Thread: Metric or Imperial?

Originally Posted by Dougal

What's a K nut?

I've looked for M10x1.0 before and came up empty. I may have cut and rethreaded long shank M10 coarse. What's your application? Cut threads are of course weaker in fatigue than rolled threads. But you can machine down the shank to stress-relieve the first thread going in. Exactly the same reasons as waisting down drive axles.

Grade 12.9 I go straight to SHCS.

Aerospace nut, reduced hex, (lightweight) flange base, all metal locking, almost infinitely reusable.

The rich man's nyloc, used to use them on race cars all the time, still have a bag full of moly coated ones in 5/16, used all my 3/8 ones on the prop shaft retaining bolts

AFAIK all SHCS are 1.5 pitch in M10 ?

I'm servicing a locker and it uses those bolts in 30 and 40mm lengths respectively, tensioned to 14kgf/137NM so I don't really want to reuse them.

Originally Posted by rick130

No, it's what the bolt actually is !
I can't remember what the hex size is, but I know it's a 3/8UNF bolt.

If you buy a bolt or nut you buy by the thread dimension, not the hex size.

He doesn't want to but a "bolt" or a nut , ( its technically only a bolt when used with a nut ) he wants tool buy TOOLS, imagine going into a shop and asking for a socket to remove a 3/8 unf nut, you would have the young fella's scratching their heads , Its not whitworth .

Originally Posted by chopper

He doesn't want to but a "bolt" or a nut , ( its technically only a bolt when used with a nut ) he wants tool buy TOOLS, imagine going into a shop and asking for a socket to remove a 3/8 unf nut, you would have the young fella's scratching their heads , Its not whitworth .

Old !!! - Whitworth used the tool size for size of the shank, a system invented for practical purposes, with the length of a spanner designed to give the correct torque to the shank by hand pressure and before this system came into being, most fittings were hand made to suit the application .

UNF and UNC use AF sized tools, think of that being the size being the measurement Across the Flats of the hex of stud, bolt or nut.

The two measurement systems caused no end of confusion between the spare parts bloke and yours truly, as a young wet behind the ears when searching after parts while working on the farm's early machinery including the Land Rover, then needing something for the Fergy tractor.

Still have the old Whitworth sockets from the farm and even today I still can't see the size markings on them as they were worn off years before I got to use them.
.

Originally Posted by wrinklearthur

Old !!! - Whitworth used the tool size for size of the shank, a system invented for practical purposes, with the length of a spanner designed to give the correct torque to the shank by hand pressure and before this system came into being, most fittings were hand made to suit the application .

UNF and UNC use AF sized tools, think of that being the size being the measurement Across the Flats of the hex of stud, bolt or nut.

The two measurement systems caused no end of confusion between the spare parts bloke and yours truly, as a young wet behind the ears when searching after parts while working on the farm's early machinery including the Land Rover, then needing something for the Fergy tractor.

Still have the old Whitworth sockets from the farm and even today I still can't see the size markings on them as they were worn off years before I got to use them.
.

I hate Whitworth head sizing with a vengeance, and I still cop it a lot on what I work on.
The threadform is very clever though from a fatigue/stress POV.

The problem with Whitworth was they tinkered with it. During WW2 one of the bolt head sizes was reduced to save steel.

At which point all usefulness evaporated. How much steel did they waste supplying new spanners to go with the new bolt head size?

My Gardner 6LX engines are Whitworth and i love them with a passion, and they will still be going when we are all compost.
New fangled AF & Metric, Bah

Are we off topic yet ?

Originally Posted by AndyG

Are we off topic yet ?

Was going to say , what have I started ? ! .
Whitworth rhymes S-hitworth