SS Serrated Flange Locking Nut
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SS Serrated Flange Locking Nut

18-8 stainless steel 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 B18.6.4.

Governing Standards18-8 Stainless Steel

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.

Dimensional SpecificationsCase Hardened

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.
SS Serrated Flange Locking Nut
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Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
1/4 20 7/16 0.2222 NFLS0250000 In Stock $0.10465/EA EA
5/16 18 1/2 0.2680 NFLS0310000 In Stock $0.23024/EA EA
3/8 16 9/16 0.33 NFLS0370000 3-5 Working Days $0.17573/EA EA
3/8 24 9/16 0.33 NFLS037NF00 In Stock $0.5914/EA EA
1/2 13 3/4 0.4380 NFLS0500000 3-5 Working Days $1.51269/EA EA