[Tech1] Imperial v. Metric

[Nick Ware]

I’m curious to know where you got that table from. All of the M2.5, 3, 3.5, 4, 5 and M6 bolts that I have, the number refers to the overall thread diameter, not the nut size. A but in any given nut and bolt pair, the nut can vary a lot. The right spanner to use is the one that fits!
Cheers,
Nick.

Nick Ware - sent from my iPad

On 14 Jun 2023, at 17:35, David Newbitt via Tech1 <tech1 at tech-ops.co.uk> wrote:


Indeed Alasdair, 13 mm as you note. Here is the sequence -

Metric Spanner Sizes

Nominal Size
Spanner Size
M1.6
3.2mm
M2
4mm
M2.5
5mm
M3
5.5mm
M3.5
6mm
M4
7mm
M5
8mm
M6
10mm
M7
11mm
   M8  *
       *13mm
M10
17mm
M12
19mm
M14
22mm
M16
24mm
M18
27mm
M20
30mm
M22
32mm
M24
36mm

Dave Newbitt.




From: Alasdair Lawrance via Tech1
Sent: Wednesday, June 14, 2023 2:14 PM
To: Graeme Wall
Cc: Tech Ops List
Subject: Re: [Tech1] Imperial v. Metric

Dealing (as I used to do, anyway), with ancient BMC diesels, and assorted other more obscure makes, it was fine when everything went metric.

One wrinkle that did come up regularly was a 8mm ø thread which some manufacturers deemed a 12 mm spanner, and others a 13mm (across flats).  13mm (AF) is the correct ISO size.

Alasdair Lawrance
alawrance1 at me.com

Don’t blame me, I voted Remain.










On 13 Jun 2023, at 12:13, Graeme Wall via Tech1 <tech1 at tech-ops.co.uk> wrote:

Converting to the metric system had nothing to do with the EU, we started the process over 100 years ago.

On 13 Jun 2023, at 12:10, Pat Heigham via Tech1 <tech1 at tech-ops.co.uk> wrote:

Hi all,
Something to consider.....
If we have really exited the European Union, should there not be a move to restore Imperial Measures?
We seem to have an amalgam of complicated mixture.
We talk about MPG for cars, but the fuel is dispensed in litres.
Pubs still serve beer in pints. Although the bottles are in ml.
Doctors measure us in centimetres and weigh us in Kg.
Grocers and butchers were forced to alter their scales and tills to become metric.
But now to change currency back would not be good - decimal coinage works OK,
easier to understand (as in the USA) and our little ones are not Vorderman or Riley,
when it comes to Maths!
(A Civil Engineer* explained to me that builders work in mm to the nearest 5mm,
so their calculations for quantity surveying always end up as either '5' or '0')
*I knew him well - he made the Post Office Tower stand up - not yet fallen over,
in spite of 'The Goodies' Kitten!
Best
Pat H
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Graeme Wall



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