Blue Seas terminal fuse block on a 5/16" battery stud? - SailNet Community

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Old 10-06-2013
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Blue Seas terminal fuse block on a 5/16" battery stud?

I'm replacing my battery cables, and installing some fuses while I'm at it. I purchased the Blue Seas MRBF terminal fuse blocks, but was surprised to discover that they are sized to fit 3/8 battery terminals. My batteries have 5/16 terminals on both positive and negative, and I'm told that this is quite common. So is it acceptable to use this combination? Or do I need some sort of adapter bushing? Or something else?

Russ
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Old 10-07-2013
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Re: Blue Seas terminal fuse block on a 5/16" battery stud?

I'm thinking I might be able to use

Amazon.com: Pico 0810PT Military Style Top Post Battery Terminal 1 Set Positive and Negative per Package: Automotive Amazon.com: Pico 0810PT Military Style Top Post Battery Terminal 1 Set Positive and Negative per Package: Automotive



which would allow the fuse block to sit on its side, reducing its height, or perhaps

Amazon.com: Sea-Dog 415210-1 Battery Terminal: Automotive Amazon.com: Sea-Dog 415210-1 Battery Terminal: Automotive



which would make the block sit even higher.

Thoughts?
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Old 10-07-2013
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Re: Blue Seas terminal fuse block on a 5/16" battery stud?

Absolutely no wingnuts or nylock nuts.
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Re: Blue Seas terminal fuse block on a 5/16" battery stud?

Quote:
Originally Posted by Rusty123 View Post
I'm replacing my battery cables, and installing some fuses while I'm at it. I purchased the Blue Seas MRBF terminal fuse blocks, but was surprised to discover that they are sized to fit 3/8 battery terminals. My batteries have 5/16 terminals on both positive and negative, and I'm told that this is quite common. So is it acceptable to use this combination? Or do I need some sort of adapter bushing? Or something else?

Russ
On a standard marine post one hole size larger is acceptable just be sure to put a flat washer on top and no wing nuts. If you don't need an adapter don't use it as it adds multiple connection points.

There are literally hundreds of thousands of battery terminations out there with a 3/8 lug on a 5/16 post.. Perfect? No. Deal breaker? No.....
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Re: Blue Seas terminal fuse block on a 5/16" battery stud?

Quote:
Originally Posted by boatpoker View Post
Absolutely no wingnuts or nylock nuts.
Please give us a reference and rational for no Nylocs....
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Re: Blue Seas terminal fuse block on a 5/16" battery stud?

Quote:
Originally Posted by Maine Sail View Post
On a standard marine post one hole size larger is acceptable just be sure to put a flat washer on top and no wing nuts. If you don't need an adapter don't use it as it adds multiple connection points.

There are literally hundreds of thousands of battery terminations out there with a 3/8 lug on a 5/16 post.. Perfect? No. Deal breaker? No.....
Now that's the cheapest and easiest answer of all. Thanks!
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Re: Blue Seas terminal fuse block on a 5/16" battery stud?

Bluesea claims that they are for 5/16" studs:
MRBF Terminal Fuse Block - 30 to 300A - Blue Sea Systems

My battery has M6 bolts instead of studs and I did use a washer as Maine Sail describes.
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Re: Blue Seas terminal fuse block on a 5/16" battery stud?

[QUOTE=Alex W;1100709]Bluesea claims that they are for 5/16" studs:
MRBF Terminal Fuse Block - 30 to 300A - Blue Sea Systems
QUOTE]

What they're referring to there is the size of the stud to which the cable is attached, vice the battery terminal. It's clearer in this diagram:

http://assets.bluesea.com/files/reso...91_drawing.jpg

But I'm good with the washer method if you all are.
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Re: Blue Seas terminal fuse block on a 5/16" battery stud?

Quote:
Originally Posted by Alex W View Post
Bluesea claims that they are for 5/16" studs:
MRBF Terminal Fuse Block - 30 to 300A - Blue Sea Systems

My battery has M6 bolts instead of studs and I did use a washer as Maine Sail describes.
Blue Sea recently changed the size of the fuse stud from 1/4" to 5/16". The hole in the fuse holder, that goes over the battery stud is still 3/8" as it has been since they launched..... Some retailers may still have the old 1/4" post versions...
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Old 10-08-2013
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Re: Blue Seas terminal fuse block on a 5/16" battery stud?

Turns out that a washer wasn't required, because I had to place a lug for a bank connector cable (which has a 5/16 hole) right over it anyway.
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