- Install the Security Locknuts on externally threaded part with class 2A (inch) or class 6H (metric) threads.
2. Make sure that the bolt or stud has a proper (35º to 45º) chamfer on the threaded end and that the end is flat. The diameter of the flat should be approximately 1/32” below the root diameter of the thread on the bolt or stud.
3. Install the by threading the externally threaded part (bolt, stud, or screw) into the main nut body side of the Security Locknut first. Do not thread the externally threaded part directly into the center lock ring.
4. Use of a power wrenching is NOT recommended until the lead thread of the lock ring is engaged by hand turning. Only after the initial hand- installation should the nut be fully installed by hand or power wrench to the “pull down” position.
5. In order to assure proper engagement, it is desirable, but not absolutely necessary, to have at least 2 threads extended beyond the top of the insert. The goal is to have the chamfer of the mating shaft extend beyond the top of the insert for proper engagement – see illustration below
6. Make sure all parts and threads are clean and undamaged, thereby insuring the best assembly.
7. In order to assure even greater joint integrity, lubrication such as anti-seize can be used on all bolts and shafts to reduce frictional interference. Lubrication is especially important on diameters 1-1/2” (or M33) and larger. Installation torques should be adjusted accordingly. It is not necessary to use lubricant on products with ATD coated lock rings.