Wire size mystery

Nov 26, 2008
1,970
Endeavour 42 Cruisin
I have some wire that is labeled "marine sae j378b and j1128" but there is no awg marking on any of it. Have over 10' and it appears to be at least 12 ga and maybe as big as 8 ga. How do I determine gauge?
 
Jul 7, 2004
8,481
Hunter 30T Cheney, KS
I came up with this when I Googled those numbers. They appear to be spec numbers. not gauges. SAE J1128 (Type GPT), SAE J378B.
A wire stripper may help you with the size
 
Nov 26, 2008
1,970
Endeavour 42 Cruisin
Yes, I googled the numbers and came up with standards.
I dont have a stripper for bigger than 12 ga. This does appear bigger than 12 ga by that measure but not 100% sure hpw accurate I can be with that.
 

capta

.
Jun 4, 2009
4,909
Pearson 530 Admiralty Bay, Bequia SVG
If it isn't tinned wire I'm not sure you'd want to use it aboard anyway.
 
Nov 26, 2008
1,970
Endeavour 42 Cruisin
Its labeled marine grade and meets sae standards for marine engine wiring. Are you saying there are wires that meet these standards that are not tinned?
 
Jul 7, 2004
8,481
Hunter 30T Cheney, KS
Where is it used? I have some 10ga but nothing larger except for on the batteries.
 
Nov 26, 2008
1,970
Endeavour 42 Cruisin
It is not in use. Doing some rewiring and need a bit of 8 ga. This would be perfectly fine if it is 8ga
 
Nov 26, 2008
1,970
Endeavour 42 Cruisin
The bike ride to the hardware store yesterday just about killed me. Lots of hills...and no other transpo.
And marine supply stores are at least double the distance.
 

kito

.
Sep 13, 2012
2,011
1979 Hunter Cherubini 30 Clemmons
8 gauge wire is .1285 diameter and 10 gauge is .1019 per my handy chart I use at work.
 

kito

.
Sep 13, 2012
2,011
1979 Hunter Cherubini 30 Clemmons
Are you measuring the bare wire? 6 gauge is.1620 and 7 is .1443. These are the diameters for single strand solid wire. The tinned stranded wire used in marine applications may measure differently.....not sure.
 
Nov 26, 2008
1,970
Endeavour 42 Cruisin
Yes, bare wire. Sliced a bit of jacket and pulled it back a bit to keep wire round, measured in that gap in the jacket. It is stranded so I suspect it would measure different than single strand