Harris Safety-Silv 56 (part number 5615) is a premium cadmium-free, 56% silver brazing alloy, classified AWS A5.8 BAg-7, supplied in a convenient 1/32 in (0.8 mm) diameter coil in a 5 troy-ounce box. The coil format unspools easily for torch feeding and suits both production environments and field service applications. Safety-Silv 56 delivers the lowest liquidus temperature (1,205 °F / 652 °C) of any of the major Harris high-silver alloys, combined with excellent fluidity and a narrow 60 °F melting range that gives the welder precise control over alloy flow. It is the preferred alloy for tight capillary joints on stainless steel, carbide tooling, thin-gauge assemblies, and food service equipment. NSF Standard 51 certified. Cadmium-free, lead-free, EU REACH and RoHS compliant.
| Property | Value |
|---|---|
| AWS Classification | AWS A5.8 BAg-7 |
| ASME Specification | ASME SFA-5.8 BAg-7 |
| Other Standards | QQ-B-654A Class BAg-7; AMS 4763; NSF ANSI 51 |
| Silver (Ag) | 56 % |
| Copper (Cu) | 22 % |
| Zinc (Zn) | 17 % |
| Tin (Sn) | 5 % |
| Solidus | 1,145 °F (618 °C) |
| Liquidus | 1,205 °F (652 °C) |
| Melting Range | 60 °F (33 °C) — narrow |
| Wire Diameter | 1/32 in (0.8 mm) |
| Package | 5 troy oz coil/box |
| Part Number | 5615 |
| Cadmium Free | Yes |
| NSF Certification | NSF Standard 51 — food service equipment |
| Flux Required | Yes — Harris Stay-Silv White Flux |
| Recommended Joint Clearance | 0.001 – 0.003 in (0.025 – 0.075 mm) |
- Food service and restaurant equipment — NSF 51 certified for food-contact surfaces; used on stainless steel tables, refrigeration shelving, and kitchen equipment assemblies
- Carbide tooling and inserts — high fluidity ensures complete penetration of tight carbide-to-steel braze joint clearances; high silver content provides ductility to absorb cutting shock
- Thin-gauge stainless steel fabrication — lowest liquidus in the family minimizes heat distortion on 16–22 gauge stainless
- Electrical switchgear and relay contacts — excellent electrical conductivity and heat resistance; used on silver-contact relay assemblies
- Medical devices and laboratory instruments — cadmium-free, NSF 51 certified composition acceptable for precision healthcare fabrications
- HVACR service — dissimilar metals — copper-to-stainless or copper-to-steel refrigeration joints where minimum heat input reduces risk of distortion or fitting damage
The 1/32 in (0.8 mm) diameter coil gives the operator a fine wire that provides excellent control over alloy deposition rate — particularly important with Safety-Silv 56 given its fast, highly fluid flow characteristics once above the 1,205 °F liquidus. Coil format also reduces setup time versus cut-length rods; the wire can be fed continuously from the coil during long production runs.
Safety-Silv 56 (BAg-7) contains no phosphorus — it is not self-fluxing and requires an external brazing flux on all joints. Apply Harris Stay-Silv White Brazing Flux to all joint surfaces before assembly. Heat the joint until the flux turns water-clear (indicating base metal is at or near solidus temperature), then apply alloy to the joint gap. High fluidity means the alloy fills quickly — avoid over-applying to prevent alloy runout onto adjacent surfaces. After brazing, quench immediately and wire-brush to remove all flux residue; unremoved flux causes corrosion over time.
- 5615 (coil box, 1/32 in, 5 toz) — coil format for continuous feeding; suits production work and situations where multiple joints are brazed per session. Better value per troy oz in volume.
- 5631 (cup, 1/16 in, 1 toz) — thicker wire for larger joints requiring more alloy per application; smaller quantity for trial purchasing or low-volume repair work.
- What AWS classification is Safety-Silv 56?
- AWS A5.8 BAg-7 / ASME SFA-5.8. Contains 56% Ag, 22% Cu, 17% Zn, 5% Sn. Also AMS 4763 and NSF ANSI 51.
- Difference between Safety-Silv 56 and Safety-Silv 45?
- Safety-Silv 56 has more silver (56% vs. 45%), lower liquidus (1,205 °F vs. 1,370 °F), narrower range (60 °F vs. 145 °F), and higher fluidity. Better for tight joints and stainless. Safety-Silv 45 suits wider gaps and multi-pass brazing.
- Is Safety-Silv 56 approved for food service?
- Yes — NSF ANSI Standard 51 certified, cadmium-free, lead-free.
- Why is it preferred for carbide brazing?
- High fluidity penetrates tight (0.001–0.003 in) carbide gaps; the 5% tin addition provides ductility to absorb cutting shock; the lower liquidus reduces heat stress in carbide.
Browse the full brazing alloy collection. Compare to the Harris Safety-Silv 56 cup (5631) in 1/16 in diameter and the Harris Safety-Silv 45 (BAg-5) coil for wider-gap brazing applications. Reference: Harris Products Group and AWS A5.8.