Diyvehiclerepair
US Bolt Head/Wrench Size
| Bolt Diameter | Head and Wrench Size | |
|---|---|---|
| Hex Bolt - Lag Bolt - Square Bolt | Heavy Hex Bolt | |
| 3/4" | 1-1/8" | 1-1/4" |
| 7/8" | 1-5/16" | 1-7/16" |
| 1" | 1-1/2" | 1-5/8" |
- How do I know what size nut I need for a bolt?
- How do I know what size nut I need?
- What is a M14 bolt?
How do I know what size nut I need for a bolt?
To measure the diameter of screws and bolts, you measure the distance from the outer thread on one side to the outer thread on the other side. This is called the major diameter and will usually be the proper size of the bolt.
How do I know what size nut I need?
If the nut is metric, count the number of lines on the tape measure to find the measurement. If you count 9 lines, the size is a 9-mm (millimeter) nut. If the nut is US standard, count the smallest lines on the tape measure in sixteenths. Add the sixteenths together to find the size.
What is a M14 bolt?
The threads of an M14-2.0 screw, which is coarse, are spaced 0.079 inches (2.0 mm). A 9/16-12 screw, which is comparable in diameter and is also coarse, has its threads spaced 0.083 inches, which are farther apart, so there will be fewer threads per unit of measure (we used an inch in the table above).
