S O M T A P 1 2 C A T A L O G U E
181
THREADING
TOOLS
Tap Terminology
GENERAL SPECIFICATIONS
SIZE OF SQUARE
ACROSS FLATS
SECTION B-B
FLUTE
WEB
THICKNESS
SECTION A-A
B
B
SHANK
DIAMETER
A
A
LEAD
ANGLE
NOMINAL
DIAMETER
ROOT
DIAMETER
SQUARE
LENGTH
OVERALL LENGTH
THREAD LENGTH
CHAMFER LEAD
LAND
CUTTING
FACE
THREAD
METRIC
METRIC LONG SERIES
METRIC
UNC, UNF
BSW, BSF, BA, BSB
BSP, BSPT
NPS, NPT
GENERAL SPECIFICATIONS
ISO 529
ISO 2283
DIN 371 / DIN 374 / DIN 376
ISO 529
ISO 529
ISO 2284
ANSI 94.9 1979
THREADS GROUND TO
ISO 2857 - 1973, CLASS 2
ISO 2857 - 1973 CLASS 2
DIN 802 CLASS 6H
ANSI B1.1 1982 2B
BS 949: 1976 CLASS 2
BS 949: 1976 1976-G SERIES
ANSI 94.9 1979
