Contact US

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!

*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

Bolt Threads in a Shear Plane

Bolt Threads in a Shear Plane

Bolt Threads in a Shear Plane

Dear All,
In a Bolted Joint, the threads are not good in the shear plane of the joint.
In the tapped bolted joint, what is the best practice to start threads on bolt/member, are the threads start a little lower than the surface of the lower member of the joint which has internal threads.
Thanks for your input.

RE: Bolt Threads in a Shear Plane

I wouldn't say the having threads in the shear plane is "not good". Threads in the shear plane reduces the design shear capacity, but most of the bolted connections for the bridges we design have, or are assumed to have, threads in the shear plane. We just design for the lower shear capacity and move on, rather than sweating where the threads end.

RE: Bolt Threads in a Shear Plane

In a tapped bolted joint I believe you will always have threads in the shear plane. If you stop the threads below the shear plane (assuming the bolt head is at the top), then the shank of the bolt is in the shear plane (which is good), however you can't thread a shank into a hole that is threaded for the same nominal size thread. The discussion of bolts in shear plane vs. bolts not in shear plane is only really valid when the bolt uses an external fastener, i.e., a nut, to tighten with and all members through which the bolt goes have shank-sized (or larger) non-threaded holes.

RE: Bolt Threads in a Shear Plane

GM has used recessed thread holes for the motor starters for years. The bolt has part of the shank knurled to get it to fit tighter in the starter hole and the non-threaded part of the hole in the block. That allows the bolts to locate the starter and keep it straight on the block. So, it is possible to do it that way. Easier would be to just design to the lower shear of the threaded part of the bolt.

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close