Member Login

Remember Me
Forgot Password?
Join Us!

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!

Join Eng-Tips
*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.

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

locking taper angle

locking taper angle

Hi all,

what is the standard angle for a locking taper? Does it depend on mating materials?

A taper machined onto two mating parts such that when the parts are mated the frictional forces are so great will not rotate or move with respect to one another. No clamping forces are required to keep the parts joined, but considerable force is required to separate the items. This is an extremely rigid and accurate method of joining arbors and spindles.


RE: locking taper angle

I have always used 7 degrees as a rule of thumb. This is for steel on steel. It must change for different materials but I'm not sure by how much.

RE: locking taper angle

Look in Machinery's Hdbk is the section on "Standard Tapers"
Brown & Sharpe & Morse are locking [~2-3deg], whereas "Self releasing" tapers are 16 deg

RE: locking taper angle

the taper angle measured in radians should be less the coeficient of friction between the mating surfaces.

RE: locking taper angle

The way I remember it,is that approximately 7 degrees (Semi-Cone Angle) is the greatest angle that will "stick".

Morse, Brown and Sharpe, Jarno tapers, etc, are mostly less than 4 degrees a side, See "Machinery's Handbook"

Machine tool spindle tapers that use drawbars or other clamping devices tend to have much higher angles.

RE: locking taper angle

I have just completed the design of a Rope Socket, used in the wireline industry of the oilfield.  My taper angle was exactly 14 degrees, 7 degrees per side; this was stated above.

She works like a dream.  The semi-cone angle of 7 degrees is ideal for reasons discussed above.

Kenneth J Hueston, PEng
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

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!


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