Would this work with molex automotive connectors? say molex 1326030-2

The crimp tool is CORRECT, but the CRIMP DIES it comes with are not. As others have stated, it comes with dies for insulated barrel connectors. I have not found this crimper to be sold with the open barrel connector dies but you can buy them separately. The correct Klein Tools VDV205-036 Wire Crimper Die, Terminal, Open Barrel, AWG 10-20, Replacement Die set is currently sold on Amazon as well.

Anyone know if this could be used on a 10 AWG copper cable lug like the type used on batteries?

These crimpers are rated for up to 10 AWG, will absolutely work for that size wire. Most automotive battery main cables are MUCH larger than 10awg, more like 6awg - 2awg, and these would NOT WORK for those sizes. 10awg - 22awg is the capacity range.

What is the thickness of the dies/gap for them to slide into the tool? Standard is 4mm, looking for one that fits 5mm wide dies.

I have been working in electronics for 50 years and still not clear. But might I suggest you either buy the crimping tool and if it doesn't suite your needs, simply return it. Or you could check the Klein Tools website yourself for detailed drawings.

The ad clearly says for "stranded copper wire", but the photos also clearly show crimping on solid wire. Does it work correctly on both wire types

I recently was installing a TV antenna. Code requires that external antennas be grounded with #10 or larger copper wire (or some other alternatives). So I used #10 solid copper wire. With one of those combination wire strippers, screw cutters, crimpers things, and squeezing as hard as I could, I could not get the crimp tight enough to keep the wire from sliding out. So I tried the Klein 3005CR. I saw that it was for stranded only, and was worried, but decided to give it a try anyway with the solid wire. It worked absolutely perfectly.

ASIN	B07WMB61J5
Brand	KLEIN TOOLS
Brand Name	KLEIN TOOLS
Color	Yellow,blue,red
Colour	Yellow,blue,red
Customer Reviews	4.7 out of 5 stars 6,183 Reviews
Global Trade Identification Number	00092644344008
Grip Type	Textured
Grip type	Textured
Handle Material	Rubber, Thermoplastic Elastomer (TPE), Plastic
Handle material	Rubber , Thermoplastic Elastomer (TPE) , Plastic
Included Components	Ratcheting Crimper
Item Dimensions L x W	22.9L x 7.6W centimeters
Item Length	9 Inches
Item Type Name	Wire Crimper Tool, Ratcheting Insulated Terminal Crimper for 10 to 22 AWG Wire Klein Tools 3005CR
Item Weight	1.3 Pounds
Item Width	3 Inches
Item weight	1.3 Pounds
Manufacturer	KLEIN TOOLS
Manufacturer Part Number	3005CR
Model Number	3005CR
Product dimensions	22.9L x 7.6W centimeters
Size	One Size
Specific Uses For Product	Electrical wiring, DIY projects, professional use, automotive work, home improvement tasks
UPC	092644344008
Unit Count	1 Count

Klein Tools Crimper Tool, Ratcheting Insulated Terminal Wire Crimper for 10 to 22 AWG Wire and Copper Cable, 3005CR

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