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Technical Information

SCREW THREAD DATA CHARTS

UNEF Screw Threads per ANSI B1.1

UNC, UNF, & UNEF Thread ANSI B1.1

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UNEF Screw Threads per ANSI B1.1

UNEF = Unified National Extra Fine.
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
#12 - 32 UNEF 0.2160 5.486 4.80 32 0.794
1/4" - 32 UNEF 0.2500 6.350 5.70 32 0.794
5/16" - 32 UNEF 0.3125 7.938 7.25 32 0.794
3/8" - 32 UNEF 0.3750 9.525 8.85 32 0.794
7/16" - 28 UNEF 0.4375 11.112 10.35 28 0.907
1/2" - 28 UNEF 0.5000 12.700 11.80 28 0.907
9/16" - 24 UNEF 0.5625 14.288 13.40 24 1.058
5/8" - 24 UNEF 0.6250 15.875 15.00 24 1.058
11/16" - 24 UNEF 0.6875 17.462 16.60 24 1.058
3/4" - 20 UNEF 0.7500 19.050 18.00 20 1.270
13/16" - 20 UNEF 0.8125 20.638 19.60 20 1.270
7/8" - 20 UNEF 0.8750 22.225 21.15 20 1.270
15/16" - 20 UNEF 0.9375 23.812 22.70 20 1.270
1" - 20 UNEF 1.0000 25.400 24.30 20 1.270
1-1/16" - 18 UNEF 1.0625 26.988 25.80 18 1.411
1-1/8" - 18 UNEF 1.1250 28.575 27.35 18 1.411
1-1/4" - 18 UNEF 1.2500 31.750 30.55 18 1.411
1-5/16" - 18 UNEF 1.3125 33.338 32.10 18 1.411
1-3/8" - 18 UNEF 1.3750 34.925 33.70 18 1.411
1-7/16" - 18 UNEF 1.4375 36.512 35.30 18 1.411
1-1/2" - 18 UNEF 1.5000 38.100 36.90 18 1.411
1-9/16" - 18 UNEF 1.5625 39.688 38.55 18 1.411
1-5/8" - 18 UNEF 1.6250 41.275 40.10 18 1.411
1-11/16" - 18 UNEF 1.6875 42.862 41.60 18 1.411
UNEF 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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