Brass Nylon Insert Lock Nut
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Brass Nylon Insert Lock Nut

Brass nylon insert lock nuts are hex nuts that have a nylon collar insert in one end of the nut. The nylon insert increases friction on the screw thread, which resists loosening. Dimensional specifications are governed by ASME B18.16.6. The nylon insert lock nut is an economic locking nut and ideal in applications where vibration or motion could loosen or undo the nut.

Governing StandardsBrass

ASME B18.16.6 Covers the complete general, dimensional, mechanical, and performance requirements (proof load, prevailing torque, and torque-tension) for carbon steel, inch series nylon insert locknuts of grades N2, N5, and N8 in styles NE (1/4 in. – 1-1/2 in.), NTE (1/4 in. – 1-1/2 in.), NU (1/4 in. – 3 in.), NTU (1/4 in. – 3 in.), NM (#2-#12), NTM (#2-#12), and hex flange (1/4 in. – 3/4 in.). This Standard also includes all-metal hex (#4-1-1/2 in.) and hex flange (1/4 in. – 3/4 in.) locking nuts of grades A, B, C, F, and G. These nut designs are designated as American National Standards.
ASME B1.1 UNC & UNF Class 2B Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Brass Head Marking
Brass Nylon Insert Lock Nut requires no material marking

Dimensional SpecificationsBrass

Nylon insert locknut dimensions
Per ASME B18.16.6-2017
Nominal Diameter UNC UNF A B C D
Width Across Flats Width Across
Corners
Thickness Hex Height
Basic Max Min Min Max Min Min
#2 0.086 56   1/4 0.251 0.243 0.268 0.153 0.133 0.081
#3 0.099 48   1/4 0.251 0.243 0.268 0.153 0.133 0.081
#4 0.112 40   1/4 0.251 0.243 0.268 0.153 0.133 0.081
#5 0.125 40   1/4 0.251 0.243 0.268 0.153 0.133 0.081
#6 0.138 32 40 5/16 0.313 0.305 0.339 0.188 0.168 0.103
#8 0.164 32 36 11/32 0.345 0.336 0.374 0.239 0.219 0.140
#10 0.190 24 32 3/8 0.376 0.243 0.410 0.249 0.229 0.140
#12 0.216 24 28 1/4 0.439 0.430 0.482 0.328 0.298 0.225
1/4 0.250 20 28 7/16 0.439 0.430 0.482 0.328 0.298 0.225
5/16 0.313 18 24 1/2 0.502 0.492 0.552 0.359 0.329 0.250
3/8 0.375 16 24 9/16 0.564 0.553 0.622 0.468 0.438 0.335
7/16 0.438 14 20 5/8 0.627 0.616 0.698 0.468 0.438 0.324
1/2 0.500 13 20 3/4 0.752 0.741 0.837 0.609 0.579 0.464
9/16 0.563 12 18 7/8 0.877 0.865 0.978 0.656 0.626 0.469
5/8 0.625 11 18 15/16 0.940 0.928 1.051 0.765 0.735 0.593
3/4 0.750 10 16 1 1/8 1.064 1.052 1.191 0.890 0.861 0.742
7/8 0.875 9 14 1 5/16 1.252 1.239 1.403 0.999 0.969 0.790
1 1.000 8 14 1 1/2 1.440 1.427 1.615 1.078 1.016 0.825
1 1/8 1.125 7 12 1 11/16 1.627 1.614 1.826 1.203 1.410 0.930
1 1/4 1.250 7 12 1 7/8 1.815 1.801 2.038 1.422 1.360 1.125
1 1/2 1.500 6 12 2 1/4 2.197 2.159 2.444 1.640 1.578 1.313
  1. All dimensions are in inches.
Brass Nylon Insert Lock Nut
View
Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
#6 32 5/16 0.1680 NFBR632N 3-5 Working Days $0.2452/EA EA
#8 32 11/32 0.2190 NFBR832N 3-5 Working Days $0.2452/EA EA
#10 24 3/8 0.2290 NFBR102N 3-5 Working Days $0.2076/EA EA
#10 32 3/8 0.2290 NFBR103N 3-5 Working Days $0.2452/EA EA
1/4 20 7/16 0.2980 NFBR025N In Stock $0.35349/EA EA
5/16 18 1/2 0.3290 NFBR031N In Stock $0.58343/EA EA
3/8 16 9/16 0.4380 NFBR037N In Stock $0.58343/EA EA
7/16 14 5/8 0.4380 NFBR043N 3-5 Working Days $1.85406/EA EA
1/2 13 3/4 0.5790 NFBR050N In Stock $1.58674/EA EA
1/2 20 3/4 0.5790 NFBR050NNF In Stock $2.49834/EA EA
5/8 11 15/16 0.7350 NFBR062N 3-5 Working Days $8.73886/EA EA
3/4 10 1 1/8 0.8610 NFBR075N 3-5 Working Days $10.31614/EA EA
3/4 16 1 1/8 0.8610 NFBR075NNF In Stock $11.14809/EA EA
7/8 9 1 5/16 0.9690 NFBR087N In Stock $16.79537/EA EA