NPT and BSPT explained.
02-21-2002, 10:18 AM
#1
New User
Thread Starter
Join Date: Jul 2001
Location: Southbay, CA, USA
Posts: 555
Likes: 0
Received 0 Likes
on
0 Posts
NPT and BSPT explained.
I'm sitting here with my McMaster-Carr catalog and found the section describing the difference between these two kinds of pipe thread.
National Pipe Taper (NPT) threads are most widely used in North America. The distinguishing characteristics are that they have flattened peaks and valleys with the valley angle being 60 degrees.
British Standard Pipe Taper (BSPT) threads are the European equivalent to NPT threads. The peaks and valleys are rounded and the valley angle is 55 degrees.
Pipe size, Pipe OD, threads per inch NPT, threads per inch BSPT:
1/8", 0.405", 27, 28
1/4", 0.540", 18, 19
3/8", 0.675", 18, 19
1/2", 0.840", 14, 14
3/4", 1.050", 14, 14
1", 1.315", 11.5, 11
So in a nutshell, I hope this is enough information to discourage people from jamming NPT fittings into their Honda blocks!
National Pipe Taper (NPT) threads are most widely used in North America. The distinguishing characteristics are that they have flattened peaks and valleys with the valley angle being 60 degrees.
British Standard Pipe Taper (BSPT) threads are the European equivalent to NPT threads. The peaks and valleys are rounded and the valley angle is 55 degrees.
Pipe size, Pipe OD, threads per inch NPT, threads per inch BSPT:
1/8", 0.405", 27, 28
1/4", 0.540", 18, 19
3/8", 0.675", 18, 19
1/2", 0.840", 14, 14
3/4", 1.050", 14, 14
1", 1.315", 11.5, 11
So in a nutshell, I hope this is enough information to discourage people from jamming NPT fittings into their Honda blocks!
02-21-2002, 10:22 AM
#2
Member
Join Date: Sep 2001
Posts: 1,071
Likes: 0
Received 0 Likes
on
0 Posts
Re: NPT and BSPT explained. (mercury)
the back of the block is 1/8 bspt...(i know that)
how about the hole near the vtec solenoid on a
b series VTEC head...is it the same ..?????
thanks much.!
how about the hole near the vtec solenoid on a
b series VTEC head...is it the same ..?????
thanks much.!
02-21-2002, 02:26 PM
#4
New User
Join Date: Aug 2001
Location: San Jose, CA, 95132
Posts: 620
Likes: 0
Received 0 Likes
on
0 Posts
Re: NPT and BSPT explained. (Tom)
so does anyone know why a 1/8" BSPT male will go into a 1/8" NPT female no problem? It makes sense to me that it doesn't work the other way around but I can't figure out why it does work this way...
-Xerxes
-Xerxes
Thread
Thread Starter
Forum
Replies
Last Post
Diyracing2
Welding / Fabrication
3
01-16-2007 03:48 PM
redzcstandardhatch
Welding / Fabrication
2
12-15-2005 06:13 AM
