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Tool Talk Discussion Forum

7/16 bolts and nuts?

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trw

11-04-2006 15:54:52




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I see there is a "bolt" question a few posts earlier, so I guess I can ask a question about bolts that I have had for a long time. We all know that a 3/8" bolt and nut take a 9/16" wrench and a 1/2" bolt and nut both take a 3/4" wrench. So why did some "enstein" make a 7/16" bolt use a 5/8" wrench and the nut for the 7/16" bolt use a 11/16" wrench? Somebody must know why it was made this way.

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J Schwiebert

11-05-2006 02:05:17




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 Re: 7/16 bolts and nuts? in reply to trw, 11-04-2006 15:54:52  
Have you also in answer to the navy answer of U S Standard and U S heavy nuts?When I was first out of high school I worked this place which had a lot of 3/4 inch bolts. They all took a 1-1/4 wrench. Also a lot of 3/8 bolt when I worked for the implement dealer on stuff made durring and before the Korean war took 5/8 inch wrench. 9-16 inch bolts will take either a 13-16 hex or a 7-8 nut. The older man that explained this all to me died probably close to 15 years ago and if you are only a 20 year old you really did not care. Also there are (were) 2 uses for 11-16 bolts. Why just these two applications? J. Also my first socket set had a 25/32 socket. What did it fit?

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bhb

11-05-2006 05:47:30




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 Re: 7/16 bolts and nuts? in reply to J Schwiebert, 11-05-2006 02:05:17  
If you ever find out what the 25/32 socket fits let me know so I can put it back in my toolbox.
Bill



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big jt

11-04-2006 11:13:56




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 Re: 7/16 bolts and nuts? in reply to bhb , 11-05-2006 05:47:30  
6point 25/32 are just the right size for the rim clamp on WD and WD45 power adjust wheels. Only place I have ever used one.

jt



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trw

11-04-2006 09:30:12




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 Re: 7/16 bolts and nuts? in reply to bhb , 11-05-2006 05:47:30  
I did use a 25/32" socket once. I don't remember if it was maybe before I had a set of metric sockets or maybe the nut was wore down a little and it was the only socket that would fit. It was a long time ago. Has anyone ever seen a 25/32" wrench?



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Slowpoke

11-11-2006 01:15:04




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 Re: 7/16 bolts and nuts? in reply to trw, 11-04-2006 09:30:12  
Yes, I have 25/32 wrenches. I think they are used on left handed British Standard 7/16-18� nuts. Actually, it was probably made to use on some obsolete bolt size that's in the number series like 10-32, 12-24. Seldom if ever seen are 14-20, 16-xx and on up to 30-xx.



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Dusty MI

11-05-2006 05:28:00




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 Re: 7/16 bolts and nuts? in reply to J Schwiebert, 11-05-2006 02:05:17  
J. Schwiebert

The auger bits that my father had with his brace and bit set (before drill motors were common) had numbers on them for the different sizes, number of 16th's, 8 was 1/2 inch ect. Caddy makes a lot of hangers for conduit, some of these have numbers for different size of conduit. After using these for many years I realized on day that these numbers were 1/16th's ie. 8 for 1/2 inch conduit 12 for 3/4 ect.
Anyway were the numbers on the wrenches the same?

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Ol Chief

11-04-2006 18:55:23




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 Re: 7/16 bolts and nuts? in reply to trw, 11-04-2006 15:54:52  
During WW II do not recall any 15/16"nuts being used on 5/8" bolts where I worked on ships.The standard wrench size for 5/8" nuts was 1-1/16".I don't recall seeing any 15/16"nuts until well after the war.On merchant vessels we almost never had the luxury of open end box wrenches like almost every one normally used elsewhere.Ships were issued tools refered to as engineers wrenches and were heavy and clummsy.To add too that the wrenches were numbered and did not have the inch opening size marked on them.I remember being dressed down for not knowing the stupid formula required to convert the inch size to the number wrench required for a given bolt or nut.I think that that system was a hold over from the British system employed prior to the war.Anyway ,we at that time had huge reciprocating steam engines that required very large tools.All of the small bolts and nuts still had to be dealt with using the old heavy open end wrenches.Numbered of course.

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Ryan - WI

11-04-2006 18:03:10




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 Re: 7/16 bolts and nuts? in reply to trw, 11-04-2006 15:54:52  
I am guessing that the hollowness of the nut makes it too weak at 5/8" The bolt is solid so it can take it in that size. Why both aren't made in 11/16" is a good question... Cheaper as the bolt uses less material??



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Joe (Wa)

11-04-2006 17:15:29




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 Re: 7/16 bolts and nuts? in reply to trw, 11-04-2006 15:54:52  
During WWII, submarines were built for the most part with bolt head wrench size 1/16" smaller than nut size, I.E. a 1/2" bolt wrench sz was 3/4" & the nut wrench sz 13/16", 5/8" bolt head was 7/8", nut 15/16", etc. The purpose was to cut down on duplicate wrenches required for any one repair and a quick inventory of tools when the job was completed.

When doing a repair (mostly rattle abatement) outside the pressure hull, the MM got one tool roll with a set of combo wrenches and a large screwdriver for pry bar. When the job was done, the tool roll was laid out on the conning tower deck, instance inventory, Dive! Dive! MM got 1/2 coffee cup of brandy or rum (no shower tho).

BTDT early 60's, Diesel Boats Forever.

Joe

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msb

11-04-2006 17:10:26




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 Re: 7/16 bolts and nuts? in reply to trw, 11-04-2006 15:54:52  
You must be working on an old Ford.



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Gerald J.

11-04-2006 16:38:28




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 Re: 7/16 bolts and nuts? in reply to trw, 11-04-2006 15:54:52  
Long ago, the bolt standards were different.

Besides with different sizes on the bolt and nut, then you only need one set of wrenches to tighten. Otherwise you need two sets to have two of each bolt and nut size.

Gerald J.



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