[Elecraft] understanding screw sizes

[Pete F5VNB]

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
>>>>
>>>>
>>>>
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