Re: What's the difference between a UNJ and a UNR thread?

From: "Michael Rainey" <rainey47@xxxxxxxxxxxxx>
Date: Tue, 8 May 2007 10:04:33 -0400

"Bill Roberto" <upnrunning@xxxxxxxxxxxxx> wrote in message
news:VwT%h.9018$j63.2111@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Group,

I've been in this business for a long time and I know what a J thread form
should look like. I ran across a customer that had a print that specified
a UNR thread. The machinery handbook says smooth transition to a radius at
the root. What is the difference between the two?

Thanks in advance.

In a nutshell - UNJ external has a larger root radius than UNR, UNJ internal
has a larger minor diameter than UNR.

.

References:
- What's the difference between a UNJ and a UNR thread?
  - From: Bill Roberto

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Re: Whats the difference between a UNJ and a UNR thread?
... smaller root radius than the J form does. ... specified a UNR thread. ... UNR applies to external thread only, ... UNR threads is that optional rounded root radius. ...
(alt.machines.cnc)
Whats the difference between a UNJ and a UNR thread?
... I've been in this business for a long time and I know what a J thread form should look like. ... I ran across a customer that had a print that specified a UNR thread. ... The machinery handbook says smooth transition to a radius at the root. ...
(alt.machines.cnc)