Everything you need for clean, reliable wire-to-terminal solder connections in a single kit. The 51-piece Solder Slug and Flux Assortment pairs battery terminal solder slugs with flux across multiple sizes, pre-sorted in a 6-hole plastic bin that's ready to mount in your toolbox or service cart the moment it arrives.

What's Included

Battery terminal solder slugs — multiple sizes to cover a range of wire gauges and terminal types
Flux — for clean solder flow and oxide-free connections
6-hole plastic organizer bin — pre-sorted storage included with the kit
51 pieces total

Specifications

Application	Wire-to-terminal soldering — battery terminals, ring terminals, and butt splices
Contents	Solder slugs and flux, multiple sizes
Storage included	Yes — 6-hole plastic bin, pre-sorted
Total pieces	51
Best used with	Heat gun or soldering iron rated for terminal work

Best For

Automotive technicians — battery terminal replacements, wire harness repairs, and ring terminal connections are cleaner and faster with pre-formed solder slugs than with solder wire alone
Fleet maintenance shops — technicians who regularly replace battery cables and terminals benefit from having the right slug size on hand rather than measuring and cutting solder wire each time
Marine and RV service — corrosion-prone environments where a gas-tight, flux-cleaned solder joint outlasts crimp-only connections
Electrical contractors — anyone working with heavy-gauge wire terminations who needs a consistent, repeatable result across multiple connections

How Solder Slugs Work

Solder slugs are pre-formed solder pellets sized to fit inside crimp-style battery terminals and ring lugs. Unlike loose solder wire, each slug delivers a measured amount of solder directly to the joint — no guesswork, no waste.

Basic process:

Strip the wire to the correct length and insert it into the terminal barrel
Drop the appropriately sized solder slug into the terminal opening
Apply heat with a heat gun or soldering iron until the slug melts fully and wicks into the strands
Allow to cool without disturbing — the flux cleans the joint as it flows, leaving a bright, oxide-free solder connection

The result is a mechanically solid, gas-tight joint that resists vibration and corrosion better than a crimp-only connection. Questions about sizing or technique? Contact us — we're happy to help.

Shipping & Ordering

Ships within 1–2 business days from our warehouse
Free shipping on orders $50 and over
Volume pricing available — save up to 20% when ordering 3 or more
Stocking for a service department? Ask us about B2B pricing and scheduled restocking — contact us

Solder Slug Assortments

51 Piece Solder Slug and Flux Assortment Starter Kit