A few corrections on my comments and the Wikipedia articles.
 
VESA is an organization with many specs.  This is the Flat Display Mounting 
Interface, FDMI.  The various parts have display size and mass limits.  There 
are parts B and C for small devices (GPS plotters, instrument display?) less 
than 303 mm, 4.5 kg max.  For flat panel displays, TV's:
 
Part D:  583 mm (diagonal) max, 14 kg max.  Hole pattern 100 mm x 100 mm (75 x 
75 mm allowed, < 8 kg).  M4 hardware.
 
Part E: 786 mm max, 22.7 kg max.  Hole pattern (6 hole) 200 mm x 100 mm, M4 
hardware.

Part F: 2286 mm max, 113.6 kg max.  Multi-hole pattern determined by 
manufacturer, minimum 200 mm x 200 mm, display manufacturer chooses hole 
pattern and number of holes (at least 4), symmetrical about both centerlines, 
on 100 mm grid.  All holes provided by display manufacturer must be used by 
mount.  Hardware: M8, but M6 may be used below 50 kg.  
 
Spec is downloadable on the web and MUCH more involved.  The above is just a 
synopsis.  The above are the center patterns which are the preferred, and most 
common.  There are also edge mount patterns, which are different dimensions.  
Know what pattern is on the back of the TV, then choose a mount, especially for 
Part F which has MANY variants.
 
--- On Tue, 9/6/11, James Frysinger <[email protected]> wrote:


From: James Frysinger <[email protected]>
Subject: [USMA:51087] Re: TV mounting bracket
To: "U.S. Metric Association" <[email protected]>
Date: Tuesday, September 6, 2011, 5:13 PM


Neat! Thanks, John.

Jim


-- 
James R. Frysinger
632 Stony Point Mountain Road
Doyle, TN 38559-3030

(C) 931.212.0267
(H) 931.657.3107
(F) 931.657.3108

On 2011-09-06 16:00, John M. Steele wrote:
> There is a spec for the flat screen and the part of the mount that
> connects to it, known as VESA. This Wikipedia article gives a decent
> overview:
>
> http://en.wikipedia.org/wiki/Flat_Display_Mounting_Interface
> The part of the mount that connects to the wall is left to the 
> manufacturer.
> The original mount patterns were all square, but rectangular spacings
> were added as displays got larger. I don't think M5 is part of the spec
> however.
> --- On *Tue, 9/6/11, James Frysinger /<[email protected]>/* wrote:
>
>
>     From: James Frysinger <[email protected]>
>     Subject: [USMA:51085] TV mounting bracket
>     To: "U.S. Metric Association" <[email protected]>
>     Date: Tuesday, September 6, 2011, 3:54 PM
>
>     We have just purchased a TV wall-mounting bracket at Costco for a
>     flat-screen TV that we also purchased there. The bracket is made by
>     Simplicity. This presents a mixture of metric and non-metric
>     hardware dimensions and directions.
>
>     Apparently, all the fasteners that mount the TV to the mounting
>     bracket are metric and provision is made for four diameters (M4, M5,
>     M6, and M8 -- i.e., diameters given in millimeters) with lengths
>     ranging from 12 mm to 45 mm (not all lengths available in all four
>     diameters). The lag screws that mount the bracket to the wall are
>     non-metric: 5/16 by 2.75 in. Of course, the hole spacing on the
>     backs of these flat screen TVs are all metric (e.g., 100 mm, 200 mm,
>     400 mm, 450 mm), but here the directions give rough non-metric
>     equivalents (4 in, 8 in, 16 in, 18 in). The spacers (to allow
>     protrusion on the backs of the TVs) are 14 mm and 24 mm in depth;
>     one selects the needed length or none, per the TV's design.
>     Necessary bit sizes are given as 5.5 mm (7/32 in) and 10 mm (3/8
>     in). I suspect that many cheap drill bit sets do not include a 7/32
>     in bit. I also suspect that most Americans don't realize that size
>     falls between the 3/16 and 1/4 sizes they possess. That's the size
>     needed for mounting to studs, so there might be some dangerous
>     errors committed in their homes by using a terribly wrong pilot hole
>     size. (The 10 mm bit is for pilot holes in concrete which are then
>     lined with plastic inserts.)
>
>     Directions for hole depths, swing room allowances, etc. are given in
>     both metric and non-metric dimensions: 75 mm, 3 in; 3.72 in, 94.5 mm
>     in the figures; in the text, the non-metric dimensions for holes and
>     bit sizes are in parentheses, but for the swing allowance the metric
>     is in parentheses.
>
>     Directions follow the English directions in French and Spanish, but
>     referring back to the pictures in the English section. For the most
>     part the dual dimensioning practices mentioned above are still
>     followed -- e.g., 3 po (for pouces) and 3 pulgadas.
>
>     Language differences will persist for millenia, perhaps, but in the
>     meantime we could simplify our lives if everyone would use only
>     metric units of measure.
>
>     Jim
>
>     -- James R. Frysinger
>     632 Stony Point Mountain Road
>     Doyle, TN 38559-3030
>
>     (C) 931.212.0267
>     (H) 931.657.3107
>     (F) 931.657.3108
>

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