SS Nylon Insert Lock Nut
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SS Nylon Insert Lock Nut

18-8 stainless steel 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 Standards18-8 Stainless Steel

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.

18-8 Stainless Steel Head Marking
18-8 Stainless Steel requires no material marking

Dimensional Specifications18-8 Stainless Steel

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.
SS Nylon Insert Lock Nut
View
Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
#4 40 1/4 0.1330 NNIS 40000 In Stock $0.04087/EA EA
#6 32 5/16 0.1680 NNIS 60000 In Stock $0.07156/EA EA
#8 32 11/32 0.2190 NNIS 80000 In Stock $0.06334/EA EA
#10 24 3/8 0.2290 NNIS1020000 In Stock $0.05423/EA EA
#10 32 3/8 0.2290 NNIS1030000 In Stock $0.06657/EA EA
#12 24 1/4 0.2980 NNIS1220000 In Stock $0.22158/EA EA
1/4 20 7/16 0.2980 NNIS0250000 In Stock $0.08202/EA EA
1/4 28 7/16 0.2980 NNIS025NF00 In Stock $0.1282/EA EA
5/16 18 1/2 0.3290 NNIS0310000 In Stock $0.11017/EA EA
5/16 24 1/2 0.3290 NNIS031NF00 In Stock $0.16019/EA EA
3/8 16 9/16 0.4380 NNIS0370000 In Stock $0.17697/EA EA
3/8 24 9/16 0.4380 NNIS037NF00 In Stock $0.35714/EA EA
7/16 14 5/8 0.4380 NNIS0430000 In Stock $0.30051/EA EA
7/16 20 5/8 0.4380 NNIS043NF00 In Stock $0.30321/EA EA
1/2 13 3/4 0.5790 NNIS0500000 In Stock $0.37006/EA EA
1/2 20 3/4 0.5790 NNIS050NF00 In Stock $1.04291/EA EA
9/16 12 7/8 0.6260 NNIS0560000 In Stock $3.07623/EA EA
9/16 18 7/8 0.6260 NNIS056NF00 3-5 Working Days $1.76305/EA EA
5/8 11 15/16 0.7350 NNIS0620000 In Stock $1.12834/EA EA
5/8 18 15/16 0.7350 NNIS062NF00 In Stock $1.93568/EA EA
3/4 10 1 1/8 0.8610 NNIS0750000 In Stock $1.40356/EA EA
3/4 16 1 1/8 0.8610 NNIS075NF00 In Stock $2.99501/EA EA
7/8 9 1 5/16 0.9690 NNIS0870000 In Stock $6.70841/EA EA
7/8 14 1 5/16 0.9690 NNIS087NF00 In Stock $10.42685/EA EA
1 8 1 1/2 1.0160 NNIS1000000 In Stock $6.65986/EA EA
1 14 1 1/2 1.0160 NNIS100NF00 3-5 Working Days $15.49138/EA EA