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Distributor's Link Magazine Winter 2023 / Vol 46 No 1


60 THE DISTRIBUTOR’S LINK Anthony Di Maio Anthony E. Di Maio attended Wentworth Institute and Northeastern University. In 1962 he started working with Blind Fasteners as Vice-President of Engineering & Manufacturing for two blind rivet manufacturers. He has been Chairman of the Technical Committee of the Industrial Fasteners Institute (IFI) and is still involved in the writing of IFI specifications. In 1991, he started ADM Engineering and is working with Fastener Manufacturers developing new fasteners and special machinery. He can be reached at ADM Engineering, 6 Hermon Ave., Haverhill, MA 01832; phone and fax 978-521-0277; e-mail: BLIND RIVETS ARE A UNIVERSAL FASTENER Market potential comparison with other fastening methods and key applicational/cost factors and the following different philosophies I have heard about blind rivets. Blind rivets are unique fasteners with consistent tensile and shear values. The operator need only break the mandrel to complete the assembly. Because operators have no (direct) control over the tightened result, blind rivets are operator error proof. Generally, a blind rivet is a mechanical device which can join component parts in an assembly when access for fastener installation and activation is available from only one side. Specifically, a blind rivet is a blind fastener having a self- contained mechanical feature which permits formation of an upset on the blind end shank during blind rivet setting to join component parts of an assembly. We define a blind rivet as a two or more piece fastener in which installation is from one side of whatever is being joined together. Installation may be accomplished by a mechanical operated tool, or in some special cases through an impact where a pin is driven into the blind rivet shell, causing an upset, or formation on the blind side (Drive Pin Blind Rivets). Some blind rivets styles involve lock spindles and other special features which go beyond the two-piece CONTRIBUTOR ARTICLE configuration. A significant distinction should be made at this point that the term “blind” associated with these fasteners is not an application limitation that they can only be used in blind applications. Really it is an enhancement of the product to be used in that fashion. Today, there are many applications where blind-side fastening is not the primary requirement. Rather, these fasteners are selected because they represent a well-controlled light weight, inexpensive low- installed cost system. A major issue today is the philosophy of installation cost as opposed to initial fastener purchase price. Blind rivets are sold as a system along with an installation tool. Considering all the facets: versatility to match application design parameters: utilization of low skilled labor: control of warranty and quality rejects, we demonstrate an efficient, reliable lowest-installation cost alternative. One of the positive features of blind rivets is the well controlled quality at the manufacturing level to assure the customer of the reliability at the point of end use. The foundation for this materialized with standard developed with emphasis on raw material quality. Testing standards include procedures for testing blind rivets for shear and tensile values. All producers now use essentially the same fixturing devices. CONTINUED ON PAGE 120



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