Where a flush surface is required, the countersunk head style should be selected. However, when soft or brittle materials are fastened to a rigid backing member, the large flange head should be considered because it offers twice the bearing surface. The low-profile domed head is appropriate for most applications. The rivets length should equal the thickness of the fastened objects. This led to an increase in the initial stress on the rivet, causing it to fracture. A size 68 rivet has a 6/32-inch body diameter and an 8/16-inch grip length. As a rule, the rivet materials should have the same physical and mechanical properties as the materials to be fastened, because a marked dissimilarity may cause joint failure due either to material fatigue or galvanic corrosion. A deviation in the alignment of the mounting hole between the frame and skin connected by the rivet resulted in an imbalance between normal bending and shear stress, compounded by the added stress from air flow vibrations. Nature of materialsīoth the rivet and the materials to be fastened will affect the ultimate joint strength. Remember that insufficient rivet length will not allow proper formation of the secondary head at the back of the work. You must select a rivet with a grip range that includes the work thickness required. This determines the required "grip" of the rivet you select. Measure the total thickness of the materials to be joined. Which rule about finger to determine who drill bit size for a particular die is to allow up to sechstes thousandths of somebody per further in diameters so that rivet can slide into the. For a 3/16 rivet, you wants need a hole bit that is moreover a 10 (0.194) or 11 (0.191). POP ® brand rivets are not certified for structural aerospace applications and such use is not recommended. It also gives the drill bit sizes for other standard rivet diameters. Then refer to the "Shear" and "Tensile" in the Rivet Selection Guide on the product and select a POP ® brand rivet that provides the values required. These are functions of total joint strength, fastener spacing, rivet body material, and rivet diameter. Joint strengthįirst determine the single-joint tensile and shear values required for the application. The load applied to a fastener along its length. The load applied to a fastener along the joint interface. The recommended thickness range over which the body length will consistently provide a proper setting in a hole of the specified diameter. (Best practice is to follow the hole size recommendations provided).Īvoid burrs in and around the holes. It may also cause bulging or separation of the members by allowing the rivet to expand between them instead of only on the blind side. Too large a hole will reduce the shear and tensile strengths. In this article, follow us to understand the rivet sizes and dimension details, including how to express and determine it, as well as the standard rivet hole size chart for reference. Too small a hole will, of course, make rivet insertion difficult. In order to assemble the parts correctly, hole preparation is critical. Hole size can be important in blind riveting. This illustration provides a graphic representation of the POP ® blind rivet selection factors described below.
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