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When producing threads with taps certain criteria must be considered before the “tapping” can take place.

Make sure that the drill used to produce the hole prior to tapping is not excessively worn, too often tap failure is caused by a worn drill locally work-hardening the periphery of the bore, similarly this occurs when pre-countersinking or centering.

When using tension and compression chucks these must be in good working order and have no tendency to “float or jam” but they must offer the correct resistance otherwise pitch errors may arise.

When rigid tapping make sure that a clearance or safety level is set correctly before the tap begins to enter the drilled hole. If the clearance level is small the problem arises with the machine rpm not synchronizing with the feed causing pitch error and bell mouthing.

Coolant direction is critical when tapping as the threading portion of the workpiece is nearly always the final operation. Direction must be directly from above and in the direction of the flutes to ensure good cooling at the depth required. This also helps to produce the correct chip formation and avoids cold welding of the material to the tool, which in turn helps to prevent poor tool life.

Tap Choice

From the vast range of taps available here is a small selection for common use.

Fraisa X-Tap

High performance tap made from specially prepared powder metallurgy substrate HSS, available with two coatings TiCN for high strength steels, or Tribo for stainless steel. Also suitable for normal steels and cast iron given certain conditions apply.

Thread forms available in spiral point and spiral flute, M, MF, BSP, UNC, UNF.

Fraisa E-Tap

Cost effective tap for general purpose mixed production of low strength steel, stainless and aluminium. Made from a specially formulated powder metallurgy steel demonstrating extreme toughness, E-Tap is ideal for small batch work on modern machine tools and performs equally well on older, less reliable machine tools.

Available as spiral point in M, and spiral flute in M, MF, BSP, UNC, UNF

Fraisa Ti-Tap

As the name suggests Ti-tap is made specifically for Titanium and its alloys. Thread forms are M (ISO 2) and M (ISO 1) in spiral point and flute.

Fraisa Alu-Tap

Alu-Tap is manufactured with an open aggressive geometry specifically designed for aluminium that also works well in copper, low strength steel and certain stainless steels in both spiral point and flute. It also comes as a cold forming or roll tap and is also made for helicoil tapping (EG).

The roll tap version comes with or without oil grooves as standard options.

Fraisa Polytap-R

Designed purely for mixed production on machines with synchronized spindles able to perform rigid tapping, the geometry of Polytap-R allows for most materials to be threaded and is complemented by a TiCN coating.

Numerous other thread forms and material specific taps are available, such as N-Tap for nickel based alloys and H-Tap for high strength steel. Contact your local Jemma Engineer for details.


Products	Threading - Tapping
Abrasives (bonded) Abrasives (coated) Adhesives Back Ends Back spot facing tools Burrs Calibration Carbide tools (indexable) Carbide tools (solid) Chucks Clamping elements Cleaning products Coolants Collets Countersinks Cutting Tools Cutting Oils Dividing heads Dovetail cutters Drills Drill bits Engraflexx Engraving tools (micropercussion) Engraving tools (HSS/Carbide solid) Files Fixture plates Gauges Gravostar Grinding wheels Ground Flat Stock Hacksaw blades Hand Tools Hand cleaners Hole saws Hygiene products Indexing heads Indexable inserts Indexable tooling Inverted dovetail cutters Janitorial products Lubricants Measuring equipment Milling tools (indexable) Milling tools (solid) Oils Optical devices Paper products Power tools Power saw blades Precision equipment Precision tools Protective clothing Quintus setting devices Reamers (HSS/Carbide/ Indexable) Regrinds Saws Saw blades Screws Silver steel Sockets Socket sets Speed increasers Spindle tooling Taps & Dies Threading tools (indexable) Threading tools (solid) Toolholders Turning tools Universal adaptors Vices Vice jaws Vice towers Workholding	When producing threads with taps certain criteria must be considered before the “tapping” can take place. Make sure that the drill used to produce the hole prior to tapping is not excessively worn, too often tap failure is caused by a worn drill locally work-hardening the periphery of the bore, similarly this occurs when pre-countersinking or centering. When using tension and compression chucks these must be in good working order and have no tendency to “float or jam” but they must offer the correct resistance otherwise pitch errors may arise. When rigid tapping make sure that a clearance or safety level is set correctly before the tap begins to enter the drilled hole. If the clearance level is small the problem arises with the machine rpm not synchronizing with the feed causing pitch error and bell mouthing. Coolant direction is critical when tapping as the threading portion of the workpiece is nearly always the final operation. Direction must be directly from above and in the direction of the flutes to ensure good cooling at the depth required. This also helps to produce the correct chip formation and avoids cold welding of the material to the tool, which in turn helps to prevent poor tool life. Tap Choice From the vast range of taps available here is a small selection for common use. Fraisa X-Tap High performance tap made from specially prepared powder metallurgy substrate HSS, available with two coatings TiCN for high strength steels, or Tribo for stainless steel. Also suitable for normal steels and cast iron given certain conditions apply. Thread forms available in spiral point and spiral flute, M, MF, BSP, UNC, UNF. Fraisa E-Tap Cost effective tap for general purpose mixed production of low strength steel, stainless and aluminium. Made from a specially formulated powder metallurgy steel demonstrating extreme toughness, E-Tap is ideal for small batch work on modern machine tools and performs equally well on older, less reliable machine tools. Available as spiral point in M, and spiral flute in M, MF, BSP, UNC, UNF Fraisa Ti-Tap As the name suggests Ti-tap is made specifically for Titanium and its alloys. Thread forms are M (ISO 2) and M (ISO 1) in spiral point and flute. Fraisa Alu-Tap Alu-Tap is manufactured with an open aggressive geometry specifically designed for aluminium that also works well in copper, low strength steel and certain stainless steels in both spiral point and flute. It also comes as a cold forming or roll tap and is also made for helicoil tapping (EG). The roll tap version comes with or without oil grooves as standard options. Fraisa Polytap-R Designed purely for mixed production on machines with synchronized spindles able to perform rigid tapping, the geometry of Polytap-R allows for most materials to be threaded and is complemented by a TiCN coating. Numerous other thread forms and material specific taps are available, such as N-Tap for nickel based alloys and H-Tap for high strength steel. Contact your local Jemma Engineer for details. For further information download the PDFs below:- Fraisa Tapping Technology 2006 Catalogue - Click Here Other Links:- Tapping Thread Turning Thread Milling Print This Page