Maybe the dumbest question...

[fireplug]

of the day, month, year, ever?

As dumb as it is, I haven't found it asked before. Without taking my banjo bolt out of the caliper when deciding whether it is 10mm (10 bolt) or 3/8" (D44) are you guys measuring the diameter of the threads or the head of the bolt?

Measuring the head of the bolt is done as a bolt size indicator but it isn't a recognized standard.

My bolt's head is 1/2 inch which leads me to believe it will be a 3/8 inch diameter staying with the imperial system. Sound right?

 

[Big Blzn]

Size should be the treaded portion of the bolt.

 

[Chevy305]

typically this is the usual configuration:

1/4" bolt = 7/16" head
5/16" bolt = 1/2" head
3/8" bolt = 9/16" head
7/16" bolt = 5/8" head
1/2" bolt = 3/4" head

thats kinda the rule of thumb for generic hardware, but there are many different head sizes for 1 bolt size.

does that answer your question?

 

[fireplug]

I guess my question is;

Does anyone with a confirmed 7/16" banjo bolt have a 1/2" head on said bolt?

my banjo bolt has a 1/2" head on it.

Being that it is a D44, from all the searches I've done it should be a 7/16" but when people are calling it a 7/16 do they mean the head or the diameter of the thread.

I'm confused because with a 1/2" head like Chevy305 mentioned, it indicates a 5/16" thread diameter which is not the expected 7/16"

I guess I'll measure the head and make sure it's not 13mm. If it is I might not have a D44 after all...

EDIT - well I measure using the caliper, not realizing that 13mm and 1/2" are as close in decimal equivalents as they are socket size LOL. Give a little rust on the head and it's a toss up. That said I double checked and I've got flat top knuckles. I knew I did but you start questioning yourself.

 

[Chevy305]

Being that it is a D44, from all the searches I've done it should be a 7/16" but when people are calling it a 7/16 do they mean the head or the diameter of the thread.

I'm confused because with a 1/2" head like Chevy305 mentioned, it indicates a 5/16" thread diameter which is not the expected 7/16"

Well the stuff i just listed is typical of what you find in the harware section of Home Depot or something. There are a lot of bolts that differ from the "standard" such as your banjo bolt... And my intake bolts which are a 3/8" bolt with a 3/8" head.

Also keep in mind someone could have mickey moused it with some awkward sized bolt...

 

[tRustyK5]

Banjo bolts won't necessarily have a standard as far as hex size goes. When the bolt is referred to as 10 mm or 7/16"...it is the thread size being referenced.

D44 uses the 7/16" banjo's, 10 bolt and D60 use the M10 banjo's. 10 bolt calipers fit a D44...so I recommend replacing with 10 bolt calipers when they're due. That way you'll have an easier time sourcing them (newer) and if you ever go one ton you'll already have the correct brake lines and banjo's.

Rene

 

[fireplug]

Banjo bolts won't necessarily have a standard as far as hex size goes. When the bolt is referred to as 10 mm or 7/16"...it is the thread size being referenced.

D44 uses the 7/16" banjo's, 10 bolt and D60 use the M10 banjo's. 10 bolt calipers fit a D44...so I recommend replacing with 10 bolt calipers when they're due. That way you'll have an easier time sourcing them (newer) and if you ever go one ton you'll already have the correct brake lines and banjo's.

Rene

Thanks a lot. Good info and a great idea considering I'm about to buy new calipers and invest in some lengthened brake lines. Thanks a ton!

 

[4X4HIGH]

Don't forget that anyone could have changed the calipers from a D44 to a 10 bolt caliper, doubtful but it has been done before. Also don't forget that if you buy 10 bolt calipers you'll also need the 10mm banjo bolt AND the brake lines for a 10 bolt caliper to match the banjo bolt size.

 

[sarasotausmc]

1/2" is closer to 12mm than 13. Just FYI, and not really pertinent to this post.

 

[4X4HIGH]

1/2" is closer to 12mm than 13. Just FYI, and not really pertinent to this post.

I work with these numbers everyday so i'm going to step in and tell you a secret,


13mm = .511"
1/2" = .500"
12 mm = .472"

now which do you find to be closer to 1/2"?

 

[Gravel Maker]

A bolt is not measured by the thread size......

It is measured by the shank size, a 7/16" bolt will have a shank that is 7/16" in diameter but the threads are very slightly smaller, they are however called 7/16". So the real answer is do not measure the threads, measure the shank.

BTW, those are 7/16"......

 

[fireplug]

Thanks again!