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.

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