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Serrated Hex Flange Lock Nuts

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Serrated Hex Flange Lock Nuts - IFI 1986
Nominal Size
or Basic Major
Thread Diameter		 F G B H K J
Width
Across Flats		 Width
Across Corners		 Flange Diameter Nut Thickness Wrenching
Length		 Flange
Thickness
Max Min Max Min Max Min Max Min Max Min
6 .1380 .312 .302 .361 .342 .422 .406 .171 .156 .10 .02
8 .1640 .344 .334 .397 .381 .469 .452 .203 .187 .13 .02
10 .1900 .375 .365 .433 .416 .500 .480 .219 .203 .13 .03
12 .2160 .438 .428 .505 .488 .594 .574 .236 .222 .14 .04
1/4 .2500 .438 .428 .505 .488 .594 .574 .236 .222 .14 .04
5/16 .3125 .500 .489 .577 .557 .680 .660 .283 .268 .17 .04
3/8 .3750 .562 .551 .650 .628 .750 .728 .347 .330 .23 .04
7/16 .4375 .688 .675 .794 .768 .937 .910 .395 .375 .26 .04
1/2 .5000 .750 .736 .866 .840 1.031 1.000 .458 .437 .31 .05
9/16 .5625 .875 .851 1.010 .982 1.188 1.155 .506 .483 .35 .05
5/8 .6250 .938 .922 1.083 1.051 1.281 1.248 .569 .545 .40 .05
3/4 .7500 1.125 1.088 1.299 1.240 1.500 1.460 .675 .627 .46 .06
7/8 .8750 1.179 1.166 1.361 1.295 1.682 - .786 .742 - .11
IFI specification apply to #6 thru 3/4 inch diameters only.


Serrated Hex Flange Lock Nut Properties
Description A flanged hex nut with serrations on the bearing surface. The serrations displace material on the mating surface when the nut is tightened, forming a connection that resists loosening.
Applications
& Advantages		 Requires a greater amount of torque to loosen the nut than tightening. They will span oversized or poorly aligned holes. The flange provides a more uniform bearing-stress to clamp-force ratio than other low carbon lock nuts. They do not gall screw threads.
Material Steel Stainless
Made from a carbon steel which conforms to the following chemical composition requirements: Phosphorus: .12% max Carbon: .47% max Sulfur: .23% max 18-8 stainless steel
Heat Treatment Case hardened to the proper surface hardness to ensure the serrations will have sufficient gripping strength. -
Surface Hardness Rockwell C40 maximum Rockwell B95 - C32
Plating Usually supplied with a zinc plating. Usually supplied without any additional plating.

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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/serratedhexflangenuts.html