While the majority of bolt-type fasteners used in the United States conform to one or the other measurement scale, the difference between SAE and metric fasteners (and their corresponding sockets) is as profound as the difference between yards and meters: They are almost the same, but not quite.
How do you tell the difference between metric and SAE?
Metric and SAE fasteners are measured differently and with different vocabulary. SAE nuts, bolts and screws are measured by their thread count, or TPI (threads per inch) and their length. Metric fasteners are measured by length and pitch, or the distance between threads.
Is a 10mm socket metric or standard?
So what is a 10mm socket equivalent? The equivalent imperial size of a 10mm socket is a 3/8 socket. Imperial sizes are known as SAE (Society of Automotive Engineers) or Standard. Metric sizes, also known as SI (Système International), from the French International System.
Are 19mm and 3/4 the same?
19mm = 3/4 inch. 20mm = 25/32 inch. 21mm = just over 13/16 inch.
How can you tell if a bolt is metric or imperial?
If the bolt has lines on the head its standard or imperial. If the bolt has numbers on the head then its metric. These markings indicate how strong the bolt is they call this tensile strength. With an imperial bolt the more lines you have the higher the tensile the stronger the bolt.
What are metric sockets used for?
Metric sockets: Ideal for working on imported vehicles, metric sockets’ sizes are measured in millimeters. Typically, the most commonly used types are 10mm sockets and 36mm sockets. Torx bit sockets: Fitted with bits designed for Torx screws, Torx bit sockets use the same size measurements as SAE sockets.
How do I know if my threads are metric or imperial?
Metric threads are measured by their pitch. That is the distance from the crest of one thread to the crest of the next measured in millimetres. The pitch of a metric thread can be checked by direct measurement with a metric rule. Imperial threads have their pitch measured indirectly as a given number of teeth per inch.
What socket is between 9mm and 10mm?
Wrench Size And Conversion Table
| Inches | Millimeters | Spanner |
|---|---|---|
| 0.344 | 11/32 AF; 1/8 Wworth | |
| 0.354 | 9mm | 9mm |
| 0.375 | 3/8 AF | |
| 0.394 | 10mm | 10mm |
What is 8mm in standard?
Metric / Standard Wrench Conversion Chart
| Bolt Diameter | Metric | Standard |
|---|---|---|
| 1/8″ | 8mm | 5/16″ |
| 3/16″ | 10mm | 3/8″ |
| 1/4″ | 11mm | 7/16″ |
| 5/16″ | 13mm | 1/2″ |
What is the difference between SAE and Imperial sockets?
The SAE (Society of Automotive Engineers) system uses inches, and the imperial or metric system uses millimeters. At the hardware store, you may find yourself asking: “Why doesn’t this socket fit this nut?
Why are socket sizes based on metric?
Though there are various reasons for this, it tends to be more accurate than using fractional increments on an inch. This system is based on millimeters, so metric socket sizes are generally sizing like 8mm, 10mm, 12mm, and so on.
What is the difference between metmetric and SAE sockets?
Metric sockets use the metric measurement system i.e., millimeters to describe their size (e.g., an 18mm socket). SAE, or standard size, use the imperial measurement system we invented in the USA.
What is the difference between the metric system and imperial system?
While the main difference between the metric system and the imperial system is the type of units used, there are a few other key differences. The metric system is based around the unit of measurement called the meter. The meter was created using the earth’s circumference as it runs from the North Pole, through Paris, France and to the equator.
