High speedsteel

Pointed threads have a flank angle of 60° (metric) or 55 degrees (Whitworth) and are used as fastening threads. They are designed to tighten nuts and bolts. They have a large flank angle and a small pitch angle. This results in greater friction.

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Preheat to 1200-1400°F (649-760°C) and equalize. Then heat rapidly to 2000-2100°F (1093-1149°C) and equalize prior to forging. Reheat if work piece temperature falls below 1800°F (982°C). After forging, cool slowly to ambient temperature in the furnace or buried in insulating material, then anneal as described above.

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In today’s article we will take a closer look at thread profiles. The main focus is on the outer diameter, the core diameter, the flank diameter.

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Cobalt Steelhardness

Saw threads have a flank angle of 33° and an asymmetrical thread profile. They are therefore used where a high load is applied on one side.

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The minimum and maximum dimensions of the outside diameters, the flank diameter and the core diameter are specified in the table of limit dimensions of DIN 13 – 20. The limit dimensions are listed for the common tolerance classes.

Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1500-1575°F (843-857°C), and hold for 1 hour per inch (25.4 mm) of thickness, minimum of 2 hours. Then cool slowly with the furnace at a rate not exceeding 50°F per hour (28°C per hour) to 1000°F (538°C). Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be 269 HBW or lower.

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Quenching: Pressurized gas, warm oil, or salt. For pressurized gas, a rapid quench rate to below 1000°F (538°C) is critical to obtain the desired properties. For oil, quench until black, about 900°F (482°C), then cool in still air to 150 -125°F (66-51°C). For salt maintained at 1000-1100°F (538-593°C), equalize, then cool in still air to 150 -125°F (66-51°C).

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The profile angle β and the lead angle π determine the geometrical shape of the thread.  The lead angle of a thread can be derived from the following formula: Tan α = P / d2 x π .

The core diameter (d1, D1) is the smallest diameter on a thread. It is the diameter of an “imaginary” cylinder (inner cylinder) which excludes the profile tips of an inner thread or the profile valleys of an outer thread.

M42 exhibits excellent wear resistance by virtue of high heat-treated hardness (68 to 70 HRC), and the high cobalt content imparts the hot hardness. As such, the cutting edges on tools made from M42 super high speed steel stay sharp and hard in heavy-duty and high-production cutting applications.

Cobalt steelColor

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The outer diameter (d, D) is the largest diameter on a thread. The designation of a thread is determined by the outer diameter. Therefore it is also called nominal diameter. It is the diameter of an “imaginary” cylinder that encloses the profile tips of an external thread and the thread valleys of an internal thread.

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Austenitizing (High Heat): Heat rapidly from the preheat. Furnace: 2150-2175°F (1177-1191°C) Salt: 2125-2150°F (1163-1177°C)

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The flank diameter (d2, D2) is located centrally between the outer diameter and the core diameter. Among other things, it is required to determine the lead angle of a thread. It is the diameter of an “imaginary” cylinder (flank cylinder) whose cylindrical surface cuts through the thread profile in such a way that the width of the profile valleys and peaks cut out as a result is equal.

Pointed threads have a flank angle of 60° (metric) or 55 degrees (Whitworth) and are used as fastening threads. They are designed to tighten nuts and bolts. They have a large flank angle and a small pitch angle. This results in greater friction.

Tempering: Temper immediately after quenching. Typical tempering range is 950-1050°F (510-566°C). Hold at temperature for 2 hours, then air cool to ambient temperature. Triple tempering is required.

M42 super high speed steel is a premium cobalt high speed steel with a chemical composition designed for high hardness and superior hot hardness. These properties make the steel an excellent choice for machining high-strength and pre-hardened steels, high-hardness alloys, and the difficult-to-machine, nonferrous super alloys used in the aerospace, oil, and power generation industries.

The size of the flank angle determines the intended use of the thread. Fastening threads have a larger point angle, motion threads a smaller point angle. The form therefore follows the function here too. In principle, threads have three functions: they connect (screw and nut), they move (spindle in a vice) and they “strengthen” forces (jack, wine press). Let us now look at some typical thread profiles: