Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

US Bolts - Tightening Torques

Recommended bolt torques.

Sponsored Links

The tightening torques below are for imperial US bolts with tension approximately 70% of yield strength.

Size
(in)
Torque (lbf ft)
SAE Grade 2SAE Grade 5SAE Grade 818-8 S/S
CoarseFineCoarseFineCoarseFineCoarseFine
1/4 4 4.7 6.3 7.3 9 10 6.3 7.8
5/16 8 9 13 14 18 20 11 11.8
3/8 15 17 23 26 33 37 20 22
7/16 24 27 37 41 52 58 31 33
1/2 37 41 57 64 80 90 43 45
9/16 53 59 82 91 115 129 57 63
5/8 73 83 112 128 159 180 93 104
3/4 115 138 200 223 282 315 128 124
7/8 129 144 322 355 454 501 194 193
1 188 210 483 541 682 764 287 289
  • 1 inch = 25.4 mm

The values are for slightly lubricated bolts. For dry bolts increase the torques with approximately 30%.

US bolts - tightening torques

Sponsored Links

Related Topics

Related Documents

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • Engineering ToolBox, (2018). US Bolts - Tightening Torques. [online] Available at: https://www.engineeringtoolbox.com/us-bolts-torques-d_2055.html [Accessed Day Mo. Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

3 30

Sponsored Links
.