# The Weights and Measures Regulations 1963, Regulation 52


(1) The adjusting holes in weights other than weights made of iron shall be circular and of the following approximate dimensions:—
Purported value of weight
Diameter
Depth
Approximate minimum distance of lead from surface when new
inches
inches
inches
Other than flat-circular shape:—
56 pounds
1½
2
1
50 pounds
1½
2
1
28 pounds
1
1½
¾
20 pounds
1
1½
¾
14 pounds
1
1½
¾
10 pounds
¾
1
½
7 pounds
¾
1
½
5 pounds
¾
1
½
4 pounds
¾
1
½
2 pounds
¾
1
½
1 pound
½
¾
⅜
8 ounces
½
¾
⅜
4 ounces
⅜
⅝
¼
2 ounces
⅜
⅝
¼
1 ounce
¼
⅜
3 16
Flat-circular shape:—
4 pounds
¾
⅗ths centre thickness of weight
⅕th centre thickness of weight
2 pounds
¾
⅗ths centre thickness of weight
⅕th centre thickness of weight
1 pound
¾
⅗ths centre thickness of weight
⅕th centre thickness of weight
8 ounces
½
⅗ths centre thickness of weight
⅕ths centre thickness of weight
4 ounces
½
⅗ths centre thickness of weight
⅕ths centre thickness of weight
2 ounces
¼
⅗ ths centre thickness of weight
⅕ths centre thickness of weight
1 ounce
¼
⅗ths centre thickness of weight
⅕ths centre thickness of weight
(2) The minimum distance of the lead (when new) from the surface of the weight shall correspond approximately to that specified in the fourth column of the foregoing table.

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Source: https://www.legislation.gov.uk/uksi/1963/1710/regulation/52 (the official version)
Page: https://openlegislation.uk/weights-and-measures-regulations-1963/regulation-52
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.