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Standard Weight Designations
Side Upper Leather
HHH	5.5 to 6 oz.
HH	5 to 5.5 oz.
H	4.5 to 5 oz.
HM	4 to 4.5 oz.
M	3.5 to 4 oz.
LM	3 to 3.5 oz.
L	2.5 to 3 oz.
LL	2 to 2.5 oz.

For Plumps of any given weight, place the letter "P" in front of the weight and add one-fourth of an ounce. The above weight designations represent general practice in the Side Upper Leather Division of the U.S. tanning industry. Weights are gauged in the butt area, along the backbone and approximately six inches in. TANNERS COUNCIL OF AMERICA, INC.

Leather Thickness Conversion Chart
Ounces	Milli- meters	Irons	Fractional Inches	Decimal Inches
1	0.40	75	1/64	.016
2	0.80	1.50	1/32	.031
3	1.20	2.25	3/64	.047
4	1.60	3.00	1/16	.063
5	2.00	3.75	5/64	.078
6	2.40	4.50	3/32	.094
7	2.80	5.25	7/64	.109
8	3.20	6.00	1/8	.125
9	3.60	6.75	9/64	.141
10	4.00	7.50	5/32	.156
11	4.40	8.25	11/64	.172
12	4.80	9.00	3/16	.188