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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 Socket drive hole is determined by usage and torque demand. Common and standard socket drive sizes are as follows:1/4 inch (6.3 mm), 3/8 inch (9.5 mm), 1/2 inch (12.7 mm), 3/4 inch (19.0 mm) and 1 inch (25.4 mm).

 

1/4 inch (6.3 mm)

  • Best Uses: Small repair jobs, such as electronics, household appliances, and small engines.
  • Details: This size is ideal for small bolts and lighter torque applications. It's perfect for precision work and offers great maneuverability in tight spaces.

3/8 inch (9.5 mm)

  • Best Uses: General automotive repair and home maintenance, including engine work and body components.
  • Details: Known as the standard size, the 3/8-inch socket works well with mid-sized bolts. It’s a go-to for most household toolkits.

 

1/2 inch (12.7 mm)

  • Best Uses: Medium to large equipment repair, such as trucks, SUVs, and industrial equipment.
  • Details: The 1/2-inch socket handles higher torque

 

3/4 inch (19.0 mm)

  • Best Uses: Heavy machinery and industrial equipment, like construction equipment, large trucks, and agricultural machinery.
  • Details: This size is used in heavy-duty situations with larger, tougher bolts. It's a common choice for professional repair and industrial settings.

 

1 inch (25.4 mm)

  • Best Uses: industrial equipment and machinery assembly and maintenance, such as excavators, cranes, and oil rigs.
  • Details: The 1-inch socket is built for extra-large bolts and extremely high torque. It’s designed for heavy-load applications and is typically used in specialized, professional, and industrial contexts.



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

How to Convert Between SAE and Imperial Socket Sizes? 

There are two different methods for measuring the hex sizes of 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? They appear to be very close in size!”


If you lack a clear understanding of socket sizing, it’s easy to choose the wrong tool. Without a tool of the correct size, you won’t be able to properly fix or lock the nut. How can you tell which one is the right size?


Many customers admit that they don’t know exactly how to convert between SAE (inches) and imperial or metric (millimeters) measurements. For example, what is the actual size difference between a 11/16" hex nut and a 17mm hex nut? Will both sizes fit a 17mm socket?

The conversion chart below shows the correlation between SAE (inches) and imperial (mm) measurements.

TienI_6PT_Metric&Inch_System


Tien-i: a hand tools Manufacturing Supplier has more than a decade of experience designing and manufacturing hand tools, impact sockets and OEM items to fulfill its customers’ specific demands. If you have any special design requirements, please get in touch with our sales team today.

 

The table below shows conversion from millimeters to inches and vice versa.
(Please note that these are approximate values, intended for making rough calculations)

Metric and SAE by Tien-i

 (Click above pic to download PDF)

 inchtometricbytien-i

 

(Click above pic to download PDF)


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.

For more information, please click below: 


Contact Tien-i

hand socket impact socket 6-Point Sockets 12-Point Sockets high quality tool maker made in Taiwan
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Ｑ＆Ａ

What kind of factory is Tien-i?

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.

to know more about hand socket and impact socket

How to get the Tien-I catalog?

Please download through the website. 

 

Go to our download page

How to inquiry the products which does not in the Tien-I’s catalog?

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

https://tien-i.com/contact

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

How to get the sample? What is the sample cost?

https://tien-i.com/contact   Please contact our sales team. 

Please contact our sales team.
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A look inside the Great Tool Catalog [PDF Free Download]
Hand Tools Knowledge and Resource
Prod x Stock x MOQ
2018/01/07
Prod x Stock x MOQ
Hand Tools Knowledge and Resource
Star Wars Tools: May the Force of Hand Tools Be With You
2017/12/11
Star Wars Tools: May the Force of Hand Tools Be With You
Hand Tools Knowledge and Resource
Stainless Steel Socket Set and Tools, what for?
2017/04/03
Stainless Steel Socket Set and Tools, what for?
Hand Tools Knowledge and Resource
Tools Kit and Custom Tools Case Assortment
2017/02/01
Tools Kit and Custom Tools Case Assortment
Hand Tools Knowledge and Resource
Custom Hand Tools and Custom Socket Set Cost Saving
2016/10/21
Custom Hand Tools and Custom Socket Set Cost Saving
Hand Tools Knowledge and Resource
Tien-I Socket Sets honor by Japan Reporter
2016/10/03
Tien-I Socket Sets honor by Japan Reporter
Hand Tools Knowledge and Resource
Tien-I Impact Sockets' secret, what's different inside?
2016/09/25
Tien-I Impact Sockets' secret, what's different inside?
Hand Tools Knowledge and Resource
Differences between DIN and ANSI Specifications for Impact Sockets
2016/08/01
Differences between DIN and ANSI Specifications for Impact Sockets
Hand Tools Knowledge and Resource
Socket Size Inch & Metric, Download Quick Convert Sheet Between SAE and Imperial Socket Sizes
2016/02/19
Socket Size Inch & Metric, Download Quick Convert Sheet Between SAE and Imperial Socket Sizes
Hand Tools Knowledge and Resource
Tien-i won Taiwan Excellence Award 2016
2016/01/04
Tien-i won Taiwan Excellence Award 2016
Hand Tools Knowledge and Resource
Seamless Steel Tube Processing Parts
2015/12/19
Seamless Steel Tube Processing Parts
Hand Tools Knowledge and Resource
All-in-one Design concept – Multifunctional Tools
2015/11/24
All-in-one Design concept – Multifunctional Tools
Hand Tools Knowledge and Resource
Vinci's Wrench - art hand tool
2015/10/30
Vinci's Wrench - art hand tool
Hand Tools Knowledge and Resource
Six-Point Sockets vs. Twelve-Point Sockets
2015/10/25
Six-Point Sockets vs. Twelve-Point Sockets
Hand Tools Knowledge and Resource
How to Design Tool Kits and Socket Sets?
2015/07/29
How to Design Tool Kits and Socket Sets?
Hand Tools Knowledge and Resource
How to Select the Right Spark Socket
2015/07/17
How to Select the Right Spark Socket
Hand Tools Knowledge and Resource
Tien-I Super Automatic Center Punch
2015/07/02
Tien-I Super Automatic Center Punch
Hand Tools Knowledge and Resource
Guess how many hand tools for Chevy Small-Block Rebuild?
2015/06/19
Guess how many hand tools for Chevy Small-Block Rebuild?
Hand Tools Knowledge and Resource
Human and Hand Tool Little History
2015/06/16
Human and Hand Tool Little History
Hand Tools Knowledge and Resource
CNC metal processing
2015/05/04
CNC metal processing
Hand Tools Knowledge and Resource
Where is my tool?! Here is Solution!
2015/04/30
Where is my tool?! Here is Solution!
Hand Tools Knowledge and Resource
Ratchet Handle Design (Standard + Round head)
2015/04/14
Ratchet Handle Design (Standard + Round head)
Hand Tools Knowledge and Resource
How to use basin tap box spanner?
2015/04/12
How to use basin tap box spanner?
Hand Tools Knowledge and Resource
Steel Standard Comparison, CNS, JIS, AISI, ASTM, DIN
2015/04/06
Steel Standard Comparison, CNS, JIS, AISI, ASTM, DIN
Hand Tools Knowledge and Resource
How to Use a Universal Joint Socket
2015/02/24
How to Use a Universal Joint Socket
Hand Tools Knowledge and Resource
Made In Taiwan Impact Socket and Socket Tools Kit
2015/02/04
Made In Taiwan Impact Socket and Socket Tools Kit
Hand Tools Knowledge and Resource
What the BIG Impact Socket Wrench for?
2014/12/31
What the BIG Impact Socket Wrench for?
Hand Tools Knowledge and Resource
Tien-i New item : Adjustable T-handle Driver and Bit - Turbo Speed Wrench
2014/12/26
Tien-i New item : Adjustable T-handle Driver and Bit - Turbo Speed Wrench
Hand Tools Knowledge and Resource
How to use Nylon Strap Wrench
2014/11/29
How to use Nylon Strap Wrench
Hand Tools Knowledge and Resource
Tien-I Chrome Socket VS. Impact Socket
2014/11/28
Tien-I Chrome Socket VS. Impact Socket
Hand Tools Knowledge and Resource
Why Is It Important To Know The Torque of Hand Tools?
2014/11/12
Why Is It Important To Know The Torque of Hand Tools?
Hand Tools Knowledge and Resource
Impact Socket Material, Chrome Molybdenum Steel, CR-MO
2014/10/15
Impact Socket Material, Chrome Molybdenum Steel, CR-MO
Hand Tools Knowledge and Resource
Tien-I Chooses Taiwanese Chrome Vanadium Steel for Durability and Resilience
2014/10/08
Tien-I Chooses Taiwanese Chrome Vanadium Steel for Durability and Resilience
Hand Tools Knowledge and Resource
Why Tien-I won't use "only" Carbon Steel
2014/10/01
Why Tien-I won't use "only" Carbon Steel
Hand Tools Knowledge and Resource
DIY tools is better choice for your market?
2014/09/15
DIY tools is better choice for your market?
Hand Tools Knowledge and Resource
The Accessories of Socket Set
2014/09/01
The Accessories of Socket Set
Hand Tools Knowledge and Resource
What Is A Socket Wrench?
2014/08/31
What Is A Socket Wrench?
Hand Tools Knowledge and Resource
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