Knurl Pins

Knurled pins are similar to grooved pins in that the diameter of the pin is expanded by pressing features into the body of the pin. Compression of the expanded portion of the pin in a straight drilled or molded hole results in a holding force that locks the pin in place. Rather than three grooves, the knurl pin has a series of ridges or teeth around the nominal diameter. The teeth may form a straight knurl, helical knurl or diamond knurl pattern.

A wide variety of pin sizes and knurl configurations is possible. Consequently, most knurl pins are manufactured to customer specifications. Knurl pins are commonly specified by length, nominal diameter, expanded diameter, knurl pattern (straight, helical, diamond), the number of teeth per inch (tpi) around the diameter, material and finish.

Knurl pins are best suited for use in softer materials such as aluminum castings, plastics and in applications such as fabricated sheet metal, where holding in thin cross sections is desirable.

Commercial straight pins are available in the same range of sizes and material as knurl pins. Pin ends are chamfered for diameters greater than 1/16 inch.

Grooved Drive Studs

Grooved Drive Studs Offset Ribbed Drive Studs

The grooved Drive Stud incorporates the same locking principle applied to the Groov-Pins. It has three parallel grooves extending over the length of the shank and a short pilot to aid insertion. Drive Studs replace bolts, screws and rivets wherever a headed fastener is required.

Drive Studs are used to fasten cover plates, name plates, decorative elements, to clamp conduit or pipe, and as electrical contacts. They can be applied more rapidly than threaded fasteners and require only a simple drilled hole for insertion.

The standard Drive Stud is furnished with a round head and is made of cold drawn low carbon steel and is zinc plated. Special Studs can be manufactured with alternate head shapes, finishes, and from materials such as stainless steel, alloy steel, brass or monel.

This hardened stud has been designed for application in any material subject to plastic deformation, such as cold and hot rolled steel, zinc die castings, aluminum or magnesium sand, or die castings, and is particularly recommended for secure fastening where extreme vibration is encountered. The two sets of longitudinal ribs are offset one from the other by one-half pitch. The lower set of ribs, first during insertion, forces the hole wall material into the valleys between the ribs. The flow of displaced material is then deflected to follow the offset path when the upper ribbed section engages and the stud is securely locked into the work material. The material is steel, case hardened and plated.

Click here to view Drive Stud Dimensions and Weights table

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