VMECA Vacuum Technology - I - VTEC/VMECA - #9

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VACUUM TECHNOLOGY 8 Specifications subject to change without notice. www.vmeca.com Thread Systems Cylindrical metric thread: designated with the letter M. Example M5. Cylindrical inch thread (also called Unified thread): designated with the letter UNF Example 10-32UNF. ISO THREAD: The dry seal system consists of cylindrical and conical pipe-threads. The threads have a 60�Bprofile angle and are scaled without packing or seal rings (Please note that when these are used in other combination of thread systems, that “sealing” is not applicable). The dimensions are given in inches and VMECA’s catalogue uses the letters NPT and NPSF: Conical thread is designated NPT. Example: 1/8��NPT Cylindrical thread is designated with the letters NPSF. Example :1/8��NPSF DRY SEAL THREAD (AMERICAN SYSTEM OF PIPE THREADS): The threads have a 55�Bprofile angle and are dimensioned in inches. Cylindrical thread is designated with the letter G. Example: G1/8��. BSP THREAD (BRITISH SYSTEM OF PIPE THREADS): Please note that some thread size in different thread systems not always fit. See below table. COMPATIBILITY OF DIFFERENT THREAD SYSTEMS: M5 male + + + + M5 fem. G1/8" male G1/8" fem. G1/4" male G1/4" fem. G3/8" male G3/8" fem. G1/2" male G1/2" fem. G3/4" male G3/4" fem. G1" male G1" fem. G2" male 10-32UNF fem. or male 1/8"NPSF female 1/8"NPT fem or male 1/4"NPSF female 1/4"NPT fem or male 3/8"NPSF female 3/8"NPT fem or male 1/2"NPSF female 1/2"NPT fem or male 3/4"NPSF female 3/4"NPT fem or male 1"NPT fem or male 2"NPT fem or male + + + - + + - - - - - + - + + + - - - - + + + + + + + Fits + Fits short thread - Does not fit