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Blind Broaching

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Unlike other broaching operations, blind hole broaching does not allow the tool to pass completely through the metal part. Instead, it produces an indent or slot in the metal. Every aspect of this type of broaching, especially the tooling design and execution, are very difficult and are only done by skilled, experienced broachers. Read More…

Blind Broaching Blind broaching is a method of broaching that involves making indents and shapes in metal workpieces without reaching the other side of the material. It is considered a surface broaching process, where materials are removed from the external surface of a work-piece.
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Leading Manufacturers

Warren, MI  |  586-757-5131

Diamond Broaching Service LLC showcases its value to its customers and the industry through quality customer service. The new team of Engineers and Machinists continue to provide the same high quality broaching services that our customers have depended on for over 70 years. With over 400 Broaching Tools in our inventory, we can respond quickly to provide the following shapes in just about all components. Call today!

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Diamond Broaching Services, LLC $$$

Kenosha, WI  |  262-764-3503

Toolamation, Inc. specializes in complete high-volume production broaching services. We have the capacity to produce many millions of parts annually. On-site tumbling, deburring, & sharp edge removal services. Fast turn-around. We also offer a range of screw machine tooling products.

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Toolamation, Inc. $$$

Capac, MI  |  810-395-8810

ISO-Certified, we’re known for superior quality, competitive pricing, & fast delivery. We specialize in low and high volume broaching of small and large parts out of almost any material. We design, engineer, & manufacture custom broach tools to meet your precision requirements. Contact us today for cost-saving tool maintenance programs such as reconditioning and re-sharpening of your broach tools.

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Miller Broach, Inc. $$$

East China, MI  |  810-765-5755

With over 40 years of broach building experience, we have become specialized in manufacturing and engineering of broach tools in many shapes and sizes. Our manufacturing department has complete in house broach building capability. We provide broach manufacturing and reconditioning.

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Alliance Broach & Tool, Inc. $$$

Warren, MI  |  586-779-2243

With over 70 years of broach building experience, we have become the number one broaching source for leading industrial organizations in Southeast Michigan, Ohio, and Indiana. Our manufacturing department has complete in-house broach building capability. We take pride in our reputation for speed, quality, and competitive pricing. Contact Sturdy Broaching today to learn more!

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Sturdy Broaching Service $$$
placeholder image Diamond Broaching Services, LLC Toolamation, Inc. Miller Broach, Inc. Alliance Broach & Tool, Inc. Sturdy Broaching Service

Although broaching styles that pierce from one side to the other, such as internal broaching require careful machining as well, it is not quite as difficult as a set-up that must only go part way through a surface.

Blind broaching is reserved for cutting slots, holes and imprints that are round, square, hexagonal or splines in hardware and parts for the aerospace and construction industries. A common example of a blind hole broached product is the internal hexagon on headless setscrews.

Applications for a broached blind hole are rare, but it is the only process able to produce holes with the necessary shapes and dimensions for some metal parts. It's also an economical and efficient means of internal spline production. Broaching blind holes is cost effective, highly repeatable and produces no variance among the products.

The blind holes produced by broaching machinery have a good surface finish when the part's material is hardened, smooth edges without burrs or cracks. The broaching machine is either hydraulically or electromechanically driven and, depending on the volume of work-pieces, is manually or automatically loaded and unloaded.

Blind broaching is either straight, meaning the tool containing the teeth is long and thin and moves linearly, or helical, which means the tool is rounded and moves in a circular motion; helical broaching is the most common. It uses a series of circular indexing tables that rotate under or over the work-piece.

The machinery pushes the work-piece up over the tool, where a shape punches down, withdraws and then turns to the next shape, which is bigger than the last. The next tool is positioned over the small punch, and is made bigger.

Some broaching machinery has dozens of successively larger tools that slowly create a larger blind hole. Each tool must be withdrawn backward over the broached surface, unlike most other broaching processes, which cut straight through the work-piece.

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