Pioneer Pipe - Russel Metals, Inc.

threading
Threading (cont.)
NPS
Table 4 Coupling Thread Dimensions—Taper-Tapped (NPT) Recessed for Extra-Strong and Double-Extra-Strong Pipe
(Dimensions conform to Line Pipe Couplings in accordance with API 5L) A
Threads/in.
Outside diameter, in.
W
Coupling min length, in.
NL
Pitch diameter, in. (E 1
)
Handtight engagement
1
/8 27 0.563 1 1 /16 0.3736
1
/4 18 0.719 1 5 /8 0.4916
3
/8 18 0.875 1 5 /8 0.6270
1
/2 14 1.063 2 1 /8 0.7784
3
/4 14 1.313 2 1 /8 0.9889
1 11 1 /2 1.576 2 5 /8 1.2386
1 1 /4 11 1 /2 1.900 2 3 /4 1.5834
1 1 /2 11 1 /2 2.200 2 3 /4 1.8223
2 11 1 /2 2.750 2 7 /8 2.2963
2 1 /2 8 3.250 4 1 /8 2.7622
3 8 4.000 4 1 /4 3.3885
3 1 /2 8 4.625 4 3 /8 3.8888
4 8 5.000 4 1 /2 4.3871
5 8 6.296 4 5 /8 5.4493
6 8 7.390 4 7 /8 6.5060
8 8 9.625 5 1 /4 8.5000
10 8 11.750 5 3 /4 10.6209
12 8 14.000 6 1 /8 12.6178
14 8 15.000 6 3 /8 13.8726
16 8 17.000 6 3 /4 15.8758
18 8 19.000 7 1 /8 17.8750
20 8 21.000 7 5 /8 19.8703
Outside diameter tolerances: For sizes 1 1 /2 and under +0.015 -0.031 in.
2 in. and over ±1%
Stand off tolerances:
±1 thread
Legal Notice: This brochure is intended for general information only. Pioneer makes no warranty or representation, expressed or implied, of any kind with respect to the information
contained herein and shall in no event assume liability or responsibility for any loss, damage or injury whatsoever resulting from the use of this information. In all cases, the customer
is therefore requested to use this information at its own risk and responsibility.
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