[Elecraft] understanding screw sizes

[Bob]

Hi Pete,

             Well sort of...  The tank and some Amal carb stuff did but the bike 
itself had BSC
(British Standard Cycle) threading.  It was based on Whitworth thread angles but was
a fine thread system that "most"  of were 26tpi.   Then of course there are your BA
(British Association) threads that were used for small screws on the electrical 
items.
These were actually based on old French metric threads, not Whitworth....

             That is how it was even on my 1st, a 47 Ariel.  And ones I still 
have,  Norton,
Matchless, Royal Enfield,  and my older Triumphs.

73,
Bob
K2TK   ex KN2TKR (1956) & K2TKR

On 4/9/2011 1:10 PM, Pete F5VNB wrote:
> Whitworth? Luxury!
> My first motorcycle, a Triumph, had nuts with a BSP thread - British
> Standard Pipe.
>
> 73, Pete G4PLZ/F5VNB
>
>
> On 09/04/2011 17:02, Kevin Rock wrote:
>> No one has mentioned the other set of tools required to work on British
>> bikes: Whitworth.  Yes, I have three sets of tools to work on American,
>> Japanese, and British gear.  Now tell me how the threads are the same on
>> metric bolts from across the world.  From what I have learned there is no
>> standard for metric threads.  German and Japanese equipment do not
>> necessarily use interchangeable hardware.
>>        73,
>>           Kevin.  KD5ONS
>>
>>
>> On Sat, 09 Apr 2011 07:43:40 -0700, Matt Zilmer<mzilmer at verizon.net>
>> wrote:
>>
>>> Small addition / correction.
>>>
>>> Nearly all consumer electronics is produced using metric hardware,
>>> mainly because it comes from Asian sources.  With the exception of the
>>> odd drive types (Torx, one-way, etc.), the sizes roughly approximate
>>> the American standards in terms of TPI, torque settings, etc.
>>>
>>> As Don points out, one has to have a double set of tools for some of
>>> this, but generally a screwdriver is a screwdriver.  Nutdrivers and
>>> sockets, nope.
>>>
>>> I was forced many years ago to buy dual sets of combination wrenches
>>> and 3/8" / 1/2" inch sockets for automotive work I did as a hobby.  If
>>> you do this, buy Craftsman or Snap On.
>>>
>>> 73,
>>> matt
>>>
>>>
>>> On Sat, 09 Apr 2011 08:43:22 -0400, you wrote:
>>>
>>>>    Pf,
>>>>
>>>> Most of the screws in the K3 are #4, and the thread size is in turns per
>>>> inch (4-40).  These are standard sizes here in the US - no metric size
>>>> hardware is used in the K3 as far as I know.
>>>> You have the reference link correct.
>>>>
>>>> There is also some #2 hardware used in the K3 - it is the smaller
>>>> diameter, and has 56 threads per inch (2-56).
>>>>
>>>> #6 hardware has a larger diameter and will have 32 threads per inch
>>>> (6-32)
>>>>
>>>> The length of the screw threads will change depending on whether the
>>>> head is flat or not.  For flathead screws, measure the entire length of
>>>> the screw including the head.  For the others, measure from the head to
>>>> the end of the screw.
>>>>
>>>> The washers are designated by the size of the hole.  Other dimensions
>>>> may exist if important, but often just the hole size and the washer type
>>>> (flat, internal tooth lockwasher, split lockwasher) suffice for the
>>>> description.
>>>>
>>>> Sorry for those in "Metric Land" who do not understand the US hardware
>>>> system.  We tried to go metric many years ago and failed.  Most of the
>>>> auto industry is now metric, but for small hardware, the US sizes
>>>> predominate here.  We have to keep two sets of wrenches if we are to
>>>> have a complete set.
>>>>
>>>> 73,
>>>> Don W3FPR
>>>>
>>>> On 4/9/2011 1:51 AM, Pierfrancesco Caci wrote:
>>>>> Hello,
>>>>> while lenght of the screws is given in the manual in mm also, I'm
>>>>> trying to figure out how to read the screw and washer diameters
>>>>> that are given as "4-40" and such. Is this the relevant standard?
>>>>> http://en.wikipedia.org/wiki/Unified_Thread_Standard
>>>>>
>>>>> For washers, the first number should be the size of the hole, right?
>>>>>
>>>>> Pf
>