Page 376 - THREADING CATALOG

TAPS ½
Taps

Tap Designation Code Key

TPG UNC 1/4-20 M o HE

B - Bore for
Tap Style Coating Types*
Coolant
TPH - hand tap D - TPI (on request) HE - uncoated
TPF - forming tap D - pitch HS - uncoated
TPG - gun point HETI - TiN PVD coated
TPS - spiral flute HENI - nitrated
TPST - straight flute HEST - steam tempered

Thread Standard Tap Color Codes (1) Tap Materials
M - ISO metric coars M - MULTI-MATERIAL application HS - H.S.S. (M2)
thread DIN-13
MF - ISO metric fine W - steel with good machinability HE - H.S.S- E 5% Co.
thread DIN-13 Rm<750 N/mm 2 HSS (M35)
UNF - unfied fine thread S - stainless steel PM - compacted powder

UNC - unfied coarse thread H - hardened steel and high temp./ HM - solid carbide
super alloys Rm>750 N/mm 2
G - grey cast iron

N - low alloy steel Rm<600 N/mm 2

A - aluminum and aluminum alloys

F - any material with at least
8~10% elongation
(1) The tools have a matching colored ring around
the shank
Chamfer Lead According to DIN2197 (specified for each tool family)
A form a (chamfer lead 5-6 threads)

B form b (with gun-nose and chamfer lead 4-5 threads)

C form c (chamfer lead 2-3 threads)

D form d (chamfer lead 4-5 threads)
E form e (chamfer lead 1.5-2 threads)

ISCAR
374