Questions About Thread Types

http://homepages.tesco.net/~A10bsa/bswgo.htm

Hey this could be fun. We all get to name a thread type....

....I pick: The often over looked "knuckle thread" as on light bulbs.

Thank you. thank you very much.

My turn, my turn!

I chose...........butress thread.

The Edison Screw thread?

My favorite is "Acme"

NPT = National Pipe Thread

BST Unknown (Best Sink Thread?)

BST = British Standard Thread

I don't think there is a British standard thread. Ever since Joseph Whitworth set out to standardise screw threads we have used many different thread types. I can think of BSW, BSF, BA, BSB, British cycle threads, square threads, buttress threads, Acme, Lowenherz and of course we also adopted the American unified threads. These have largely been replaced by the ISO metric series but some of the old ones still crop up.

Hi,

I think you might mean BSP, which stands for British Standard Pipe (thread)

Deseng

Threads are the spiraling protrusions on the surface of a cylindrical object place there for mechanical attachment.

Because of the distance between the different peoples of this world during the development of this type mechanical fastening. There are many some i do not know about.

Difference between BST & NPT 3000 miles of ocean

BSP

http://en.wikipedia.org/wiki/British_Standard_Pipethread

Deseng

HI,

DEAR SIR,

LOOK AT THE MEANING OF WORD ' THREAD' , WHICH I KNOW.

THREAD IS A THIN CORD , MAIN THOUGHT , SLOPING RIDGE OF SCREW.

THERE ARE MANY TYPES OF THREADS IN USE SOME OF THEM

AS BS, UN, BUTTRESS,ACME, KNAUCAL, ISO,METRIC AND SO ON YOU CAN

FIND IN MACHINERY HAND BOOK OR OTHER ENGG. BOOK.

'B S T' IS NOT THREAD TYPE IT IS BS FOR FASTNERS & MECHANICAL

WORK, AND 'B S P T' FOR PIPE,PIPE FITTINGS. THIS IS BRITISH STANDARD PIPE

THREAD HAVING THREAD ANGLE IS 55 DEG.

'N P T' IS AMERICAN STANDARD NATIONAL PIPE THREAD, HAVI THRAD

ANGLE 60 DEG. i e. ANGLE OF V GROOVE OF THREAD.

I THINK NOW THING MUST BE CLEAR TO YOU , YOU CAN ALSO REFER

THE SITES SUGGESTED BY OUR CR4 COMMUNITY FRIENDS.

THANK YOU

V.D.DEODHAR.

dear sir,

the thread angle, 60deg included(American standard) vs 55deg included (metric)is all fine and good. The differentiating point here between a 'straight' thread and 'pipe' is the taper.

sometimes 'BS' may be used to blanket externally threaded fasteners both bolt and screw in reference to fastener type only, thus 'BS'

The norm is as follows: BSW=brit. stand. Whitworth; BSP= Brit. std. pipe; BSPT=Brit. std. pipe taper. Those are the only common 'BS--' abbreviations commonly used that I am aware of.

There is a tremendous amount of data regarding the cutting of threads by machine. All relative to innumerable variables. Asking the question that was presented is akin to saying, "What's a gear?"

By the way the first 'threads' were used as gears- transmission of power long before fastening devices.

screw it

Just a small correction, both Unified & ISO metric threads are 60° inclusive, 55° was used for the Whitworth series, BSW & BSF threads.

don't u mean either weavened, weaveded, or woveneded...?

The best way to have all the thread questions answered is to obtain a copy of The Machinery's Handbook and study it.

Does anyone know where I can find standards on BSRT round/knuckle threads for pipe? 2.5" pipe to be exact. Need to place thread on end of the pipe to attach a hose to it.

This inexpensive software displays extensive dimensional data for a large number of thread types. A demo is available.

http://mrainey.freeservers.com/METhreadPal.html