What is lug nut thread engagement?
Threaded engagement is how much contact your lug nuts make with the stud, or how many turns are completed before tightening. If a conventional lug nut does not allow for proper thread engagement, you may need an extended thread (ET) lug nut. When installing ET lug nuts, make sure the lug holes on the wheels are wide enough to accommodate the extended threaded area.For your safety, proper thread engagement requirements must be met.
In order to safely mount your wheels, it is important that the lug nuts are sized to fit your vehicle's requirements. If your lug nuts or lug bolts do not match the pitch of your vehicle, they will not work.
There are appear to be several “styles” of solid nuts so be sure to compare the shape of the old nut surface, that presses against the rim, with the surface shape of the replacement nuts.
Lug nut sizes are given in two numbers. The first number is the diameter of the stud. The second number is the pitch. On metric studs, the pitch is the distance between each thread (in millimeters). On a standard lug nut, the pitch is the number of threads per inch.
For example, a 12mmx1.5 lug nut has a diameter of 12mm and a pitch of 1.5mm.
Confirm the lug seat type and size of your wheel before purchasing, you can obtain information from the wheel manufacturer.