SUMMER 2018

156 THE DISTRIBUTOR’S

156 THE DISTRIBUTOR’S LINK ANTHONY Di MAIO USING THE CORRECT SIZE BLIND RIVET from page 76 Using the correct length closed-end blind rivet the upset side will look like this: UPSET SIDE FIGURE 4 - PROPERLY SET RIVET When the blind rivet is too short: FIGURE 5 - BARREL LENGTH TOO SHORT When the blind rivet length is too long: LONG UPSET FIGURE 6 Hole diameter is also very important. I receive calls telling me that the mandrel head is setting deep in the rivet body. This is caused by the diameter of the hole in the work piece is too large. But users tells me that they need to have oversize holes in order to line up the holes in the two work pieces that they are riveting together. If it is necessary to have oversize holes for the hole line up, they should make the hole larger in the work piece that is on the flange side of the blind rivet and the correct diameter hole size on the upset side of the blind rivet. Having the correct hole size on the upset side, the mandrel head will be in the correct position after setting the blind rivet. In this application a large flange blind rivet should be used. The large flange of the blind rivet will cover the oversized hole and will give the user a tight riveted joint. If it is necessary to have an elongated hole in the work piece to line -up the rivet upset hole in the work piece, a large flange blind rivet will cover the elongated hole and will again give the user a tight riveted joint. The blind rivet is a mechanical device that can join component parts in an assembly where access for the 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 side of the work pieces. The expansion of the blind rivet body during rivet setting joins work pieces to form an assembly. This expansion is created by the head of the mandrel being pulled into the blind rivet body by the rivet setting tool. The mandrel has a break point just below the mandrel head. This is where the mandrel will break when the setting tool is pulling the mandrel with a force greater than the tensile strength of the mandrel break point. When the mandrel breaks at the break point, the blind rivet is properly set and gives the riveted point the tensile and shear values listed in the (IFI) Industrial Fasters Institute specification No. 114 or the tensile and shear values that the blind rivet manufacturer lists in their catalog. The setting speed of the blind rivet has been the major user consideration for using blind rivets. A blind rivet properly used, regarding rivet length, diameter of the blind rivet holes and thickness of the work., it is the quickest way to fasten together an assembly. I have been asked many times “The blind rivet setting tool is cutting the mandrel too soon and the blind rivet is not set. The blind rivet setting tool is not cutting the mandrel. The mandrel breaks at the breaking point, but the tensile strength of the mandrel breaking point is too low. The user should contact the blind rivet manufacturer informing them of the condition. The setting speed of a blind rivet is fast and effective and has been the major user consideration for using blind rivets. When using the correct size blind rivet, regarding length, diameter of the rivet holes and proper work thickness, you are using the fastest method to fasten an assembly together. ANTHONY Di MAIO

FASTENER FAIR USA CLEVELAND, OH - APRIL 11-12, 2018