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AC 43.13-1B 9/8/98 FIGURE 4-3. Methods of determining setback for bends other than 90 degree. (4) Countersunk head rivets (MS20426 supersedes AN426 100-degree) are used where a smooth finish is desired. The 100-degree countersunk head has been adopted as the standard in the United States. The universal head rivet (AN470 superseded by MS20470) has been adopted as the standard for protrud ing-head rivets, and may be used as a replace ment for the roundhead, flathead, and brazier head rivet. These rivets can also be purchased in half sizes by designating a “0.5” after the main length (i.e., MS20470 AD4-3.5). FIGURE 4-4. Rivet identification and part number breakdown. b. Replace rivets with those of the same size and strength whenever possible. If the rivet hole becomes enlarged, deformed, or oth erwise damaged; drill or ream the hole for the next larger size rivet. However, make sure that the edge distance and spacing is not less than minimums listed in the next paragraph. Rivets may not be replaced by a type having lower strength properties, unless the lower strength is adequately compensated by an increase in size or a greater number of rivets. It is acceptable to replace 2017 rivets of 3/16 inch diameter or less, and 2024 rivets of 5/32 inch diameter or less with 2117 rivets for general repairs, pro vided the replacement rivets are 1/32 inch greater in diameter than the rivets they replace. Page 4-16 Par 4-57PDF Image | AFS-640
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