Widia GTD (formerly Greenfield) High
Performance (HP) Tap Series Overview
Widia GTD (formerly Greenfield)'s HP Tap Series is designed and
manufactured for successful threading in a variety of part
materials for high and low volume applications. These materials
include aluminum, stainless steels, nickel alloys, titanium
alloys, mold steels, irons, brass, bronze and plastics.
Their formulation of the premium steel tap
base material is unique for each intended application. Special
geometry and tap surface treatment interacts with the premium
steel to offer the highest level of performance.
Widia GTD (formerly Greenfield) taps use a blend of tungsten,
vanadium or cobalt HSS powdered metals. The right combination
improves tap performance resulting in improved product finish
and pitch diameter size. These taps have excellent abrasion
resistance and are designed for both high and low volume production.
When it's important to get that one extra hole, Widia GTD (formerly Greenfield)
taps maintain the same quality as the very first tapped hole.
Special tool geometry creates less torque
during tapping, better removal of chips, and runs cooler.
CNC necked design increases flow of coolant to the cutting
teeth and reduces surface contact between the tool and the
work piece for more efficient threading. Cutting face geometry
and thread relief are a major design criteria for each tap.
These taps are suitable UNJ Aerospace internal threading applications.
All taps meet USCTI and ANSI standards dimensions. All new
taps meet USCTI and ANSI standard dimensions on DIN length
of Styles and Sizes
Styles include spiral point Gun®,
spiral flute, extended 6" length, STI taps, and taper
pipe taps. HP Gun® taps are highly recommended for tapping
through holes. Gun® taps "shoot" the chips forward
ahead of the taps, reducing loading and clogging of the flutes.
For blind holes, spiral fluted taps are recommended.
More sizes available
Depending on the style of tap, sizes ranging
from #2 to #12 machine screw and from 1/4" to 2"
fractional are available.
Broadest Offering of
Pitch diameters from H2 to H7 and metric
pitch diameters from D3 to D7 are stocked as standard in many
styles, at no premium in price. With rigid setups higher pitch
diameter limits can be used for longer tool life. Widia GTD (formerly Greenfield)
HP Tap series offers a choice in selection of tap size best
suited to produce the class of thread desired.
Choice of Bottoming or Modified Bottoming
Only Widia GTD (formerly Greenfield) offers the selection of
two chamfers for blind hole tapping. Modified bottoming has
3 to 4 pitches when sufficient drill depth is available. This
is the preferred chamfer for successful blind hole tapping.
Full bottoming taps, having 1 to 2 pitches, are designed when
threads must extend close to the bottom of the drilled hole.
Availability of Coatings to Match the
Most of the taps listed in the HP Tap Series
are offered as bright, oxide surface treated, titanium nitride
coated (TiN), and titanium carbonitride coated (TiCN). Surface
treatments enhance the tap's ability to move chips, lubricity
and wear life. Bright taps are coated with TiN or TiCN at
Widia GTD (formerly Greenfield)'s Lyndonville, Vermont facility. TiN and TiCN coated
taps are highly recommended for superior quality of thread
and for higher production.