ASME B18.16.6:2017 pdf free download.Prevailing Torque Locknuts (Inch Series).
5 NUT DESIGNS AND PROPERTY GRADES
5.1 Nylon Insert Locknuts
Nylon in.cert locknuts are two-piece construction hex nuts and hex flange nuts that derive their prevailing torque characteristics from a full ring of nylon material. kwated and retained in the nut under its top surface. The are designated in Table I as property grades N2, N5, and N8 with hardness requirements in Table 2. The configuration styles are NE (Table 3), NTE (Table 4), NU (Table 5), NTU (Table 6), NM (tihle 7), NTM (Table 8), and hex flange (Table 9).
5.2 All•Metal Locknuts
All-metal locknuts are one-piece construction lwx and hex flange nuts that derive their prevailing torque performance from controlled distortion of the nut threads and/or body. Hex locknut5 are designated as grades A. B. and C. The dimensions are located in Table 10, Hex flange locknuts are designated as grades F and G. The dimensions are in Table 11. Table I identifies the material requirements for the various grades, and Table 2 identifies sizes and hardness requirements for the various grades.
6 CORNER FILL
A rounding or lack of fill at the location where the hex comcls intersect with the chamfer shall be permissible, provided the width across corners is within specified limits in the area extending from a distance equal to 17.5’,. of the basic thread diameter from the chamfered bearing lace to 85° of the specified minimum hex height.
7 CHAMFERS AND BEARING CIRCLES
7.1 Chamler Length on Beailng Side ol Nuts
The length of chamfer at hex corners shall be from 5% to 15% of the nominal thread diameter. Ihe surtace of the chamfer may be convex or rounded.
7.2 BearIng Surface Diameter
The diameter of bearing circle on chamfered nuts and washer-faced nuts shall be within the limits of the maximum width acress flats and 95% of the minimum width aauss flats.
8 COUNTERSINKS
Unless otherw
9 THREADS
Threads shall be unified thread form coarse, line, or 8 thread series (UNC, UNF, or 8-UN) Class 213 in axordance with ASME 81.1 or UNJ thread form (UNJC, UNIF, or UNIN series) eithet Class 213 or 38 in accordance with ASME 81.15 provided all performance requirements of the final parts are in compliance.
Inspection shall be in accordance with System 21 of ASME 131.3. Inspection shall be conducted prior to nut deformation or nylon ring captkation.
ASME B18.16.6:2017 pdf free download
