[5pcs] 4 Awg - 3/8 Stud, Copper Wire Lug, Ring Terminal, Battery Cable End, Cable Lug, Wire Connector by KeeRoarin

Made of solid copper ! Nice, good size hole to fit different sizes fittings! But not made of ground welding wires.

Plenty of copper to crimp down and hold the wire in place. Feel good and solid. Got the job done.

These are first rate terminals made of 100% pure copper for excellent conductivity! The quality is very nice, with terminal size clearly stamped, and they are accurately sized for the wire gauge they represent. Very good value!

I got the 8 AWG - 1/4 lugs. They have a nice thickness. I cut into one with a Dremel and it seems to be solid copper. An 8 AWG wire fits fine and a 1/4 bolt fits the ring with only a bit to spare. Exactly what I needed!

I have a decent sized solar setup and I am constantly upgrading or changing things around. I go through a fair amount of terminals, mainly in setting up the connections between the various battery banks and the inverter. These lugs are copper, fit perfectly, crimp and solder easily. Exactly what I wanted. 5 stars for matching description exactly. Note: I have been an Amazon customer for almost 20 years. I write all of my reviews to reflect my personal observations and opinions on a product. It matters not if I have purchased the item myself or if it was provided to me for review. My goal is to provide other potential customers as much real-world knowledge as possible to make an informed decision. In most cases I will return to my review in 6 months or less to see if I should alter my original observations. In no case will the cost of a product influence my opinions at all. In addition, I will try to include multiple images and or videos on each product, if practical.

I ordered the 2/0 terminals for an inverter setup for my vehicle. These things are beefy, as expected. They crimp well and have lots of contact surface to make a good connection. I am very happy with the build quality, these things look like they will last.

No problem inserting the correct size awg wire and soldering the lug onto the wire. I did use flux and had no problems with adhesion. Worked just fine. With they had a size between the 1/2” and 1/4” hole. I’m sure 3/8” or 5/16” would be the most popular for the hole size. I used the larger 1/2” hole and put a stainless washer over the lug so it could be secured.

I used some of these to build new golf cart power leads. They were easy to crimp, and hold secure. I actually crimped them down to 4ga, as I bought 2ga by mistake, but since they are copper, they crimped fine. I will probably tin the next few for longevity, and to protect against dissimilar metals on certain areas they are attached.

Decent enough lugs to get the job done. Crimps easy enough to wires and carries power through them without making a hot spot when used appropriately. Using these on the terminals of 24V lifepo4 batteries in parallel to upgrade some UPSs life and runtimes, they are doing decently so far. Should last the life of the device.

I ordered the 4AWG 5/16 terminals and when I first received them I thought I had the wrong gauge. They appear much larger than some other existing 4awg terminals I have. Upon further inspection, I think theyre actually better quality. Using a micrometer, I measured the same internal diameter as my others (about 7.5mm), and this one is actually a little more round. I think 2 things make it look larger. The first is it has a flared end where the wire goes in, and the second is that it fully encloses the wire. The flared end is is good to help you insert the wire, but on the other hand it could be harder to crimp flush with your wire. This terminal is also thicker than my others (2mm). Additionally, when the wire is fully inserted, it will not stick out the other side as theres no opening opposite the entry; it is fully enclosed. Overall, this seems to be a good quality terminal.