For conditions noted, also check condition of wheel stud holes. CAUTION: Proper lug nut torque is essential. Follow manufacturer's torque specifications and tightening sequence. Monroe® recommends the use of a "click" type torque wrench or torque stick. DO NOT lubricate threads unless specified by the vehicle manufacturer.
| Condition | Code | Procedure |
|---|---|---|
| Bent | A | Require replacement |
| Broken | A | Require replacement |
| Some manufacturers require replacement of all studs on any wheel if two or more studs or nuts on the same wheel are broken or missing. | ||
| Loose | A | Require repair or replacement of affected component |
| Lug nut flats rounded | A | Require replacement of nut |
| Lug nut installed backward | B | Require repair |
| Lug nut mating surface dished | A | Require replacement of nut |
| Lug nut mating type incorrect | B | Require replacement of nut |
| Lug nut seized | A | Require replacement of nut and/or stud |
| Stud incorrect | B | Require replacement of stud |
| Threads damaged | A | Require repair or replacement of component with damaged threads |
| Threads stripped (threads missing) | A | Require replacement of component with stripped threads |
| A | Part no longer performs intended purpose |
| B | Part does not meet a design specification (regardless of performance) |
| C | Part is missing |
| 1 | Part is close to the end of its useful life (just above discard specifications, or weak; failure likely to occur soon, etc.) |
| 2 | To address a customer need, convenience, or request (to stiffen ride, enhance performance, eliminate noise, etc.) |
| 3 | To comply with maintenance recommended by the vehicle’s Original Equipment Manufacturer (OEM) |
| 4 | Technician’s recommendation based on substantial and informed experience |
