NR-UN
 
Mechanical thread forms - External and internal inserts.
UNIFIED (full form) ASME/ANSI B1.1

 REFERENCE l d p
 16NR-20UN 0.629 0.374 0.787
 16NR-24UN 0.629 0.374 0.944

 REFERENCE KM15 PM25 TIN25 TL20          
 16NR-20UN                
 16NR-24UN                

   Normally available for immediate delivery.
   Only available in a limited quantity.