Vtg Old Antique Size # No 9 Popular Progress Clock Winding Wind Winder Key 4.2mm

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Vtg Old Antique Size # No 9 Popular Progress Clock Winding Wind Winder Key 4.2mm:
$21.99

Thank you for stopping by The Key Boutique!
This listing for for a vintage all brass Popular Progressclock key number 9 (metric) which willfit a square post that is 4.2mm.
The squares on the graph board are each a half inchand that should help in gauging the size of each different key.
Please see below for a detailed explanation ofclock key sizing (Standard Vs. Metric).We have several other kinds of keys listed,both new and old, so be sure tocheck out our items for sale page!We are happy to offer combined shippingwhich should be done automatically upon checkout,but if for some reason it is not, please let me knowand I will get a corrected invoice right over to you!
Shipping: Items will be shipped out as soon as payment is received.Sales Tax: Members from Pa will have to pay 7% sales tax.Thank you for stopping by and be sure to checkback as more keys will always be added.Have a great day!
Reference No. KB3516

Explanation of Clock Key Numbers and Sizes.

Just as there are 2 different numbering systems

throughoutthe world (standard and metric) there

are also 2 different clock key sizesystems, the

English (Standard) and metric (Swiss). They are

very close insizes but moves in different increments.

The standard sizes differ by .2mm persize, and the

metric sizes differ by .25 increments. The Metric scale is asfollows:

Metric

Key No. Size in mm

000 = 1.75

00 = 2

0 = 2.25

1 = 2.5

2 = 2.75

3 = 3

4 = 3.25

5 = 3.5

6 = 3.75

7 = 4

8 = 4.25

9 = 4.5

10 = 4.75

11 = 5

12 = 5.25

13 = 5.5

14 = 5.75

15 = 6

And the Standard scale is as follows:

Standard (Sometimes referred to as ‘English’)

Key No. Size in mm

000 = 2

00 = 2.2

0 = 2.4

1 = 2.6

2 = 2.8

3 = 3

4 = 3.2

5 = 3.4

6 = 3.6

7 = 3.8

8 = 4

9 = 4.2

10 = 4.4

11 = 4.6

12 = 4.8

13 = 5

14 = 5.2

15 = 5.4

As you can see by the size scales, the sizes are close,

andthey intersect at size 3 so a size 3 clock key will fit

both a standard andmetric clock just as it should. The

clock key should fit perfectly over thepost with no ‘play’,

or wiggle room. It should be very snug if a proper fit,but as

you can see in the charts, key No. 2 between the 2 sizes is a

differenceof .05 which is hardly even noticeable, but you will

see some play. This alsomeans you would need to be careful

when purchasing a clock key because if yourclocks winding

post is a standard system 2 (2.8mm), then a metric system no. 2

key will not work because it would be too small to fit over the

post being.05mm smaller than the post itself. The best thing to

do if you are unsure ofthe size you need is to measure the clock’s

winding post that you need a keyfor, and use these guides to help

with your purchase. If you purchase thecorrect number, like I said

above, it will be a perfect fit with no movement onthe post at all,

but both systems move up in such small increments that thenext 2

sizes will also work, so if you need a standard No. 5 key, a standard

No. 6 and 7 key would work as well, though there would be some

movement betweenthe post and the key if not the exact number.

You will also notice that in some sales a key will benumbered

on the body of the key itself, but does not actually fit thedimensions

of that number on either size scale, so you may see a key that is

numbered with a 9, though it is actually a metric 7 and standard 8.

I do notknow why this is though I am looking into it, but please

note that whateversize any key is listed as, that number is based

on the true size of that keyssquare hole.

Thank you again for checking out my items, andhave a great day!