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When designing mechanical assemblies, it’s likely that they’ll require fasteners for assembly. Fasteners like screws and bolts are commonly used to secure mating components, and they usually require some type of hole for assembly. There are many types of holes to use to install fasteners such as countersunk, counterbore, tapped, tapered, spot faced, and screw clearance.

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For all your custom CNC part manufacturing needs, Fictiv has you covered. We’re experts at machining any size of tapped holes in a variety of materials, and we simplify custom part sourcing with intelligent, streamlined, automated workflows. Fictiv is your operating system for custom manufacturing that makes part procurement faster, easier, and more efficient.

Feed rate is defined as the distance the tool travels during one revolution of the part. Depth of cut is the distance that the tool bit moves into the work, ...

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The next largest drill size beyond the calculated diameter should be chosen to tap the hole. So, if you calculate a drill diameter of 0.720”, you choose the next largest tap diameter of 0.750”.

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Threaded fasteners have been around for decades and provide a novel method of force transformation to secure two or more components together in an assembly. Screws, in particular, have been the subject of many mathematical and geometric studies in the past because they act as simple machines that transfer rotational forces, or torque, into a simple linear force. One way to understand this is using the concept of the Archimedes screw — where a rising level of water turns a turbine connected to an electrical generator to generate power from a water source (the Archimedes screw acts as a power displacement pump). Pro-Tip: If you’re tasked with designing a threaded fastener from scratch, advocate for an off-the-shelf solution instead. Otherwise, use threading calculations and fastener calculations to help with your design.

We exist to eliminate bottlenecks in new product development by integrating the people, processes, and platform you need to source custom parts.

After the hole is drilled, you form the threads on the inside diameter of the hole using a tap. Taps look similar to drill bits, and there are a few different types of taps: hand taps, power taps, tapered taps, extension taps, and exotic taps. All taps are marked with a standard designation that includes the following information:

Tapping is the process of creating threads inside of a hole for the installation of a screw or bolt — so a tapped hole is just a hole that is internally threaded. The tapping process starts with drilling a hole that is typically slightly smaller in diameter than the major diameter of the threaded fastener you will use. Here’s the equation for determining the size of the tap to use for ANSI threads:

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The nominal size is the thread concentration, while the thread form designation identifies the thread family the threads belong to (i.e. ACME, UNC, UNF, UNJ, UNS). The material tap is constructed from is typically a tough material like carbide, and the pitch diameter tolerance gives an alpha-numerical code that designates the tolerance for the thread.

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While tapping is the process of creating internal threads within a hole, threading is the process of creating external threads on the cylindrical body of a screw, bolt or other part to be assembled (like pipes). When referring to an installation location for a threaded fastener, you may use the term threaded hole or tapped hole but remember that a fastener is threaded, not tapped.

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May 13, 2024 — It supports all of the following machine tool operations: Drilling; Reaming; Milling (face, slab, and end milling); Boring; Counterboring ...

Making the switch to aluminum for lightweight, high-performing automotive applications? Only RobbJack's A1-303 met this machining requirement where over 20 other toolmakers failed. See the case study that proves it.

Now, let’s look at the definition of tapping vs threading, decode the proper use of the terms, and find out which is the correct terminology: threaded holes vs tapped holes.

Threading on a screw or bolt begins at the point of engagement of the fastener and continues through the body to the shank, or unthreaded portion, of the fastener. See the image at the beginning of this article for a more detailed refresher on threaded fastener terminology.

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