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Technical Information

SCREW THREAD DATA CHARTS

UNF Thread ANSI B1.1
UNC, UNF, & UNEF Thread ANSI B1.1

UNF Screw Thread per ANSI B1.1

UNF = Unified National Fine 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
Diameter
Major
Diameter
Inch
Major
Diameter
mm
Tapping Drill
Size
mm
TPI Pitch
mm
#0 - 80 UNF 0.0600 1.524 1.25 80 0.317
#1 - 72 UNF 0.0730 1.854 1.55 72 0.353
#2 - 64 UNF 0.0860 2.184 1.90 64 0.397
#3 - 56 UNF 0.0990 2.515 2.15 56 0.453
#4 - 48 UNF 0.1120 2.845 2.40 48 0.529
#5 - 44 UNF 0.1250 3.175 2.70 44 0.577
#6 - 40 UNF 0.1380 3.505 2.95 40 0.635
#8 - 36 UNF 0.1640 4.166 3.50 36 0.705
#10 - 32 UNF 0.1900 4.826 4.10 32 0.794
#12 - 28 UNF 0.2160 5.486 4.70 28 0.907
1/4" - 28 UNF 0.2500 6.350 5.50 28 0.907
5/16" - 24 UNF 0.3125 7.938 6.90 24 1.058
3/8" - 24 UNF 0.3750 9.525 8.50 24 1.058
7/16" - 20 UNF 0.4375 11.112 9.90 20 1.270
1/2" - 20 UNF 0.5000 12.700 11.50 20 1.270
9/16" - 18 UNF 0.5625 14.288 12.90 18 1.411
5/8" - 18 UNF 0.6250 15.875 14.50 18 1.411
3/4" - 16 UNF 0.7500 19.050 17.50 16 1.587
7/8" - 14 UNF 0.8750 22.225 20.40 14 1.814
1" - 12 UNF 1.0000 25.400 23.25 12 2.117
1-1/8" - 12 UNF 1.1250 28.575 26.50 12 2.117
1-1/4" - 12 UNF 1.2500 31.750 29.50 12 2.117
1-3/8" - 12 UNF 1.3750 43.925 32.75 12 2.117
1-1/2" - 12 UNF 1.5000 38.100 36.00 12 2.117
UNF 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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