SS Nylon Insert Jam Lock Nut
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SS Nylon Insert Jam Lock Nut

18-8 stainless steel nylon insert jam lock nuts are thin patterned 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 jam 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 Marking
18-8 Stainless Steel requires no material marking

Dimensional Specifications18-8 Stainless Steel

Nylon insert jam 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 0.0860 56   1/4 0.2510 0.2430 0.2680 0.1240 0.0940 0.0750
#4 0.1120 40   1/4 0.2510 0.2430 0.2680 0.1240 0.0940 0.0750
#6 0.1380 32 40 5/16 0.3130 0.3050 0.3390 0.1400 0.1100 0.0900
#8 0.1640 32 36 11/32 0.3450 0.3360 0.3740 0.1870 0.1570 0.1100
#10 0.1900 24 32 3/8 0.3760 0.3670 0.4100 0.1870 0.1570 0.1100
#12 0.2160 24 28 3/8 0.4390 0.4300 0.4820 0.2180 0.1880 0.1250
1/4 0.2500 20 28 7/16 0.4390 0.4300 0.4820 0.2180 0.1880 0.1250
5/16 0.3125 18 24 1/2 0.5020 0.4920 0.5520 0.2650 0.2350 0.1580
3/8 0.3750 16 24 9/16 0.5640 0.5530 0.6220 0.2810 0.2510 0.1500
7/16 0.4375 14 20 5/8 0.6270 0.6150 0.6940 0.3280 0.2980 0.2250
1/2 0.5000 13 20 3/4 0.7520 0.7410 0.8370 0.3280 0.2980 0.1900
9/16 0.5625 12 18 7/8 0.8770 0.8650 0.9780 0.3740 0.3440 0.2250
5/8 0.6250 11 18 15/16 0.9400 0.9280 1.0510 0.4060 0.3760 0.2650
3/4 0.7500 10 16 1 1/8 1.0640 1.0520 1.1910 0.4210 0.3910 0.2880
7/8 0.8750 9 14 1 1/4 1.2520 1.2390 1.4030 0.4840 0.4540 0.3400
1 1.0000 8 14 1 1/2 1.4400 1.4270 1.6150 0.5780 0.5160 0.4050
  1. All dimensions are in inches.
SS Nylon Insert Jam Lock Nut
View
Diameter Thread Pitch Width Across Flats Height of Nut Item # Availability Price Quantity UOM
1/4 20 7/16 0.1880 NNIS025NCJM In Stock $0.08173/EA EA
1/4 28 7/16 0.1880 NNIS025NFJM In Stock $0.12346/EA EA
5/16 18 1/2 0.2350 NNIS031NCJM In Stock $0.17135/EA EA
5/16 24 1/2 0.2350 NNIS031NFJM 3-5 Working Days $0.45922/EA EA
3/8 16 9/16 0.2510 NNIS037NCJM In Stock $0.25126/EA EA
3/8 24 9/16 0.2510 NNIS037NFJM In Stock $0.41618/EA EA
1/2 13 3/4 0.2980 NNIS050NCJM 3-5 Working Days $0.6347/EA EA
1/2 20 3/4 0.2980 NNIS050NFJM 3-5 Working Days $0.6347/EA EA
5/8 11 15/16 0.3760 NNIS062NCJM In Stock $2.7416/EA EA
5/8 18 15/16 0.3760 NNIS062NFJM 3-5 Working Days $10.21247/EA EA
3/4 10 1 1/8 0.3910 NNIS075NCJM In Stock $7.58735/EA EA
3/4 16 1 1/8 0.3910 NNIS075NFJM 3-5 Working Days $10.82862/EA EA
7/8 9 1 1/4 0.4540 NNIS087NCJM In Stock $15.48713/EA EA