×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Need UNC & Acme Thread Gauge Dimensions Please

Need UNC & Acme Thread Gauge Dimensions Please

Need UNC & Acme Thread Gauge Dimensions Please

(OP)
Anyone have a chart or website of dimensions required to machine thread gauges? I had a chart a few years back but they changed my computer and nuked half the hard drive data.

Web search hasn't turned up anything worth a darn yet, but I'll keep trying.

Need Male and Female (ie stud and nut)Gauge dimensions for 1.25 and 1.75 UNC for now.

Thanks in advance!

"If A equals success, then the formula is: A = X + Y + Z, X is work. Y is play. Z is keep your mouth shut."
-- by Albert Einstein

RE: Need UNC & Acme Thread Gauge Dimensions Please

Machinery Handbook

RE: Need UNC & Acme Thread Gauge Dimensions Please

(OP)
Thanks folks!!

"If A equals success, then the formula is: A = X + Y + Z, X is work. Y is play. Z is keep your mouth shut."
-- by Albert Einstein

RE: Need UNC & Acme Thread Gauge Dimensions Please

(OP)
The ANSI book should be here in a week or 2 according to our Purchasing Dept.
Meantime - would one of you be kind enough to give the ANSI dimensions for this one?
1.25 UNC
GO gage, plain ring, to check External thread (at Max mat'l condition) and Internal Thread Plug (ditto)

Thanks again!

"If A equals success, then the formula is: A = X + Y + Z, X is work. Y is play. Z is keep your mouth shut."
-- by Albert Einstein

RE: Need UNC & Acme Thread Gauge Dimensions Please

(OP)
Finally got the Machinery Handbook (27th) back and I'm a bit confused.
Reading the specs: Table 5 (pg 1918)  
Plain gage, Major Dia of Ext thread (ie shaft)
GO = Max Major dia, gage tolerance is minus
Plain gage, Minor Dia of Internal thread (ie nut)
GO = Max Major dia, gage tolerance is plus


For 7 pitch, the gage tolerance is 0.0007"
So for a 1.25-7 UNC 2B male thread, the Max Major Dia is 1.2478 minus the gage tolerance yields a gage diameter of 1.2471
OR - does the gage tolerance subtract from the 1.250 3A diameter for a gage diameter of 1.2493?

It would seem to me that the 0.0007 should be added to the Major diameter 2B dimension so the gage can be threaded on. This way parts at the Max Mat'l limit would still pass.

Do I just have my Blonde hat on today or is the chart BassAckwards?

Thanks!

"If A equals success, then the formula is: A = X + Y + Z, X is work. Y is play. Z is keep your mouth shut."
-- by Albert Einstein

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


Resources

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