LOW PROFILE NYLON INSERT LOCK NUT
The present invention relates to prevailing torque lock nuts and, more particularly, to a low profile lock nut that maintains the same strength as its higher profile counterparts. The present lock nut is a non-metallic lock having an inner recess so as to receive a plastic insert, such as a nylon insert. In some embodiments, the plastic insert is a temperature resistant plastic insert capable of withstanding high temperatures. Further, in some embodiments, the present lock nut is manufactured to have increased hardness levels and subject to enhanced plating process that ensure superior corrosion resistance.
1 . A low profile lock nut comprising:
a body having a plurality of faces that extend upward from a bottom end of the body and terminate at a neck that extends upward therefrom and terminates at a top end of the body;
a bore that extends through the body from the top end to the bottom end, the bore further comprising:
a threaded portion that extends upward from the bottom end and includes a plurality of threads and
an unthreaded portion that extends upward from the threaded portion and defines a recess that laterally extends into the body; and
an insert that is arranged in the recess and includes an insert bore that aligns with the threaded portion of the bore.
2 . The low profile lock nut of claim 1 , wherein the insert is a nylon insert.
3 . The low profile lock nut of claim 2 , wherein the nylon insert comprises a heat stabilized polyamide.
4 . The low profile lock nut of claim 1 , wherein the insert bore includes a plurality of insert threads.
5 . The low profile lock nut of claim 1 , wherein the insert is ring shaped.
6 . The low profile lock nut of claim 1 , wherein the lock nut has a hardness of about HRc 33-39.
7 . The low profile lock nut of claim 1 , wherein the lock nut conforms to ISO 898-2.
8 . The low profile lock nut of claim 1 , wherein the recess is an annular recess.
9 . The low profile lock nut of claim 1 , wherein the threads are ISO metric screw threads in the range of M6 to M18.
10 . The low profile lock nut of claim 1 , wherein the threaded portion and the unthreaded portion of the bore are concentric.
11 . The low profile lock nut of claim 10 , wherein the threaded portion of the bore and the insert bore are concentric.
12 . The low profile lock nut of claim 1 , wherein the plurality of faces are arranged in a hexagonal nut configuration.
13 . The low profile lock nut of claim 1 , further comprising a shoulder that interposes the neck and the plurality of faces.
14 . The low profile lock nut of claim 13 , wherein the unthreaded portion of the bore corresponds with at least a portion of the neck.
15 . The low profile lock nut of claim 13 , wherein the unthreaded portion of the bore corresponds with the neck and at least part of the shoulder.
16 . The low profile lock nut of claim 13 , wherein the unthreaded portion of the bore corresponds with the neck, the shoulder, and at least a portion of the plurality of faces.
17 . A method of manufacturing a low profile lock nut, the method comprising:
providing a lock nut having an upwardly extending body and a neck portion at an upper end of the body, the neck portion being open at an upper end thereof, the lock nut further comprising a bore that extends through the body, the bore having an unthreaded portion that corresponds with at least the neck portion and defines a recess that laterally extends into the body:
applying a coating to the lock nut;
inserting an insert through the upper end of the neck portion and into the recess;
coining the upper end of the neck portion to form a hooked lip; and
applying a top coat to the lock nut.
18 . The method of claim 17 , wherein the coating is an electroplating process.
19 . The method of claim 17 , wherein the lock nut is subject to an additional step following the step of applying a coating to the lock nut, the additional step comprising baking the lock nut.
20 . The method of claim 17 , wherein the top coat is a corrosion resistant coating.