No Flux Required Solder | McMaster-Carr

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4 Products

Paste Solder

Use this paste in hard-to-reach areas—apply a thin coat of paste to the surfaces you want joined, apply heat, and wipe with a damp cloth. Paste is made of finely powdered solder combined with a flux paste, so it creates strong welds without needing separate flux.

Lead-Free—Lead-free solder is safer to use than leaded solder and helps meet industry regulations.

		Material Composition
	Solder Alloy	Tin	Antimony	Lead	Melting Temp., ° F	Solder Type	Form	Wt., lb.		Each
For Joining Brass, Copper, Nickel, Steel, and Zinc Alloy



		Sn95Sb5	95%	5%	0%	470	Lead-Free, No Flux Required	Paste	1	7774A15	000000

No-Flux Solder for Aluminum

Join aluminum without flux for cleaner results and less residue to clean up afterward. Made from a zinc-aluminum alloy, this solder forms strong joints on its own.

Lead-Free, No Flux Required

Lead-free solder is safer to use than leaded solder and helps meet industry regulations.

		Material Composition						2 lb.
	Solder Alloy	Zinc	Aluminum	Lead	Dia.	Melting Temp., ° F	Lg.		Pkg.
For Joining Aluminum



		Zn98Al2	98%	2%	0%	0.125"	760	18"	7664A4	000000

High-Density Low-Melting-Point Solder

This bismuth-tin solder has similar performance properties to lead solder, but is also safe for use in food-processing equipment and copper water pipes. It has a lower melting point than most solders, so it’s good for sensitive assemblies, such as semiconductors and electronic components, as well as for step soldering with traditional solders. However, it’s less thermally conductive than other metals and more brittle than lead. Flux isn’t required, but for easier cleanup use it with no-clean soldering flux. Do not use this solder on drinking water pipes.

Lead-Free, No Flux Required

Lead-free solder is safer to use than leaded solder and helps meet industry regulations.

1% Silver—Solder with 1% silver forms stronger bonds than solder without silver. It’s also more malleable and ductile. However, it has a higher melting point, so it takes longer to solder.

		Material Composition							0.12 oz.
	Solder Alloy	Bismuth	Tin	Silver	Lead	Dia.	Melting Temp., ° F	Lg.		Each
For Joining Aluminum, Brass, Bronze, Copper, Nickel, Stainless Steel, Steel, and Zinc Alloy



		Bi57Sn42Ag1	57%	42%	1%	0%	0.030"	285	36"	8520N113	0000000


		Bi58Sn42	58%	42%	—	0%	0.030"	280	36"	8520N111	000000