Re: Microscope Fasteners

On 29 Jan 2006 00:35:43 -0800, "Too_Many_Tools"
<too_many_tools@xxxxxxxxx> wrote:

>I recently received an old Nikon microscope that was built in the
>1960's. It had been damaged and needed several of the fasteners
>(screws) replaced. When I went to replace them, I find that the metric
>screws (3m x 0.5) available at the local Ace Hardware will not fit
>(right diameter, wrong pitch?). As it was explained to me by the
>helpful gentleman there, there apparently is a DIN and a ISO metric
>standard and apparently the Nikon microscope needed the "other"
>standard.
>
>Could someone explain the details to this strange situation?
>
>What fasteners does an old Nikon 60's scope use and where does one find
>them?
>
>Also if possible, an overview of what scope manufacturers used what
>type of fasteners would be appreciated since I do have a number of
>different scopes that I expect to modify in the future.
>
>Thanks
>
>TMT

The metric screws are fully designed by their diameter and pitch. If
you ask a metric screw giving its diameter only, you will obtain the
'normal' pitch. For a metric screw of 3 mm of diameter, the normal
pitch is 0.5, but there are other pitches. With a microscope, it
should be easy to determine the pitch of that screw. (Check also that
the hole is free).

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