Bolt Pattern Conversion Chart (mm to inches)
The bolt pattern (also known as the P.C.D. or Pitch Circle Diameter) of a vehicle can be referenced in either standard or metric, and usually the year and kind of vehicle dictates how the bolt pattern is referenced. Most older cars the bolt pattern is referenced in standard “Five on Four and a Half” (or 5×4.5), versus a model car that is referenced in metric “Five on One Fourteen Point Three” (or 5×114.3). Both are correct, but it can sometimes be confusing as we have heard folks say “No, my car isn’t 5×114.3 it’s 5×4.5!!”. Here’s a handy reference for those times:
BOLT PATTERN CONVERSION (mm to inches)
| COMMON REFERENCE | MILLIMETERS | CONVERTS TO | INCHES |
|---|---|---|---|
| Three on One Twelve | 3×112 | CONVERTS TO | 3×4.41 |
| COMMON REFERENCE | MILLIMETERS | CONVERTS TO | INCHES |
| Four on Ninety-Eight | 4×98 | CONVERTS TO | 4×3.9 |
| Four on One Hundred | 4×100 | CONVERTS TO | 4×3.94 |
| Four on Four | 4×101.6 | CONVERTS TO | 4×4 |
| Four on One “O” Eight — or — Four on Four and a Quarter |
4×108 | CONVERTS TO | 4×4.25 or 4×4 1/4 |
| Four on One Ten | 4×110 | CONVERTS TO | 4×4.33 |
| Four on One Fourteen Point Three — or — Four on Four and a Half |
4×114.3 | CONVERTS TO | 4×4.5 or 4×4 1/2 |
| COMMON REFERENCE | MILLIMETERS | CONVERTS TO | INCHES |
| Five on One Hundred | 5×100 | CONVERTS TO | 5×3.94 |
| Five on Four | 5×101.6 | CONVERTS TO | 5×4 |
| Five on One “O” Eight — or — Five on Four and a Quarter |
5×108 | CONVERTS TO | 5×4.25 or 5×4 1/4 |
| Five on One Ten | 5×110 | CONVERTS TO | 5×4.33 |
| Five on One Twelve | 5×112 | CONVERTS TO | 5×4.41 |
| Five on One Fourteen Point Three — or — Five on Four and a Half |
5×114.3 | CONVERTS TO | 5×4.5 or 5×4 1/2 |
| Five on One Fifteen | 5×115 | CONVERTS TO | 5×4.52 |
| Five on One Twenty | 5×120 | CONVERTS TO | 5×4.72 |
| Five on Four and Three Quarter | 5×120.7 | CONVERTS TO | 5×4.75 or 5×4 3/4 |
| Five on Five — or — Five on One Twenty-Seven |
5×127 | CONVERTS TO | 5×5 |
| Five on One Thirty | 5×130 | CONVERTS TO | 5×5.12 |
| Five on One Thirty Five | 5×135 | CONVERTS TO | 5×5.3 |
| Five on Five and a Half — or — Five on One Thirty-Nine |
5×139.7 | CONVERTS TO | 5×5.5 or 5×5 1/2 |
| Five on One Fifty | 5×150 | CONVERTS TO | 5×5.9 |
| COMMON REFERENCE | MILLIMETERS | CONVERTS TO | INCHES |
| Six on One Fourteen — or — Six on Four and a Half |
6×114.3 | CONVERTS TO | 6×4.5 or 6×4 1/2 |
| Six on One Twenty-Seven — or — Six on Five |
6×127 | CONVERTS TO | 6×5 |
| Six on One Thirty | 6×130 | CONVERTS TO | 6×5.1 |
| Six on One Thirty-Two | 6×132 | CONVERTS TO | 6×5.2 |
| Six on One Thirty Five | 6×135 | CONVERTS TO | 6×5.3 |
| Six on Five and a Half — or — Six on One Thirty-Nine |
6×139.7 | CONVERTS TO | 6×5.5 6×5 1/2 |
| COMMON REFERENCE | MILLIMETERS | CONVERTS TO | INCHES |
| Seven on One Fifty | 7×150 | CONVERTS TO | 7×5.9 |
| COMMON REFERENCE | MILLIMETERS | CONVERTS TO | INCHES |
| Eight on Six and a Half | 8×165.1 | CONVERTS TO | 8×6.5 or 8×6 1/2 |