34 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: tdimaio@verizon.net. STRUCTURAL TYPE BLIND RIVETS Structural blind rivets have become a major type blind rivet in the market place. The two most popular structural blind rivets are the Monobolt and the Interlock. Both of these blind rivets offer high shear and tensile strength when set in an application. Their high shear and tensile values are achieved because when these rivets are set, mandrel material remains in the body of the set rivet, giving the set rivet high shear and tensile values. In both the Monobolt and Interlock the mandrel material remaining in the set rivet body is locked in the body of the set rivet. The Monobolt uses a special nosepiece that locks a skirt on the mandrel into the rivet body when the rivet is set, assuring that this remaining mandrel material in the body of the set rivet will be permanently locked in the set rivet body. The Interlock structural blind rivet has an internal lock that also locks the remaining mandrel material in the set rivet body, but does not require a special nosepiece, a standard nosepiece functions perfectly. I will discuss the Monobolt structural blind rivet in this article. The Industrial Fasteners Institute (IFI) has a blind rivet specification for structural blind rivets entitled “MULTI-GRIP FLUSH BREAK PULL MANDREL SELF – PLUGGING BLIND RIVETS” Specification No. IFI-134 Revised Feb. 2003. The Monobolt rivet has many good features to offer the user. ¤ High Shear and Tensile values when set. ¤ Positive locked mandrel material in the set rivet body. CONTRIBUTOR ARTICLE ¤ Multi-Grip feature ¤ Mandrel breaks flush at rivet body flange. The Monobolt rivet above is produced with a Dome, Countersunk and Large Flange head. Large flange head is the least popular. A 1/4 diameter Monobolt structural rivet having a steel body and a steel mandrel, has a minimum shear value of 2400lbs. and a minimum tensile value of 1850lbs. Both the shear and tensile values are minimum values. This means that a steel/steel 1/4 diameter Monobolt blind rivet can withstand forces of 2400lbs in shear and 1850lbs in tensile before any movement or signs of failure will appear to the Monobolt rivet. These high values are achieved because the set Monobolt has mandrel material in the shear plane of the set rivet, giving the rivet this high shear and tensile strength. The positive locked mandrel in the set rivet and the large mandrel head engagement in the set rivet body, gives the set rivet the high shear and tensile values. The Monobolt and Interlock having these high shear and tensile values has made these structural blind rivets a good choose of fastener for applications where high shear and tensile forces exist. Both having a locked portion of the mandrel in the set rivet body, ensures the user that the shear and tensile values of the set rivet are permanently in the set rivet. CONTINUED ON PAGE 116
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