Multiply the first number which is the bolt size in inches or millimeters, by 1.5 using a pocket calculator, if necessary. For example, for the numbers in Step 1, 1/2 x 1.5 = . 75 or 3/4, which is the wrench size needed for this standard-sized bolt.
How do you figure out what size bolts I need?
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.
What size bolt does a 1/2 inch wrench fit?
US Bolt Head/Wrench Size
| Bolt Diameter | Head and Wrench Size | |
|---|---|---|
| Hex Bolt – Lag Bolt – Square Bolt | Heavy Hex Bolt | |
| 1/4″ | 7/16″ or 3/8″ | – |
| 5/16″ | 1/2″ | – |
| 3/8″ | 9/16″ | – |
How do I know what size nut to buy?
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 are standard bolt sizes?
US Standard Thread Length for Bolts
| Bolt Diameter | Standard Thread Length (in.) * | |
|---|---|---|
| Bolts 6 inches and shorter | Bolts longer than 6 inches | |
| 5/8″ | 1-1/2″ | 1-3/4″ |
| 3/4″ | 1-3/4″ | 2″ |
| 7/8″ | 2″ | 2-1/4″ |
What size wrench fits a 1/2 bolt?
US Bolt Head/Wrench Size
| Bolt Diameter | Head and Wrench Size | |
|---|---|---|
| Hex Bolt – Lag Bolt – Square Bolt | Heavy Hex Bolt | |
| 1/2″ | 3/4″ | 7/8″ |
| 9/16″ | 13/16″ | – |
| 5/8″ | 15/16″ | 1-1/16″ |
What size bolt has a 1 1 2 head?
US Bolt Head/Wrench Size
| Bolt Diameter | Head and Wrench Size | |
|---|---|---|
| Hex Bolt – Lag Bolt – Square Bolt | Heavy Hex Bolt | |
| 1″ | 1-1/2″ | 1-5/8″ |
| 1-1/8″ | 1-11/16″ | 1-3/4″ |
| 1-1/4″ | 1-7/8″ | 2″ |
What size bolt has a 1/2 inch head?
Hex Bolt Head Size Chart
| Diameter | Head Size |
|---|---|
| 5/16″ | 1/2″ |
| 3/8″ | 9/16″ |
| 7/16″ | 5/8″ |
| 1/2″ | 3/4″ |
How much torque does a 1/2 inch bolt have?
US Recommended Bolt Torque
| Size | Recommended Torque | |
|---|---|---|
| Grade 2 | 18-8 S/S | |
| 1/2″ | 37 | 45 |
| 9/16″ | 53 | 63 |
| 5/8″ | 73 | 104 |
What is the diameter of a bolt?
Diameter of a bolt square, lag or hex bolt: Head and wrench Head and wrench size: Heavy hex bolt 5/16″ 1/2″ – 3/8″ 9/16″ – 7/16″ 5/8″ – 1/2″ 3/4″ 7/8″
What is the size of a US bolt head wrench?
US Bolt Head/Wrench Size Bolt Diameter Head and Wrench Size Head and Wrench Size 5/8″ 15/16″ 1-1/16″ 3/4″ 1-1/8″ 1-1/4″ 7/8″ 1-5/16″ 1-7/16″ 1″ 1-1/2″ 1-5/8″
What is the size of a hex bolt?
Bolt Chart With Wrench Size Diameter of a bolt square, lag or hex bolt: Head and wrench Head and wrench size: Heavy hex bolt 3/8″ 9/16″ – 7/16″ 5/8″ – 1/2″ 3/4″ 7/8″ 9/16″ 13/16″ –
What are the different types of bolts?
We will explain and define all the values such as diameter of a bolt, head and wrench size. Head and wrench sizes are divided on hex bolts, lag bolts and square bolts. We will also have a column with heavy hex bolts. All the values are presented in inches, keep that in mind.
