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Technical Information

THREAD DATA CHARTS

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

UNF Thread ANSI B1.1

UNF - Unified National Fine Thread. Similar to UNC. UNC and UNF threads 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 0,060 1,524 1,25 80 0,317
1 - 72 UNF 0,073 1,854 1,55 72 0,353
2 - 64 UNF 0,068 2,184 1,90 64 0,397
3 - 56 UNF 0,099 2,515 2,15 56 0,453
4 - 48 UNF 0,112 2,845 2,40 48 0,529
5 - 44 UNF 0,125 3,175 2,70 44 0,577
6 - 40 UNF 0,138 3,505 2,95 40 0,635
8 - 36 UNF 0,164 4,166 3,50 36 0,705
10 - 32 UNF 0,190 4,826 4,10 32 0,794
12 - 28 UNF 0,216 5,486 4,70 28 0,907
1/4" - 28 UNF 0,250 6,350 5,50 28 0,907
5/16" - 24 UNF 0,313 7,938 6,90 24 1,058
3/8" - 24 UNF 0,375 9,525 8,50 24 1,058
7/16" - 20 UNF 0,438 11,112 9,90 20 1,270
1/2" - 20 UNF 0,500 12,700 11,50 20 1,270
9/16" - 18 UNF 0,563 14,288 12,90 18 1,411
5/8" - 18 UNF 0,625 15,875 14,50 18 1,411
3/4" - 16 UNF 0,750 19,050 17,50 16 1,587
7/8" - 14 UNF 0,875 22,225 20,40 14 1,814
1" - 12 UNF 1,000 25,400 23,25 12 2,117
1 1/8" - 12 UNF 1,125 28,575 26,50 12 2,117
1 1/4" - 12 UNF 1,250 31,750 29,50 12 2,117
1 3/8" - 12 UNF 1,375 43,925 32,75 12 2,117
1 1/2" - 12 UNF 1,500 38,100 36,00 12 2,117
UNF Thread

 

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Gage Crib Worldwide, Inc.
6701 Old 28th St SE, Suite B
Grand Rapids, MI 49546-6937
Phone: 001-616-954-6581 • Fax: 001-616-954-6583
Email: gageguy@gagecrib.com

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