Heli-Coil drilling data – inch. INCH – DRILLED HOLE DIMENSIONS. Suggested Drill Size. Nominal. Thread size. Aluminum. Steel,Magnesium,Plastic. UNIFIED. Tap Chart Helicoil Threads – provides tap sizes and drill sizes for Helicoil threads. Heli-Coil has the most effective and universally accepted method of thread repair. Heli-Coil inserts quickly and permanently restore stripped, worn or damaged.

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This type of tap has over 4 pitch thread chamfer.

For Screw- Lock inserts, a tolerance class 4H5H or 3B is recommended in order to develop higher locking torques. Conventional shop practice and production procedures, speeds, feeds and nelicoil should be used in chatt with proper fixturing and good tapping machines or tapping heads.

Helicool tapped hole must be held within the stated pitch diameter limits for the required class of fit for the installed Heli-Coil insert. Minimum Major Diameter [D min ].

Tap Chart Helicoil Threads

Helicoil inserts are screw thread bushings coiled from wire of diamond shape cross-section. AmesWeb Calculators Screw Threads. Minimum Tapping Depth [T min ]. Minimum Tapping Depth [T min ]. The Fine series is suitable when the resistance to stripping of both external and mating internal threads equals or exceeds the tensile load carrying capacity of the externally threaded member.

Tap Chart Helicoil Threads — provides tap sizes and drill sizes for Helicoil threads. External threads of this Fine Series have greater tensile stress area than comparable sizes of the coarse series. Helicoil Tap Drill Chart and Helicoli Bottoming style tap is ideal for blind holes that require threads to be close to the bottom of the hole.

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Nominal Size in Inches and Threads per Inch.

HELICOIL SCREW THREAD INSERT (STI) TAPPED HOLE DIMENSIONS

Helicoil Tapping Data — Metric Heli-Coil taps in various types and styles produce holes for Tolerance Classes 4H5H or 3B and 5H or 2B for use in the general range of aluminums, magnesiums, mild steels, free machining stainless steels and other free machining materials. It is also used where the length of engagement is short, where a smaller lead angle is desired, where the wall thickness demands a fine pitch, or where finer adjustment is needed.

They are fit into thread tapped holes to form internal threads with nominal size. The Fine series is suitable when the resistance to stripping of both external and mating internal threads equals or exceeds the tensile load carrying capacity of the externally threaded member.

Helicoil inserts are diametrically larger than the tapped hole. Heli-Coil taps in various types and styles produce holes for Tolerance Classes 4H5H or 3B and 5H or 2B for use in the general range of aluminums, magnesiums, mild steels, free machining stainless steels and other free dhart materials. External threads of this Fine Series have greater tensile stress area than comparable sizes of the coarse series.

A thread form used by the United Kingdom, Canada, and the United States to obtain screw thread interchangeability among these three nations. For Standard free running insertsa tolerance class 5H or 2B is recommended. The higher and more consistent torques are met by the screw locking inserts when assembled and tested in Class 3B tapped holes. Minimum Minor Diameter [D 1min ]. Minimum Drilling Depth [G].

During the assembly operation, the diameter of the leading coil is reduced due to applied torque and this permits it to enter the tapped thread. They are fit into thread tapped holes to form internal threads with nominal size.

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This thread form is used in materials with fhart tensile strength which makes threads more resistance against stripping internal threads. Minimum Pitch Diameter [D 2min ]. This thread chaft is used in materials with low tensile strength which makes cchart more resistance against stripping internal threads.

Bottoming style tap is ideal for blind holes that require threads to be close to the bottom of the hole. This type of tap has over 4 pitch thread chamfer. This type of tap has only 1 to 2 pitch thread chamfer. Maximum Minor Diameter nelicoil 1max ]. Minimum Drilling Depth [G].

Technical Specifications

Plug Tap Bottoming Tap. Plug style tap is widely used in through holes and where there is sufficient room at the bottom in blind holes. Plug style nelicoil is widely used in through holes and where there is sufficient room at the bottom in blind holes.

Most commonly used type for general engineering applications. During the heliciol operation, the diameter of the leading coil is reduced due to applied torque and this permits it to enter the tapped thread.

It is also used where the length of engagement is short, where a smaller lead angle is desired, where the wall thickness demands a fine pitch, or where finer adjustment is needed.