- Dimensions per ANSI/ASME B16.9.
- T = Pipe wall and lap thickness.
- A lap joint is useful when the alignment of bolt holes is difficult, as when spools are to be attached to flanged nozzles of vessels.
| Pipe Size (NPS) | M | N | P STD | P XS | R | Approx. Weight (lb) |
|---|
| STD | XS |
|---|
| 1/2 |
3 |
1 3/8 |
0.109 |
0.147 |
1/8 |
0.3 |
0.4 |
| 3/4 |
3 |
1 11/16 |
0.113 |
0.154 |
1/8 |
0.4 |
0.5 |
| 1 |
4 |
2 |
0.133 |
0.179 |
1/8 |
0.7 |
0.9 |
| 1 1/4 |
4 |
2 1/2 |
0.140 |
0.191 |
3/16 |
1.0 |
1.2 |
| 1 1/2 |
4 |
2 7/8 |
0.145 |
0.200 |
1/4 |
1.1 |
1.5 |
| 2 |
6 |
3 5/8 |
0.154 |
0.218 |
5/16 |
2.2 |
3.1 |
| 2 1/2 |
6 |
4 1/8 |
0.203 |
0.276 |
5/16 |
3.5 |
4.6 |
| 3 |
6 |
5 |
0.216 |
0.300 |
3/8 |
4.7 |
6.3 |
| 3 1/2 |
6 |
5 1/2 |
0.226 |
0.318 |
3/8 |
5.6 |
7.7 |
| 4 |
6 |
6 3/16 |
0.237 |
0.337 |
7/16 |
6.8 |
9.3 |
| 5 |
8 |
7 5/16 |
0.258 |
0.375 |
7/16 |
11.8 |
16.7 |
| 6 |
8 |
8 1/2 |
0.280 |
0.432 |
1/2 |
15.3 |
23.0 |
| 8 |
8 |
10 5/8 |
0.322 |
0.500 |
1/2 |
23.0 |
35.0 |
| 10 |
10 |
12 3/4 |
0.365 |
0.500 |
1/2 |
40.0 |
53.0 |
| 12 |
10 |
15 |
0.375 |
0.500 |
1/2 |
49.0 |
64.0 |
| 14 |
12 |
16 1/4 |
0.375 |
0.500 |
1/2 |
63.0 |
84.0 |
| 16 |
12 |
18 1/2 |
0.375 |
0.500 |
1/2 |
73.0 |
97.0 |
| 18 |
12 |
21 |
0.375 |
0.500 |
1/2 |
85.0 |
112.0 |
| 20 |
12 |
23 |
0.375 |
0.500 |
1/2 |
94.0 |
126.0 |
| 22 |
12 |
25 1/4 |
0.375 |
0.500 |
1/2 |
99.0 |
133.0 |
| 24 |
12 |
27 1/4 |
0.375 |
0.500 |
1/2 |
116.0 |
152.0 |
