Pipe Thread Designations
These standard pipe threads are formally referred to by the following sequence of blocks:
- the words "Pipe thread",
- the document number of the standard (e.g., "ISO 7" or "EN 10226")
- the symbol for the pipe thread type:
- G = external + internal parallel (ISO 228)
- R = external taper (ISO 7)
- Rp = internal parallel (ISO 7/1)
- Rc = internal taper (ISO 7)
- Rs = external parallel
- the thread size
Threads are normally right-hand. For left-hand threads, the letters "LH" are appended.
Example: Pipe thread EN 10226 Rp 2½
The terminology for the use of G and R originated from Germany (G for gas, as it was originally designed for use on gas pipes; R for rohr (meaning pipe).)
Read more about this topic: British Standard Pipe Thread
Famous quotes containing the words pipe and/or thread:
“If you love music, hear it; go to operas, concerts and pay fiddlers to play to you; but I insist on your neither piping nor fiddling yourself. It puts a gentleman in a very frivolous, contemptible light.... Few things would mortify me more than to see you bearing a part in a concert, with a fiddle under your chin, or a pipe in your mouth.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)
“Tom Hyde, the tinker, standing on the gallows, was asked if he had anything to say. “Tell the tailors,” said he, “to remember to make a knot in their thread before they take the first stitch.” His companion’s prayer is forgotten.”
—Henry David Thoreau (1817–1862)