For Cutting Tap Unified Coarse Thread (UNC)

SP

Basic Pitch (+) μm Dia.

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420

P3 P5 P4 SL

3B 2BX 3B 197

1 3/8-6 UNC 2B 2B 263

GH4 GH6 GH8 1B 392

GH9 PO

P3 P6 P4

3B 2BX 3B 199

1 1/2-6 UNC ST 2B 2B 265

GH4 GH6 GH8 1B 400

GH9

ROLL

3B 2BX CARBIDE

2B Internal threads 3B Internal threads 2B Internal threads 1B

LONG

HAND

TAPS

EG (STI)

SPECIAL

THREADS,

GAUGES

THREAD

MILLS

DIES

CENTER

DRILLS