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Barrel Nipple
Inches Metric
N.B. L N.B. L
1/4
3/8
1/2
3/4
1
1¼
1½
2		 1.50
1.50
2.00
2.13
2.38
2.75
2.75
3.13		 8
10
15
20
25
32
40
50		 38
38
51
54
60
70
70
79
barrel nipple diagram
Welding Nipple
Inches Metric
N.B. L N.B. L
1/4
3/8
1/2
3/4
1
1¼
1½
2		 1.50
1.50
2.00
2.13
2.38
2.75
2.75
3.13		 8
10
15
20
25
32
40
50		 38
38
51
54
60
70
70
79
welding nipple diagram
Square Head Plug
Inches Metric
N.B. L N.B. L
1/4
3/8
1/2
3/4
1
1¼
1½
2		 .630
.669
.827
.945
1.063
1.142
1.378
1.378
1.669		 6
8
10
15
20
25
32
40
50		 16
17
21
24
27
29
35
35
43
Square head plug
Hexagon Head Plug
Inches Metric
N.B. L N.B. L
1/8
1/4
3/8
1/2
3/4
1		 .63
.83
.94
1.10
1.22
1.38		 6
8
10
15
20
25		 16
21
24
28
31
35
hexagon head plug