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If UH-CT taps bind on the chips accumulated in the bottom of the hole, chipping problems may occur. Depth of the bored hole must be deeper than 5 threads, i.e., longer than the chamfer length of UH-CT taps.

Drill the bored hole as large as possible within thread tolerance because it helps reduce the torque load and tapping becomes easier. To learn more about the importance of bored hole size, see this link.

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4140steelComposition

If it is not possible to drill such a deep bored hole, clear chips after tapping the half of the overall tapping length and continue to tap again to the bottom. The bored hole table is a useful tool that helps you easily find the most suitable bored hole diameter for the selected size of the tap you are working with. You can download your copy for free here.

4140 steel is chromium, molybdenum, manganese steel with good toughness, impact resistance and fatigue strength. 1045 has slightly increased tensile strength and yield strength numbers than 1045 as a result of a slightly higher carbon content. Also, as a result of higher carbon content, 1045 is not as easy to weld as 4140.

We offer hot rolled bars, heat treated bars, billets, wire rods, and more in multiple grades, sizes, lengths, and shapes.

Whether a steel is hot rolled or cold drawn determines many of the mechanical properties. The majority of 1045 and 4140 steel is purchased in cold drawn state, but we provided two graphs of both hot rolled and cold drawn mechanical properties for both 1040 and 1045.

AISI 4140 equivalent material

With a variety of grades, it’s easy to make us your trusted source for cold drawn bar, turned and polished bar, cold drawn wire, and straightened and cut bar products.

It is easiest to see the differences chemical differences between 1045 and 4140 by doing a side by side comparison with a chart.

4041 steelproperties

The carbon content of both 1045 and 4140 determines the last two digits of their grade number. The carbon content of 1040 steel is 0.40%, while 1045 has a carbon content of 0.45%. The first digit “1” identifies that they are both carbon steels, and the second digit “0” identifies that there were no modifications to the alloy. Note the higher concentration of Manganese in 4140 than 1045.

Note that if the internal thread requirement is specified as 6H or class 2, drill the bored hole as close to the maximum minor diameter of the thread tolerance as possible. This is possible because the design of the tip diameter of UH-CT taps is as close as possible to the maximum minor diameter of the 6H internal thread and it is larger than conventional taps.

Our 1045 and 4140 grade steels are both very popular options here at Capital Steel & Wire, and we often get questions related to their differences. 1045 and 4140 have distinct chemical and mechanical characteristics which make them valuable for different applications.

Mold & die industry often deals with ultra-hard materials that require specific taps to face the resistance of steels to be cut. UH-CT carbide hand taps are designed for tapping hardened steel and extremely high hardness steel up to 60 HRC. This article gives some practical advice for getting the most from these tools.

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4041 steelequivalent

Taps specifically designed for difficult-to-machine materials such as stainless steel and heat-resistant super-alloys occupy a…

Ensure that there is no spindle run-out or misalignment between the centre of the holes and the machine spindle which may lead to chipping carbide UH-CT taps. Use a recommended tapping speed from 1 to 1.5 m/min.