7 years ago

FALL 2014

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Distributor's Link Magazine Fall Issue 2014


76 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: THE STRENGTH VALUES OF BLIND RIVETS Blind rivets have a wide range of tensile and shear values, head configuration, alloys and various designs that will solve your application problems. The Industrial Fasteners Institute (IFI) has the best blind rivet specifications. POINT STYLE OPTIONAL Tensile and Shear Values Blind rivets offer a wide range of tensile and shear values of set blind rivets that will satisfy the requirements of fastening applications. Using IFI specification IFI-114 The IFI specifications are revised by the technical committee of the IFI. The technical committee is made up of the technical personal from all of the USA blind rivet manufacturers who are members of the IFI. I have the pleasure of being evolved with this technical committee. Tensile The tensile ranges per IFI-114 specification “Break Mandrel Blind Rivets” start at 80 lbs. for a 3/32 diameter blind rivets Grades 10, 11, 12 aluminum rivet body, to 2100 lbs for 1/4 diameter Grades 50,51 stainless steel body. An Engineer has a wide range of tensile values to choose from when designing a blind rivet application. Shear The shear ranges per IFI-114 start at 70 lbs for the 3/32 diameter blind rivet Grades 10, 11, 18 aluminum rivet bodies and up to 1700 lbs for 1/4 diameter stainless steel rivet body. I have found that the USA and overseas blind rivet manufacturers have a good understanding of the IFI specifications. I have had both USA and overseas blind rivet manufactures ask me about the “L” dimensions. The question has been directed to two different lots of the same blind rivet they received and “L” dimensions are different in both lots. Let us look at size 64 blind rivet. This blind rivet is a 3/16 diameter blind rivet with a maximum grip range of .250. The industry standard for the barrel length “L” for the 64 blind rivet is .407 +/-.010. The “L” dimension in the IFI-114 specification for a 64 is .450 max. Therefore the difference between the industry standard dimension of .407 to the maximum “L” dimension of IFI-114 which is .450 maximum is .043. If you use the minimum industry standard dimension which is .407 (-).010 = .397. The variation now is .450 (-) .397 = .053. Blind rivet bodies of a 64 blind rivet can vary from .397 to .450 and still be within IFI-114 specification. Another point that tells me that IFI has the most detailed specifications, is that IFI-114 specification lists the minimum and maximum mandrel break loads for all mandrels, all alloys and for all blind rivets. ISO only states maximum mandrel break loads. I strongly believe that this is a serous omission of critical information for blind rivet users. The break load or tensile strength of the mandrel is the setting force that sets the blind rivet body and fastens the work pieces. please turn to page 212



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