- Choose Safety-Silv 45 (BAg-5) when the joint clearance is wider (0.002–0.005 in), when multiple passes are needed, or when the base metal includes steel or stainless steel requiring a filler that tolerates a broader temperature window.
- Choose Safety-Silv 56 (BAg-7) when you need the lowest possible brazing temperature, the highest fluidity, and the tightest alloy flow (capillary joints 0.001–0.003 in clearance). Safety-Silv 56 is also NSF 51 certified for food equipment.
- What AWS classification is Harris Safety-Silv 45?
- AWS A5.8 BAg-5 (ASME SFA-5.8). Contains 45% Ag, 30% Cu, 25% Zn. Solidus 1,225 °F / liquidus 1,370 °F. Also complies with QQ-B-654A and ISO 17672 Ag 245.
- Does Safety-Silv 45 require flux?
- Yes — use Harris Stay-Silv White Brazing Flux. Apply before heating; remove all residue after brazing by quenching and wire-brushing.
- Can Safety-Silv 45 braze stainless steel?
- Yes. Unlike phosphorus-bearing alloys (BCuP-5), Safety-Silv 45 does not form brittle iron phosphide and is approved for brazing steel, stainless steel, copper, and brass.
- What is the melting temperature of Safety-Silv 45?
- Solidus 1,225 °F (663 °C); liquidus 1,370 °F (743 °C); melting range 145 °F (81 °C).
Shop the full welding wire and brazing alloy collection. See also the Harris Safety-Silv 45FC flux-coated version (eliminates separate flux application) and the Harris Safety-Silv 56 BAg-7 for applications requiring the lowest brazing temperature. AWS A5.8 classification details available from the American Welding Society and the Harris Products Group.