Pipe Thread Specifications
British standard Thread     
UNF Thread
     NPT Thread
British Standard
Pipe Threads
UNF & UNF Taper Threads
      NPT Threads
     Torque specification for plastic threads: There is no overall torque specification for plastic
     threads - As general rule, tighten plastic threads to "finger tight" plus 1 1/2 turns.

   »» Sampling of parts for thread fit is recommended since the dimensional tolerance
        varies for different resin materials

  Drawings are provided for comparison only. Appearance and size of drawings depends  on viewing monitor's resolution
  Drawings should be close to actual size @ 1024 x 768   resolution. Please See notes below drawings*


1032 UNF

 1032T UNF

1/4–28 UNF

1/16" NPT

1/8" NPT

1/4"NPT

3/8"NPT

1/2"NPT

3/4"NPT

1"NPT

*Data presented is for reference only. Customer applications and conditions of use are beyond our control; therefore, it is imperative that customers test Eldon James products in their specific application to determine suitability.

We are happy to provide limited numbers of free samples for this purpose.

Unified National Fine (UNF) Threads
Society of Automotive Engineers (SAE) Threads
Thread
Thread
Length In.
Thread
Type
Threads
Per Inch
Pitch Dia.
Start of
Ext. Thread
1032
1/4"
UNF
32
.1658
1032T
3/8"
UNF Taper
32
–
1/4 – 28
3/8"
UNF
28
.2208
EJ – National Standard Taper Pipe Thread (NPT)
EJ Thread
Size Number
Thread
size
Thread
Type
Threads
Per Inch
Pitch Dia.
Start of
Ext. Thread
11/16" NPT270.27118
21/8" NPT270.36351
41/4" NPT180.47739
63/8" NPT180.61201
81/2"NPT140.75843
123/4"NPT140.96768
161" NPT11.51.21363
EJ – British Standard Pipe Thread (BSPT)
EJ Thread
Size Number
size
Thread
Type
Threads
Per Inch
Pitch Dia.
Start of
Ext. Thread
2B1/8" BSPT280.3601
4B1/4" BSPT190.4506
6B3/8" BSPT190..5886
8B1/2"BSPT140.7336
12B3/4"BSPT140.9496
16B1" BSPT111.1926

   Torque specification for plastic threads: There is no overall torque    specification for plastic  threads - As general rule, tighten plastic threads
    to - finger tight plus 1 1/2 turns.
Updated 6/2003