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Unified Miniature Screw Thread Ring Gages

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Unified Miniature Screw Thread Ring Gages

  • Manufactured per American Standard B.110M 2004
  • Used for watches, instruments and miniature mechanisms
  • Diameter range .30mm to 1.40mm (.0118”-.0551”)
  • Free NIST certificate of accuracy



Size Pitch PD Member Item # Price
0.30 0.080 0.248mm GO UNMRG1 $453.00
0.080 0.234mm NOGO UNMRNG1 $453.00
0.080 0.248mm - 0.234mm DOUBLE END UNMRDE1 $913.00
0.35 0.090 0.292mm GO UNMRG2 $453.00
0.090 0.277mm NOGO UNMRNG2 $453.00
0.090 0.292mm - 0.277mm DOUBLE END UNMRDE2 $913.00
0.40 0.100 0.335mm GO UNMRG3 $453.00
0.100 0.319mm NOGO UNMRNG3 $453.00
0.100 0.335mm - 0.319mm DOUBLE END UNMRDE3 $913.00
0.45 0.100 0.385mm GO UNMRG4 $453.00
0.100 0.369mm NOGO UNMRNG4 $453.00
0.100 0.385mm - 0.369mm DOUBLE END UNMRDE4 $913.00
0.50 0.125 0.419mm GO UNMRG5 $453.00
0.125 0.401mm NOGO UNMRNG5 $453.00
0.125 0.419mm - 0.401mm DOUBLE END UNMRDE5 $913.00
0.55 0.125 0.469mm GO UNMRG6 $453.00
0.125 0.451mm NOGO UNMRNG6 $453.00
0.125 0.469mm - 0.451mm DOUBLE END UNMRDE6 $913.00
0.60 0.150 0.503mm GO UNMRG7 $453.00
0.150 0.483mm NOGO UNMRNG7 $453.00
0.150 0.503mm - 0.483mm DOUBLE END UNMRDE7 $913.00
0.70 0.175 0.586mm GO UNMRG8 $453.00
0.175 0.564mm NOGO UNMRNG8 $453.00
0.175 0.586mm - 0.564mm DOUBLE END UNMRDE8 $913.00
0.80 0.200 0.670mm GO UNMRG9 $453.00
0.200 0.646mm NOGO UNMRNG9 $453.00
0.200 0.670mm - 0.646mm DOUBLE END UNMRDE9 $913.00
0.90 0.225 0.754mm GO UNMRG10 $453.00
0.225 0.728mm NOGO UNMRNG10 $453.00
0.225 0.754mm - 0.728mm DOUBLE END UNMRDE10 $913.00
1.00 0.250 0.838mm GO UNMRG11 $453.00
0.250 0.810mm NOGO UNMRNG11 $453.00
0.250 0.838mm - 0.810mm DOUBLE END UNMRDE11 $913.00
1.10 0.250 0.938mm GO UNMRG12 $453.00
0.250 0.910mm NOGO UNMRNG12 $453.00
0.250 0.938mm - 0.910mm DOUBLE END UNMRDE12 $913.00
1.20 0.250 1.038mm GO UNMRG13 $453.00
0.250 1.010mm NOGO UNMRNG13 $453.00
0.250 1.038mm - 1.010mm DOUBLE END UNMRDE13 $913.00
1.40 0.300 1.205mm GO UNMRG14 $453.00
0.300 1.173mm NOGO UNMRNG14 $453.00
0.300 1.205mm - 1.173mm DOUBLE END UNMRDE14 $913.00


WESTport Gage provides a full range of Unified Miniature Screw Thread Plug Gages per the American Standard B1.10M 2004 and the equivalent ISO Recommendation. This thread designation is also referred to as the UNM Series. The threads in this series are interchangeable with the American, British, Canadian and ISO standardization programs. Unified Miniature Screw thread ring gages are intended for use in watches, instruments, and miniature mechanisms.

The series covers a diameter range from .30mm to 1.40mm (.0118” ‐ .0551”) and supplements the Unified and American thread series. WESTport also manufactures UNM forming taps. WESTport’s team of engineers can assist you with properly selecting the correct type of miniature gage and cutting tools for all of your UNM thread applications.

WESTport Manufactured Products. 24th Anniversary Servicing Industry Worldwide (1989-2013)