UK Stationary Engine Forum
 

Go Back   UK Stationary Engine Forum > Main Engine Section > The Workshop

Reply
 
Thread Tools Display Modes
Old 01-11-17, 10:00 PM   #1
Anton
Forum Supporter 2013
 
Anton's Avatar
 
Join Date: Feb 2008
Location: Groesbeek, the Netherlands
Posts: 397
Default Taps & dies

Please help!

what is the difference when I have a tap imprint 1/2 BSP 14TPI and a tap G 1/2" 14 TPI and a tap R 1/2 14 TPI???

Anton
Anton is offline   Reply With Quote
Old 01-11-17, 10:08 PM   #2
Lister M
Senior Member
 
Join Date: Jun 2009
Location: Bedfordshire
Posts: 3,908
Default

Anton,

Look at this link https://www.festo.com/wiki/en/Threads_in_pneumatics

Martin P
__________________
Lister optimum melius quam ceteri, quid tibi pro vita.
Lister M is offline   Reply With Quote
Old 01-11-17, 10:30 PM   #3
Anton
Forum Supporter 2013
 
Anton's Avatar
 
Join Date: Feb 2008
Location: Groesbeek, the Netherlands
Posts: 397
Default taps & dies

Quote:
Originally Posted by Lister M View Post
Anton,

Look at this link https://www.festo.com/wiki/en/Threads_in_pneumatics

Martin P
thanks for quick reply Martin, but maybe I must ask: can I use a G1/2" tap instead of a 1/2"BSP tap?

Anton
Anton is offline   Reply With Quote
Old 01-11-17, 11:04 PM   #4
cccst70
Member
 
Join Date: Sep 2016
Location: Cupar Fife
Posts: 30
Default

Quote:
Originally Posted by Anton View Post
thanks for quick reply Martin, but maybe I must ask: can I use a G1/2" tap instead of a 1/2"BSP tap?

Anton
1/2" G is the same as 1/2" BSPT which is the taper version.

make sure you don't run a taper thread all way thru a parallel as it will over cut on top of taper tap

NPT is slightly different thread angle I think also pitch is slightly different
cccst70 is offline   Reply With Quote
Old 01-11-17, 11:22 PM   #5
Hornet 6
Forum Supporter 2013
 
Hornet 6's Avatar
 
Join Date: Apr 2016
Location: Rochford
Posts: 1,742
Default

Quote:
Originally Posted by cccst70 View Post
NPT is slightly different thread angle I think also pitch is slightly different
BSP is 55 degree angle, NPT is 60
Some sizes swap around easily, some (like " BSP) will but it is really tight.
Although it will work at normal pressures, like water pumps etc, high pressure compressors (200psi +) and certainly hydraulics it will cause leaks.

Neil.
__________________
Wolseley WD 8, Stuart Turner P5, Maytag 92, Kubota KND3, Maytag 72, Villiers Marvil MkI.
Hornet 6 is offline   Reply With Quote
Old 01-11-17, 11:30 PM   #6
nickh
Forum Supporter 2013
 
nickh's Avatar
 
Join Date: Feb 2011
Location: Middx.
Posts: 12,227
Default

Quote:
Originally Posted by cccst70 View Post
(snip) 1/2" G is the same as 1/2" BSPT which is the taper version.
I presume the G = 'Gas' then but what is the 1/2" R?

NHH

Last edited by nickh; 02-11-17 at 10:20 AM. Reason: consistancy
nickh is offline   Reply With Quote
Old 02-11-17, 01:19 AM   #7
ListerHA2
Senior Member
 
ListerHA2's Avatar
 
Join Date: Oct 2011
Location: Cardiff
Posts: 463
Default

https://www.festo.com/wiki/en/Thread...or_R-thread.3F

"G-thread or R-thread?

G-threads have a cylindrical form in accordance with EN-ISO 228-1. R-threads have a conical form in accordance with EN 10226
In the case of a thread size 1/8", for example, the threads are specified as G1/8 or R1/8.
The following rules must be adhered to when using a combination of G and R-threads: Male G-threads (cylindrical) can only be screwed into female G-threads. Male R-threads (conical) can be screwed into female G or R-threads."
ListerHA2 is offline   Reply With Quote
Old 02-11-17, 10:07 AM   #8
nickh
Forum Supporter 2013
 
nickh's Avatar
 
Join Date: Feb 2011
Location: Middx.
Posts: 12,227
Default

Ah; R = 'Running' then.

EDIT; Sorry, t'other way round so I am none the wiser as to the origin of the G & R designations, probably looking for a logical 'reason' when there is none!

Thanks.

NHH

Last edited by nickh; 02-11-17 at 10:19 AM.
nickh is offline   Reply With Quote
Old 02-11-17, 02:14 PM   #9
Anton
Forum Supporter 2013
 
Anton's Avatar
 
Join Date: Feb 2008
Location: Groesbeek, the Netherlands
Posts: 397
Default taps & dies

thanks guys for all the information!

Anton
Anton is offline   Reply With Quote
Old 02-11-17, 03:36 PM   #10
AdeV
Forum Supporter 2011
 
Join Date: Nov 2008
Location: Merseyside, eh eh calm down
Posts: 534
Default

Quote:
Originally Posted by nickh View Post
Ah; R = 'Running' then.

EDIT; Sorry, t'other way round so I am none the wiser as to the origin of the G & R designations, probably looking for a logical 'reason' when there is none!

Thanks.

NHH
According to Wikipedia, they're from German: G for "gas" (as it was originally used on gas pipes, and "R" for "Rohr" = pipe). Which makes it about as clear as mud!
AdeV is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 11:54 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.