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November 1997

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Subject:
Re: Hardware
From:
Ralph Hersey <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Thu, 20 Nov 1997 16:38:21 -0800
Content-Type:
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John M LaFontaine wrote:
>
> According to IPC-A-610, Rev. B, if you are complying with class 2, then you
> cannot mount a lock washer directly on the laminate; you must use a flat
> washer, then the lock washer.  However, 610B only illustrates this for
> split-ring lock washers.  Does this same rule apply to external- or
> internal-tooth lock washers as well?
>
> J. LaFontaine
> Digi International
>
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Yes John,

The flat washer is required for all types of locking washers, split or
internal / external star locking washers.  Flat washers should also be
used under spring washers, such as the "Bellevue" (spelling ??).

Ralph

--
Ralph Hersey

Ralph Hersey & Associates
3885 Mills Way
Livermore, CA 94550-3319
PHN: 510.454.9805
FAX: 510.454.9805
e-mail: [log in to unmask]

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