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UNJ Thread Specifications and Compatibility

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Thread Types and Features: UNJ is a basic UN thread with external thread root radius control
External UNJ threads have root radius between 0.15011p and 0.18042p
Internal UNJ threads have larger minor diameter than standard UN
UNJ threads are Class-of-Fit 3A/3B, UN is Class-of-Fit 2A/2B
Compatibility and Installation: UNJ and UN bolts can fit into each other without problems
UNJ bolts into UN nuts may cause interference fit
Internal UNJ threads require larger drill bit size
External UNJ holes can be created by enlarging standard UN holes
Measurement Tools: UNJ gages use standard UN gages with UNJ handle
UNJ GO ring gage has enlarged minor diameter
UNJ NOGO ring gage is identical to standard UN NOGO
Set plug gages are identical to standard UN set plugs
Important Notes: External thread root radius must blend smoothly with flanks
Internal thread root radius option available but not officially codified
Threads are not designed for direct connection
Final decisions should be based on official specifications