For Forming Tap Unified Fine Thread (UNF) Intro

Basic Pitch (+) μm Dia.

0204060160 140 120 100 80
3B3BX 2BX42
No.0-80 UNF2BG3G557
H2
3B3BX 2BX47
No1-72 UNF2BG3G563
H2
3B3BX 2BX 50
No.2-64 UNF2BG468
H2 H3
3B3BX 2BX53
No.3-56 UNF2BG471
H2 H3
3B3BX 2BX58
No.4-48 UNF2BG4G578
H3H5
3B3BX 2BX60
No.5-44 UNF2BG4G580
H3H5
3B3BX2BX 63
No.6-40 UNF2BG586
H3H5
3B3BX 2BX67
No.8-36 UNF2BG590
H3H5
3B3BX 2BX73
No.10-32 UNF 2BG5G698 G7
H4H6
3B3BX2BX77
No.12-28 UNF 2BG6105
H4H6
3B3BX2BX81
1/4-28 UNF2BG6108 G7
H4H6
3B3BX 2BX90
5/16-24 UNF2BG6121
H5H7
3B3BX93 2BX
3/8-24 UNF2B124 G7
H5H7
3B3BX 2BX104
7/16-20 UNF2B137 G7
H5H7
3B3BX 2BX106
1/2-20 UNF2B141 G7
280 260 240 220 200 180 300420 400 380 360 340 320
SP
SL
3BX, Class G, Class H for 3B internal threads
2BX, Class G, Class H for 2B internal threads
internal threads 3B
PO
internal threads 2B
ST
ROLL
CARBIDE
LONG
HAND
TAPS
EG (STI)
SPECIAL
THREADS,
GAUGES
THREAD
MILLS
DIES
CENTER
DRILLS

H5 H7