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

US Bolts - Tightening Torques

Recommended bolt torques.

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

US Bolts - Tightening Torques
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

Related Topics

  • Fasteners

    Bolts, nuts and threaded rods - torque, tension and loads.

Related Documents

Search

Search is the most efficient way to navigate the Engineering ToolBox.

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 older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

Citation

This page can be cited as

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

Modify the access date according your visit.

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!

Unit Converter

















































9.26.9

.