Page 249 - All Industrial Tool Supply | General Catalog

Technical Data • TAPS
247
247

Finish/Coating
• AG Coated: TiAlN Multi-Layer Coating – Outstanding thermal and • Steam/Black Oxide: An inexpensive black
chemical resistance properties increase the stability of the coating, this black oxide coating provides heat
cutting edge & improve chip flow. resistance and lubricity, as well as corrosion
resistance. These result in a longer tap life than
• AlTiN: Aluminum Titanium Nitride Coating – Ideal for high temperature possible for the typical uncoated high-speed
cutting operations in titanium and nickel alloys, stainless steel, steels steel taps. For tapping of ferrous metals such as
and cast irons. It creates a hard aluminum oxide layer as temperature steel, stainless steel and cast iron.
increases, insulating the tool and transfering heat into the cutting chips.
• TiAIN Coated: Super Life Titanium Aluminum Nitride – Dark Violet/ Black –
• Bright: Surface is untreated. Use for general purpose tapping of considered superior to TiCN and can extend tool life five or more times.
most metals, wood and plastic. More stable at higher temperatures than TiN or TiCN. Increases machining
speeds by 75% to 100%.
• Chrome Plated: Bright chrome – plating process developed to
increase tap life and impart an anti-galling surface. Chrome is considered • TiN Coated: Long Life Titanium Nitride - Bright Gold - is a very
a heavy metal and will produce hazardous dust when ground. hard ceramic material and when used to coat a high-speed steel
Using breathing protection is highly recommended when regrinding tap can extend the cutting life by three or more times. Increases
chromed tools. Recommended usage for all non-chromium materials. machining speeds by 25% to 30%.
• TiCN Coated: Extra-Life Titanium Carbonitride – Violet/Blue-Gray -
• DLC Coated: Diamond like carbon coating for tapping in aluminum, superior to TiN and more wear resistant. Increases machining speeds
alloy and copper.
by 35% to 50%.
• SG Coated: Silicone Multi-Layer Coating – For high performance tapping
of carbon steels, stainless steels, aluminum and high-temp alloys.
tool Materials
Material choices will effect tap life, productivity and workpiece finish.

Cobalt: Provides higher hardness, toughness and better wear resistance than high speed steel. Little chipping or
microchipping under extreme cutting conditions, allowing the tool to run 10% faster than high speed steel.

High Speed Steel: Combines good tool life and productivity with minimal cost. Works well in free cutting
and carbon steels as well as non-ferrous, soft materials such as bronze, copper, brass and aluminum.

Powdered Metal: PM – Provides superior wear life in tapping exotic alloys, abrasive materials & provides good heat resistance.

Solid Carbide: Designed for high performance applications when tapping in tough steels and abrasive materials.

Vanadium: Provides superior wear resistance and is specially heat-treated for toughness.

thread liMit explanation
H (Fractional Size Reference) & D (Metric Size Reference)
The H or D limit is defined as a value over the basic pitch diameter of a tap.
Tap limits are best suited to produce the class of fit desired. If threads are too loose,
then smaller limits are required. If threads are too tight then larger limits are required.
It is recommended to select the largest limit possible to produce the proper class of
fit and maximize tool life.
Values:
H1 / D1 Basic to basic + .0005".
H2 / D2 Basic + .0005" to + .001".
H3 / D3 Basic + .0010" to + .0015".
H4 / D4 Basic + .0150" to + .0020".
H5 / D5 Basic + .0020" to + .0025".
H6 / D6 Basic + .0025" to + .0030".
(D Limits have slightly different values)

Class oF Fit
System that relates standard screw thread classes to specific tap tolerance limits.
Class A: External
Class B: Internal
Class 1A & 1B: Quick & loose assembly.
Class 2A & 2B: For medium loose that eliminates seizure in assembly. For screws and bolts.
Class 3A & 3B: Thread accuracy is needed and gages are used to ensure a proper, tight fit.