55 heat shrink crimp-and-solder butt connectors in three wire gauge sizes — red (22–18 AWG), blue (16–14 AWG), and yellow (12–10 AWG) — in a compact labeled kit. These butt connectors combine crimping and soldering in one step: the crimp holds the wire in place mechanically, and the solder slug melts during heat shrinking to flow through the wire strands, delivering a connection that's 80% stronger than standard PVC crimp terminals and fully sealed against moisture.

What's Included

Red heat shrink crimp-solder butt connectors — 22–18 AWG, 20 pieces
Blue heat shrink crimp-solder butt connectors — 16–14 AWG, 20 pieces
Yellow heat shrink crimp-solder butt connectors — 12–10 AWG, 15 pieces
55 pieces total

Specifications

Terminal type	Heat shrink crimp-and-solder butt connectors
Wire gauges	Red: 22–18 AWG / Blue: 16–14 AWG / Yellow: 12–10 AWG
Strength vs. PVC crimp	80% stronger
Installation	Crimp wire, apply heat — solder flows automatically during shrink
Inspection window	Yes — visual confirmation that wire is seated correctly before crimping
Wire stop	Yes — prevents wire over-insertion
Seam construction	Brazed seams where applicable
Total pieces	55

Best For

Marine and RV electrical work — crimp-solder butt connectors are the industry standard for moisture-exposed wiring; the sealed heat shrink sleeve prevents the corrosion that eventually fails standard crimp splices in wet environments
Automotive wiring repair and upfitting — splices on trailer wiring, aftermarket lighting, and accessory circuits are exposed to road vibration and weather; the crimp-plus-solder construction handles both
Off-road and specialty vehicle builds — connections on builds that see vibration, water crossings, and high-heat environments benefit from the mechanical crimp and the sealed solder joint working together
Any shop replacing standard crimp terminals — once you've used crimp-solder butt connectors, standard vinyl crimp terminals feel like a compromise on any connection that matters

How Crimp-and-Solder Butt Connectors Work

These butt connectors combine two connection methods in a single installation step:

Strip and insert — strip the wire to the specified length and insert into the barrel. The inspection window lets you confirm the wire is fully seated before crimping. The wire stop prevents over-insertion.
Crimp — crimp the barrel with the appropriate crimping tool. The crimp mechanically locks the wire in place and provides immediate tensile strength.
Apply heat — use a heat gun on the connection. The heat shrink sleeve shrinks around the barrel, and the solder sleeve inside melts and flows into the wire strands, creating a gas-tight, soldered joint inside the already-crimped barrel.

The result: a connection with the mechanical holding strength of a crimp AND the conductivity and sealing properties of a solder joint — with the outer heat shrink providing a weatherproof barrier against moisture, corrosion, and abrasion. Questions? Contact us.

Shipping & Ordering

Ships within 1–2 business days from our warehouse
Volume pricing available — save up to 20% when ordering 3 or more
Reorder regularly? Ask us about a B2B account with a quarterly restock cadence and custom pricing — contact us

Electrical Assortments

55 Piece Heat Shink Crimp and Solder Butt Connector Assortment Starter Kit