Make your own free website on Tripod.com


MACHINISTS BOOKS

HOME METALWORKING BOOKS LINKS

 

 

STANDARD MARKS OR SYMBOLS ON TAPS

MARK

 

MEANING OF MARK

 

NC American National Coarse Thread Series
UNC Unified and American Coarse Thread Series
NF American National Fine Thread Series
UNF Unified and American Fine Thread Series
NEF American National Extra Fine Thread Series
UNEF Unified and American Extra Fine Thread Series
N American National 8, 12, 16 Thread Series (8n, 12N, 16N)
UN Unified and American 12 and 16 Thread Series (12UN, 16UN)
NH American (National) Hose Coupling and Fire Hose Coupling Threads
NM National Miniature Screw Thread
NGO American (National) Gas Outlet Thread
NS American Special Thread (60o thread form)
NPT American (National) Taper Pipe Thread
NPTF Dryseal American (National) Taper Pipe Thread
PTF Dryseal SAE Short Internal Taper Pipe Thread
ANPT Military Aeronautical Pipe Thread Specification MIL-P-7105
NPS American (National) Straight Pipe Thread
NPSC American (National) Straight Pipe Thread in Pipe Couplings
NPSF Dryseal American (National) Fuel Internal Straight Pipe Thread
NPSH American (Standard) Straight Pipe Thread for Hose Couplings and Nipples
NPSI Dryseal American (National) Intermediate Internal Straight Pipe Threads
NPSL American (National) Internal Straight Pipe Thread for Locknut Connections (loose fitting mechanical joints)
NPSM American (National) Internal Straight Pipe Thread for Mechanical Joints (free fitting)
NPTR American (National) Internal Taper Pipe Thread for Railing Joints (mechanical joints)
AMO American Standard Microscope Objective Thread
ACME C Acme Screw Thread -- Centralizing Type
ACME G Acme Screw Thread -- General Purpose Type
STUB ACME Stub Acme Threads
N. BUTT National Buttress Screw Thread

TO BUY BY CHECK

BACK TO ADVANCED MACHINISTS

BACK TO BASIC MACHINISTS

BACK TO GUIDES

BACK TO HOME SHOP MACHINISTS

 

Send mail to THZABEL@HOTMAIL.COM with questions or comments about this web site.
Copyright 2001 METALWORKING BOOKS
Last modified: December 08, 2001