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Serrated Flange Lock Nut, Plated

Selected Serrated Flange Lock Nut PlatedFlange Nuts
Serrated Flange Lock Nut PlatedFlange Nuts

Case hardened serrated flange lock nuts eliminate the need for a lock washer or washer, as the flange serves to distribute the bearing load over a greater area. The bearing surface has circular serrations that fan out so that once the serrated flange makes contact with the mating surface, the serrations cut into and displace the mating material upon tightening. All metal lock nuts are resistant to high temperatures and high chemical exposures, as they are made from one material. Dimensional specifications are governed by ASME B18.16.4. Available in zinc plated finish. Zinc plating sacrifices itself, corroding before the base material, offering added corrosion resistance.

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Dimensional Specifications

Serrated flange lock nut dimensions
Per ASME B18.16.4-2008
Nominal Diameter UNC UNF F G B H J K
Width Across Flats Width Across Corners Flange Diameter Nut Thickness Hex
Height		 Flange
Thickness
Max Min Max Min Max Min Max Min
#6 0.1380 32 40 0.3120 0.3020 0.3610 0.3420 0.4220 0.4060 0.1710 0.1560 0.1000 0.0200
#8 0.1640 32 36 0.3440 0.3340 0.3970 0.3810 0.4690 0.4520 0.2030 0.1870 0.1300 0.0200
#10 0.1900 24 32 0.3750 0.3650 0.4330 0.4160 0.5000 0.4800 0.2190 0.2030 0.1300 0.0300
#12 0.2160 24 28 0.4380 0.4280 0.5050 0.4880 0.5940 0.5740 0.2360 0.2220 0.1400 0.0400
1/4 0.2500 20 28 0.4380 0.4280 0.5050 0.4880 0.5940 0.5740 0.2360 0.2222 0.1400 0.0400
5/16 0.3125 18 24 0.5000 0.4890 0.5770 0.5570 0.6800 0.6600 0.2830 0.2680 0.1700 0.0400
3/8 0.3750 16 24 0.5620 0.5510 0.6500 0.6280 0.7500 0.7280 0.3470 0.3300 0.2300 0.0400
7/16 0.4375 14 20 0.6880 0.6750 0.7940 0.7680 0.9370 0.9100 0.3950 0.3750 0.2600 0.0400
1/2 0.5000 13 20 0.7500 0.7360 0.8660 0.8400 1.0310 1.0000 0.4580 0.4370 0.3100 0.0500
9/16 0.5625 12 18 0.8750 0.8610 1.0100 0.9820 1.1880 1.1550 0.5060 0.4830 0.3500 0.0500
5/8 0.6250 11 18 0.9380 0.9220 1.0830 1.0510 1.2810 1.2480 0.5690 0.5450 0.4000 0.0500
3/4 0.7500 10 16 1.1250 1.0880 1.2990 1.2400 1.5000 1.4600 0.6750 0.6270 0.4600 0.0600
7/8 0.8750 9 14 1.1790 1.1660 1.3610 1.2950 1.6820 * 0.7860 0.7420 * 0.1100
  1. All dimensions are in inches.

Governing Standards

ASME B18.16.4 Covers the general, dimensional, and mechanical performance requirements for low strength carbon steel, case hardened, regular and large serrated flange locknuts (inch series), recognized as American National Standard.
ASME B1.1 UNC & UNF Class 2B Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.