Dowel pins12/21/2023 ![]() Locating pins, cotter pins, and spring pins have their own unique Engineering360 selection guide and specification filter. There is a limited number of dowel pin types. If the pin has two separate tolerances on each end, it is considered a 'parallel pin'. This tolerance ensures that the dowel mates in either a loose-fit or press-fit fashion with its corresponding hole. 010 inches compared to the dowel pin's nominal size. A dowel may have diameter tolerances of ±. Most dowels produced are of the straight dowel variety. Length is the measurement of the dowel's longest cross section.Outer diameter is the measurement across the edges that form the dowel pin's width.Dowel Pin SizingĪfter material, dowel pin sizing is the other major specification manufacturers need to consider. Plastic dowels are formed via plastic injection molding. Titanium is strong, with good temperature and corrosion resistance.Unhardened steel is more malleable, but is still suitable for many applications. It has gone through a hardening process such as quenching or induction. ![]() Steel that is hardened and ground is compacted to produce a very hard, though brittle, metal.Stainless steel has a high pressure rating, and is chemical and corrosion resistant.Brass is strong, ductile, conductive, corrosion resistant, and demonstrates low magnetic permeability.Aluminum, which is light, ductile, conductive, and very resistance to oxidation.Metal dowel pins undergo a melt and cast process, as indicated by the infographic below:Ĭommon metal materials for dowel pin manufacture include: Video credit: Montana Hydraulics / CC BY-SA 4.0 Dowel pins may undergo a secondary operation, such as planing or grooving, if desired. These dowel pins are usually of hard wood, like birch or maple. Dowel pins are shortened lengths of full-sized dowels. Wooden dowel rods are produced on the same mill machinery that produces other finished cylindrical wood products, like fence poles and furniture pieces. They can also be applied as hinges and simple axles. For this reason, dowels are commonly used in furniture. Dowel pins typically have working loads identified, with a breaking strength measured as when a double shear occurs.įor aesthetic applications where the hardware must be accessible or seen, a dowel pin can appear uniform to its assembly-a distinct advantage over other fasteners. For a firm fit, the hole should be exactly the same size or slightly smaller than the dowel's diameter. They must be rigid while in use so they are capable of keeping the assembled parts aligned without further hardware fastening. Dowel pins' mechanical capabilities stem from their high coefficient of friction, and any adhesive that may be applied when they are inserted into press-fit predrilled holes. Dowel Pin Operationĭowel pins do not possess moving or actuated components. They are commonly available in imperial or metric units. Dowel pins can be tapered, slotted, grooved, or otherwise altered to change its mechanical properties. They are short, cylindrical rods made of various materials including wood, metal and plastic. Dowel pins are industrial fasteners that are used to join two or more items together.
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