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2014/08/01
Hand Tools Knowledge and Resource

Socket Size Basic Knowledge

How to Measure Socket Drive Size

In the diagram above, the three key dimensions of a socket are labeled as Drive Hole, L, andS. These key dimensions determine the usage of this socket as follows:


Drive Hole
 
indicates the size of the drive hole (also referred to as the "driver hole" or "square hole"), which determines the torque size of the driver tool you’ll need. For example, you’d use a ½-inch drive socket with a ½-inch drive ratchet.


L
indicates the overall socket length. The length you’ll need will be determined by your working environment. For screws in deep holes, a deep socket will be your best option.


S
indicates the target size of the nut, which determines which socket you’ll need. For example, you’ll require a 5mm socket for a 5mm nut.


Drive Hole Size

The size of the drive hole is determined by usage and torque demand. Common measurements are as follows:
1/4”(6.3mm), 3/8”(9.5mm), 1/2”(12.7mm), 3/4”(19.0mm) and 1”(25.4mm)。


Why use inch? Because this was developed in Great Britain during the Industrial Age.

Socket Drive Hole

At the hardware store, you’ll find ratchet wrenches and other spanners with the above drive-hole sizes. The bigger the drive hole, the higher the torque resistance. Smaller drive holes are suitable for confined spaces. Generally speaking, 3/8 inch (9.5 mm) is the most popular size in the auto repair industry. However, it changes country by country. 

 

Socket Sizes:SAE (INCH, fraction) & Metric (mm)

In the current market, socket sizes are divided into two systems: SAE (imperial, measured in inches) and metric (measured in millimeters). Both 6-point and 12-point sockets are measured using these two systems. The popular range is 5.5~24mm. SAE is used primarily in the United States and metric is used primarily in Europe and Asia.

Convert: 1 inch = 25.4mm


Socket Length

Sockets are available in deep, semi-deep and standard sizes. You can select the length most suitable for your working environment. The semi-deep size is designed specifically for 3/8" DR.


 

Tien-i: a hand tools Manufacturing Supplier as the leading manufacturer ofbit sockets andimpact sockets, Tien-I provides the full range of sockets and customized metal processing parts.

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Q&A

What is the popular size of chrome sockets?

Tien-I is a manufacoturer at professional designing tool kit and producing OEM/ODM products. 

Is the bit head magnetic?

Please provide the sample or the photo for us reference to see which bits you ask for.

What is the popular size of impact sockets?

What kind of tool kit do you want? And what’s the sales territory? Different countries have different popular sizes. Welcome to send us an email for further discussion. .

What is the popular size of chrome sockets?

What kind of tool kit do you want? And what’s the sales territory? Different countries have different popular sizes. Welcome to send us an email for further discussion.

What is the difference between impact socket and chrome socket? Why is CR-V material not suitable at producing impact sockets?

Tien-i's hand sockets are made of Cr-V steel (CR-V).

Compared with the raw material "CR-V" for hand sockets, the raw material for pneumatic sockets, CR-MO, has stronger toughness, i.e. stronger shock resistance. Suitable for use with air and electric guns. CR-V steel (CR-V) has higher hardness, but in the need for shock-resistant use environment will lead to reduced service life.

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Please contact our sales team. It’s welcome to provide the relative drawing or sample and the product sales information.

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