Do you crimp these or just twist the wires together and heat shrink them? if no crimping, how strong is it compared to crimping and heat shrinking?

You will just need to twist the wires together and heat shrink them. Solder inside the connector will melt and bond the wires together. The connection is almost as strong as crimping and heat shrinking. When heat is applied, polyolefin tubing reduces in size and adhesive flows inside the insulation, creating a strong seal

wouldn't this result in a cold solder joint? solder will melt before wire is up to temp?

Not based on my experience...having taken a few apart after I've completed them, they appear to be a reasonably good connection. Also, they don't melt immediately so there is some heating of that termination. Apart from a good mechanical integrity (and since I'm also using these for electrical circuits), I made a comparison to mechanical lug/crimps by measuring the resistance across the connection on the same wires. The mechanical crimp/lug was 2.5mΩ and the solder was 980µΩ. I don't think it would've been that good on a cold solder joint, IMO. When I used solder flux on the wires and then used the solder, it decreased that number by nearly 100µΩ. So, I think it's good. I'm very happy with these...

Will these work for solid wire rather than stranded?

I tried to use these when I put a brake controller on my SUV. I used UF underground solid wire ad it did not work too well. The heat shrink started to melt away before the solder would stick to the solid wire, it seemed to solder the stranded wire very nicely. I soldered the wires together and then slid the heat shrink butt connector over it .Just as a side note, I bought the heat gun fro HF and it did the job.

I can't get the solder to melt before the heat shrink tubing starts to burn. i am using a wagner heat gun. am i doing something wrong?

The heat gun you have sounds like a paint stripping heat gun. There is a heat gun available in harbor frieght that has 12 settings #'s 97114 or 69343 that is better suited for the task. Or you need to keep the heat gun further away and moving across the wires while you heat it.

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Reseñas

R**H

Ease of use

Works very well. Much better than wir0e nuts.

10.03.2026

S**N

Something so cheap, that works so good

Love these. Quick and easy, very strong connection.

9.01.2026

M**E

Easy to use. Quality solder joint with moisture barrier

Made replacing my Malibu's low beam headlight socket much easier. Good quality. Easy to get a quality solder joint without wrestling with the wires, soldering iron and solder. Just fit the two wires to join under the solder ring in the tube, heat it.

9.03.2026

D**M

Buy them

They work good just takes a little time for solder to melt

22.02.2026

R**.

Better quality than other brands I have tried

I have purchased different brands of this product and I will be purchasing this brand from now on. The solder melts and spreads before the heat shrink material splits and fails from to much heat. Although not recommended for use with a lighter I have found that this product is much more capable than others to use one effectively in the case where it is needed in the field with no electricity.

20.02.2026

D**N

Butt connectors

These butt connectors work well good price easy to use

7.02.2026

A**Y

Perfect for the job

My husband loves this kit! The connectors are easy to use, quality and a variety of sizes.

12.01.2026

D**H

Quality not there.

They accomplish what they say they do. But quality is poor. Wouldn’t purchase again.

7.01.2026

S**T

Good

11.02.2026

M**G

Doesn't work. Tried several. Have seen the solder flowing, but after cooling down, I could easily pull them apart. Went back to good old soldering iron and shrink sleeve.

16.07.2025

M**C

These are of good quality and a bargain at this price

19.10.2025

R**Y

Sehr gute Möglichkeit für ordentliche Kabelverbindungen. Kann ich nur empfehlen. Funktioniert super.

22.09.2025

J**N

Genial si tens la pistola per escalfar, realment funciona be. M ha agradat molt! Ho recumanu!

2.09.2025

ASIN	B07C3NBTJ9
Best Sellers Rank	#1,540 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #12 in Butt Terminals #538 in Electrical Equipment
Brand	haisstronica
Color	White,Red,Blue,Yellow
Connector Type	Butt Splice
Contact Material	Copper
Date First Available	April 10, 2018
Global Trade Identification Number	00192687297658
Insulation Material	Polyolefin
Is Discontinued By Manufacturer	No
Item Weight	3.84 ounces
Item model number	HX1004
Manufacturer	haisstronica
Material	Copper
Maximum Voltage	24 Volts (DC)
Number of Items	120
Product Dimensions	5.28"L x 4.02"W x 1.18"H
Temperature Rating	221 degree celsius
Terminal	Butt Terminal
UPC	192687297658
Unit Count	120 Count

haisstronica 120PCS Solder Seal Wire Connectors, Marine Grade Heat Shrink Butt Splice Connectors for Electrical, Stereo, Corrosion and Weatherproof

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