MECHANICAL SQUARES
ASTM A513 and ASTM A500

SIZE	GAUGES
3/4″	18	16	15	14
1″	18	16	15	14	13	12	11	10
1-1/4″	18	16	15	14	13	12	11	10
1-1/2″	18	16	15	14	13	12	11	10	9	8
1-3/4″	18	16	15	14	13	12	11	10	9	8
2″	18	16	15	14	13	12	11	10	9	8	7
2-1/8″		16	15	14	13	12	11	10	9	8
2.170″		16	15	14	13	12	11	10	9	8
2-1/4″		16	15	14	13	12	11	10	9	8
2-1/2″		16	15	14	13	12	11	10	9	8	7
3″		16	15	14	13	12	11	10	9	8

 

STRUCTURAL SQUARES

SIZE	WALLS
2″	1/8	3/16	1/4	5/16
2.25″	1/8	3/16	1/4	5/16
2.5″	1/8	3/16	1/4	5/16
3″	1/8	3/16	1/4	5/16	3/8
3.5″	1/8	3/16	1/4	5/16	3/8
4″	1/8	3/16	1/4	5/16	3/8	1/2
4.5″	1/8	3/16	1/4	5/16	3/8
5″	1/8	3/16	1/4	5/16	3/8	1/2
5.5″	1/8	3/16	1/4	5/16	3/8
6″	1/8	3/16	1/4	5/16	3/8	1/2	5/8
7″	1/8	3/16	1/4	5/16	3/8	1/2	5/8
8″	1/8	3/16	1/4	5/16	3/8	1/2	5/8
9″		3/16	1/4	5/16	3/8	1/2	5/8
10″		3/16	1/4	5/16	3/8	1/2	5/8
12″			1/4	5/16	3/8	1/2	5/8