Page 39 - HOLE_MAKING_CATALOG_INCH_2022_P373-P446

USER GUIDE
TAPS

Tap Designation Code Key

TPG UNC 1/4-20 M 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<109 Klbf/inch2 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>109 Klbf/inch 2
G - Grey Cast Iron

N - Low Alloy Steel Rm<87 Klbf/inch 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)

411