×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Torque Values for Brass Fasteners

Torque Values for Brass Fasteners

Torque Values for Brass Fasteners

(OP)
Does anyone have a torque value table for brass fasteners? I am specifically looking for 5-16"-18 brass to mount a ground lug to the stud. I would like the preload and finish torque values.

RE: Torque Values for Brass Fasteners

For steel fasteners, the torque value is that which results in fastener tension of nominally 75% of the yield strength of the fastener material.  I'm not sure if this is recommended for brass (or other nonsteel fasteners.)

Phil

RE: Torque Values for Brass Fasteners

Identify the yield strength of the brass fasteners you're using, and multiply this by the Tensile Stress Area of the 5/16" fastener.  This is the axial force at bolt yield.  Determine your factor of safety against assembly yield (ex. 75%) and reduce the bolt force by this amount.  This is your assembly bolt load.  Torque = Assembly Bolt Load(lb) x nut factor x Nominal Bolt Diameter(in)= in=lb
The nut factor will vary from 0.10 - 0.4 depending upon many variables.  With new fasteners, anti-seize thread lube, and hardened flat washers (or smooth flange) the nut factor will be ~0.18.

RE: Torque Values for Brass Fasteners

(OP)
Thank you all for your replies.

RE: Torque Values for Brass Fasteners

Hi webber,

Here is a very simple method of determining the optimum torque. First, get a torque wrench, and install the brass bolts into a suitable temporary joint. Add the nut and torque slowly, adding force increments until the bolt thread is sheared, or the threads shear.

Now you know the torque required to achieve the ultimate shear strength of this specific bolt. For a safe working-margin, just use 60% to 70% of this value, when torquing your bolts in your actual application.

This method can be used with any bolt material. However, you still have to confirm that the bolts can handle the loading applied in service.

Good luck,

abdul

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources