# The Weights and Measures Regulations 1963, Regulation 51


(1) The adjusting holes in weights made of iron other than those of the flat-circular type, shall be rectangular or circular, and shall not be greater in area than the area of a rectangle of the following approximate dimensions:—
Purported value of weight
Length
Width
Approximate minimum distance of lead from surface when new
inches
inches
inches
56 pounds
2½
1¼
1¼
50 pounds
2½
1¼
1¼
28 Pounds
2
1
1
20 Pounds
1½
¾
¾
14 pounds
1¼
⅝
⅝
10 pounds
1
½
½
7 pounds
1
½
½
5 pounds
¾
½
½
4 pounds
¾
½
½
2 pounds
⅝
½
½
1 pounds
⅝
½
½
8 ounces
⅝
⅜
¼
4 ounces
½
5 16
¼
(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/51 (the official version)
Page: https://openlegislation.uk/weights-and-measures-regulations-1963/regulation-51
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.