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Pipe Thread Size

 

Pipe Thread Size (NPT) does not refer to the outside (OD) physical dimension of a pipe or hose. The hose diameter cannot be used as an indication of the thread size on the hose connector fitting. To determine pipe thread size (NPT), measure outside diameter (male threads) or inside diameter (female threads) and then use table below to determine pipe thread size

Measure the outside diameter (O.D.) of the fitting's thread at the very end, round to the closest reference measurement below and note the corresponding NPT size.

 

Nominal Thread Size (NPT)
1/8"
1/4"
3/8"
1/2"
3/4"
1"
Actual O.D. Measurement  
3/8"
1/2"
5/8"
3/4"
1"
1-3/8"




FPT

MPT

M22 - Twist

Measure the inside diameter of thread at "A"; Find figure nearest this dimension in column 2 or 3 of chart. The dimension in column 1 will be your nominal pipe thread size.

Measure the outside diameter of the large portion of the thread at "B"; Find figure nearest this dimension in column 2 or 3 of chart. The dimension in column 1 will be your nominal pipe thread size.

This is a picture of a 22 mm twist connector. There are 2 types used on pressure washers. The most common has a 14 mm seal cone.

 "C" seal cone = 14 mm
 "C" seal cone = 15 mm

 

 

Column 1

Column 2

Column 3

Pipe Thread Size

Approx. (fraction) Inch. 

Actual (decimal) Inch.

1/8

13/32

.405

1/4

35/64

.540

3/8

43/64

.675

1/2

27/32

.840

3/4

1-3/64

1.050

1

1-5/16

1.315

1-1/4

1-21/32

1.660

1-1/2

1-29/32

1.900

Metric Size
Twist Coupler

 

 

14 mm

17/32

.531

15 mm

19/32

.594

22 mm

27/32

.844
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