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Finished Hex Nuts
Grades 5 and 8
Grade 5
Mechanical & Physical
Properties		 Grade 8
Mechanical & Physical
Properties


Finished Hex Nuts - ANSI/ASME B18.2.2
Nominal Size
or Basic Major
Thread Diameter		 F G H
Width
Across Flats		 Width
Across Corners		 Thickness
Basic Max Min Max Min Basic Max Min
1/4 .2500 7/16 .438 .428 .505 .488 7/32 .226 .212
5/16 .3125 1/2 .500 .489 .577 .557 17/64 .273 .258
3/8 .3750 9/16 .562 .551 .650 .628 21/64 .337 .320
7/16 .4375 11/16 .688 .675 .794 .768 3/8 .385 .365
1/2 .5000 3/4 .750 .736 .866 .840 7/16 .448 .427
9/16 .5625 7/8 .875 .861 1.010 .982 31/64 .496 .473
5/8 .6250 15/16 .938 .922 1.083 1.051 35/64 .559 .535
3/4 .7500 1-1/8 1.125 1.088 1.299 1.240 41/64 .665 .617
7/8 .8750 1-5/16 1.312 1.269 1.516 1.447 3/4 .776 .724
1 1.0000 1-1/2 1.500 1.450 1.732 1.653 55/64 .887 .831
1-1/8 1.1250 1-11/16 1.688 1.631 1.949 1.859 31/32 .999 .939
1-1/2 1.500 2-1/4 2.250 2.175 2.598 2.480 1-9/32 1.317 1.245


Grade 5 Nut Images
Grade 5 Nut Properties
Description A six sided internally threaded fastener made from steel.
Appication
& Advantaged		 For use with bolts of a minimum tensile strength equal to or less than the specified proof stress of the nut.
Material AISI 1008 - 1026 steel that comforms to the following:
Carbon: .55% maximum, Manganese: .30% minimum, Sulfur:.15% maximum
Core Hardness Rockwell C32 maximum
Proof Load 1/4 thru 1 inch: Course Thread: 120,000 psi Fine Thread: 109,000 psi
1-1/8 thru 1-1/2 inch: Course Thread: 105,000 psi Fine Thread: 94,000 psi
Plating See plating page for plating information.
Product standards require all grade-marked nuts 1/4 inch diameter and larger to have a raised or depressed insignia identifying its manufacturer. The X in the images above represent one such location.


Grade 8 Nut Images
Grade 8 Nut Properties
Description A six sided internally threaded fastener made from steel.
Appication
& Advantaged		 For use with bolts of a minimum tensile strength equal to or less than 150,000 psi.
Material AISI 1021 - 1045 or equivalent steel that comforms to the following:
Carbon: .55% maximum, Manganese: .30% minimum, Sulfur:.05% maximum
The purchaser and producer of the nuts may agree to allow a sulfur content of .33% maximum provided that the manganese content is at least 1.35%.
Core Hardness 1/4 thru 5/8 inch: Rockwell C24 - C32
3/4 thru 1 inch: Rockwell C26 - C34
Over 1 thru 1-1/2 inch: Rockwell C26 - C36
Proof Load 1/4 thru 1-1/2 inch: 150,000 psi
Plating See plating page for plating information.
Product standards require all grade-marked nuts 1/4 inch diameter and larger to have a raised or depressed insignia identifying its manufacturer. The X in the images above represent one such location.

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Smith Fastener Company, A California Corporation - 3613 East Florence Avenue, Bell, California, 90201 - Phone: ( 323 ) 587-0382 - FAX: ( 323 ) 587-8712 - E-mail: sales@smithfast.com - Copyright © 2000 by Smith Fastener Company - Last updated: May 22nd, 2006 - http://www.smithfast.com/finishedhexnuts5_8.html