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AC 43.13-1B 9/8/98 FIGURE 4-7. Self plugging friction-lock Cherry rivets. (5) Bulbed Cherrylock Rivets. One of the earlier types of mechanical-lock rivets de veloped were Bulbed Cherrylock blind rivets. These blind rivets have as their main advan tage the ability to replace a solid shank rivet size for size. (See figure 4-8.) (a) A Bulbed Cherrylock consists of three parts; a rivet shell, a puller, and a lock- ring. The puller or stem has five features which are activated during installation; a header, shank expanding section, lockring in dent, weak or stem fracture point, and a ser rated pulling stem. Carried on the pulling stem, near the manufactured head, is the stem lockring. When the rivet is pulled the action of the moving stem clamps together the sheets of metal and swells the shank to fill the drilled hole. When the stem reaches its preset limit of travel, the upper stem breaks away (just above the lockring) as the lockring snaps into the re cess on the locking stem. The rough end of the retained stem in the center on the manufac tured head must never be filed smooth, be cause it will weaken the strength of the lock- ring and the center stem could fall out. (See figure 4-8.) (b) The Bulbed Cherrylock rivets are available in two head styles: universal and 100° countersunk. Their lengths are measured in increments of 1/16 inch. It is important to select a rivet with a length related to the grip length of the metal being joined. (c) The Bulbed Cherrylock rivet can be installed using a G35 cherry rivet hand puller or a pneumatic Bulbed Cherrylock pulling tool. (6) The CherryMax (see figure 4-9) rivet uses one tool to install three standard rivet diameters and their oversize counterparts. This makes the use of CherryMax rivets very popular with many small general aviation re pair shops. CherryMax rivets are available in four nominal diameters 1/8, 5/32, 3/16, and 1/4 inch and three oversized diameters. Cher ryMax rivets are manufactured with two head styles, universal and countersunk. The Cher ryMax rivets consists of five parts; bulbed blind header, hollow rivet shell, locking (foil) collar, driving anvil, and pulling stem. The blind bulbed header takes up the extended shank and forms the bucktail on a CherryMax rivet stem. Rivet sleeves are made from 5056 aluminum, monel, and INCO 600. The stems are made from alloy steel, CRES, and INCO X-750 stem. CherryMax rivets have an ultimate shear strength ranging from 50 KSI to 75 KSI. Page 4-22 Par 4-57 (7) An rivet is a light three-piece mechanically locked, spindle-type blind rivet. It carries its stem lock integral to the manufactured head. While in stalling, the lockring is pressed into a groove on the pulling stem just as the rivet completes drawing the metal together. After installation is completed, never file the stem of an Olym- pic-Lok rivet, because it will weaken the lock- ring attachment. The Olympic-Lok fastener is available in three head styles: Olympic-Lok (see figure 4-10)PDF Image | AFS-640
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