National Gas Thread Gages NGO Thread Gage NGT Thread NGS Thread SGT Thread

National Gas Thread Gages NGO Thread Gage NGT Thread NGS Thread SGT Thread

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National Gas Thread Gage NGO Thread gage

  • NGT, SGT    National Gas Taper Threads
  • NGO         National Gas Outlet Threads
  • NGS         National Gas Straight Threads

NGT = National Gas Taper per ANSI CGA V-1 Specification

NGT screw thread :
Lead
Pitch
Taper
Flank Angles
E0 Pitch Diameter
E1 Pitch Diameter
Major Diameter Truncation
Minor Diameter Truncation

The NGT screw thread connection is intended for transmission of gases.

The NGT is a longer screw thread than the NPT. The NGT minimum effective length is approximately 3 threads longer than the NPT.

The NGT screw thread has tight control of the major and minor diameter truncations

The ANSI CGA V-1 Specification for a complicated screw thread measurement system.
Some have been using the following tapered screw thread gages with full success:
NGT-L1 Taper Screw Thread Ring Gage
NGT-L8 Taper Screw Thread Ring Gage
NGT Crest-Check 6-Step Taper Plain Ring Gage
NGT Root-Check 6-Step Taper Screw Thread Ring Gage
NGT-L1 3-Step Screw Thread Plug Gage
NGT-L9 3-Step Screw Thread Plug Gage
NGT Crest-Check 6-Step Taper Plain Plug Gage
NGT Root-Check 6-Step Taper Screw Thread Plug Gage

This screw thread gauge system requires 3-step L1, L8 and L9 taper screw thread gage members, but most gauge makers only offer Basic-Step members. The 3-Step L1 and L9 plug gauge members are readily available for an extra cost. The 3-Step L1 and L8 taper screw thread ring gages require special gauge blanks and thus usually are available only with extended lead-time and increased price.

This system requires the Root-Check and Crest-Check taper gage members to be made as 6-Step, which is the form that the gauges are quoted by default.

NGT = National Gas Taper per ANSI CGA V-1 Specification
NPT = National Pipe Taper per ANSI B1.20.1 Specification
NGO = National Gas Outlet
ANSI CGA V-1 Specification = CSA B96
ANSI CGA V-1 Specification formerly ANSI B57.1


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