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Technical Information

SCREW THREAD DATA CHARTS

UNC Screw Thread per ANSI B1.1

UNC, UNF, & UNEF Thread ANSI B1.1

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UNC Screw Thread per ANSI B1.1
UNC = Unified National Coarse Screw Thread.
This is one of three graded series: UNC (Unified National Corase); UNF (Unified National Fine); and UNEF (Unified National Extra Fine). The Nominal Major Diameter and Threads-per-inch (Pitch) are defined by ANSI/ASME B1.1 and are the choices for the customary Unified screws and nuts.
Nominal Major Major Tapping TPI Pitch
Diameter Diameter Diameter Drill Size mm
  Inch mm mm  
#1 - 64 UNC 0.0730 1.854 1.50 64 0.397
#2 - 56 UNC 0.0860 2.184 1.80 56 0.453
#3 - 48 UNC 0.0990 2.515 2.10 48 0.529
#4 - 40 UNC 0.1120 2.845 2.35 40 0.635
#5 - 40 UNC 0.1250 3.175 2.65 40 0.635
#6 - 32 UNC 0.1380 3.505 2.85 32 0.794
#8 - 32 UNC 0.1640 4.166 3.50 32 0.794
#10 - 24 UNC 0.1900 4.826 4.00 24 1.058
#12 - 24 UNC 0.2160 5.486 4.65 24 1.058
1/4" - 20 UNC 0.2500 6.350 5.35 20 1.270
5/16" - 18 UNC 0.3125 7.938 6.80 18 1.411
3/8" - 16 UNC 0.3750 9.525 8.25 16 1.587
7/16" - 14 UNC 0.4375 11.112 9.65 14 1.814
1/2" - 13 UNC 0.5000 12.700 11.15 13 1.954
9/16" - 12 UNC 0.5625 14.288 12.60 12 2.117
5/8" - 11 UNC 0.6250 15.875 14.05 11 2.309
3/4" - 10 UNC 0.7500 19.050 17.00 10 2.540
7/8" - 9 UNC 0.8750 22.225 20.00 9 2.822
1" - 8 UNC 1.0000 25.400 22.85 8 3.175
1-1/8" - 7 UNC 1.1250 28.575 25.65 7 3.628
1-1/4" - 7 UNC 1.2500 31.750 28.85 7 3.628
1-3/8" - 6 UNC 1.3750 43.925 31.55 6 4.233
1-1/2" - 6 UNC 1.5000 38.100 34.70 6 4.233
1-3/4" - 5 UNC 1.7500 44.450 40.40 5 5.080
2" - 4-1/2 UNC 2.0000 50.800 46.30 4.5 5.644
2-1/4" - 4-1/2 UNC 2.2500 57.150 52.65 4.5 5.644
2-1/2" - 4 UNC 2.5000 63.500 58.50 4 6.350
2-3/4" - 4 UNC 2.7500 69.850 64.75 4 6.350
3" - 4 UNC 3.0000 63.500 71.10 4 6.350
3-1/4" - 4 UNC 3.2500 82.550 77.45 4 6.350
3-1/2" - 4 UNC 3.5000 88.900 83.80 4 6.350
3-3/4" - 4 UNC 3.7500 95.250 90.15 4 6.350
4" - 4 UNC 4.0000 101.600 96.50 4 6.350
UNC Screw Thread

Disclaimer:
This data is provided for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. If accuracy is critical, base your final decisions on the data provided in the root document: ANSI/ASME B1.1:2003; which is a copyrighted document. To purchase a copy visit an Authorized Reseller.

Comments:
Original Posting: 7/14/2009
Last Revision: 5/16/2016
Error corrections in, or comments about, the above data can be sent to: gageguy@gagecrib.com

 

 

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