Grade C Nylon Insert Lock Nut, Plated
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Grade C Nylon Insert Lock Nut, Plated

Grade C 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. Available in zinc plated finish. Zinc plating sacrifices itself, corroding before the base material, offering added corrosion resistance.

Governing StandardsGrade C

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.

Grade C Marking
Grade C Material Marking

Dimensional SpecificationsGrade C

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.
Grade C Nylon Insert Lock Nut, Plated
View
Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
1/4 20 7/16 0.2980 NNIP025G8 In Stock $0.0622/EA EA
1/4 28 7/16 0.2980 NNIP025G8F In Stock $0.12558/EA EA
5/16 18 1/2 0.3290 NNIP031G8 In Stock $0.07344/EA EA
5/16 24 1/2 0.3290 NNIP031G8F In Stock $0.17421/EA EA
3/8 16 9/16 0.4380 NNIP037G8 In Stock $0.12106/EA EA
3/8 24 9/16 0.4380 NNIP037G8F In Stock $0.23542/EA EA
7/16 14 5/8 0.4380 NNIP043G8 In Stock $0.11117/EA EA
7/16 20 5/8 0.4380 NNIP043G8F In Stock $0.37773/EA EA
1/2 13 3/4 0.5790 NNIP050G8 In Stock $0.27654/EA EA
1/2 20 3/4 0.5790 NNIP050G8F In Stock $0.25914/EA EA
9/16 12 7/8 0.6260 NNIP056G8 In Stock $0.7515/EA EA
9/16 18 7/8 0.6260 NNIP056G8F In Stock $0.58283/EA EA
5/8 11 15/16 0.7350 NNIP062G8 In Stock $0.58994/EA EA
5/8 18 15/16 0.7350 NNIP062G8F In Stock $0.49006/EA EA
3/4 10 1 1/8 0.8610 NNIP075G8 In Stock $0.86143/EA EA
3/4 16 1 1/8 0.8610 NNIP075G8F In Stock $0.74512/EA EA
7/8 9 1 5/16 0.9690 NNIP087G8 In Stock $1.62883/EA EA
7/8 14 1 5/16 0.9690 NNIP087G8F In Stock $1.86745/EA EA
1 8 1 1/2 1.0160 NNIP100G8 In Stock $2.36829/EA EA
1 14 1 1/2 1.0160 NNIP100G8F In Stock $2.7177/EA EA
1 1/8 7 11/16 1.41 NNIP112G8 In Stock $4.6953/EA EA
1 1/8 12 11/16 1.41 NNIP112G8F 3-5 Working Days $18.7836/EA EA
1 1/4 7 1 7/8 1.36 NNIP125G8 In Stock $6.35225/EA EA
1 1/4 12 1 7/8 1.36 NNIP125G8F In Stock $12.41751/EA EA