Serrated Hex Flange Lock Nuts

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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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Grade GT Flange Style Lock Nuts Dimensions | Class 2B Internal Thread Dimensions



Smith Fastener Company • 8181 State Street, South Gate, California 90280
Phone: ( 323 ) 587-0382 • FAX: ( 323 ) 587-8712 • E-mail: sales@smithfast.com
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