. Electric railway journal . portion of a finishedl)olt, on a blank bolt, or on a test piece■of the same size and same grade ofsteel. In any case the specimen testedmust be subjected to the same treat-ment as the finished bolt. It is notnecessary that the bolt bend double inthe threaded portion. The iron shall conform to the fol-lowing requirements: AA Ultimate strength, not lessthan 50,000 lb. per square inch. BB Elastic limit, not less than 50per cent of the ultimate strength. CC Elongation, not less than 18per cent in 2 in., with the fracturewholly fibrous. DD Reduction of area, not lesstha
. Electric railway journal . portion of a finishedl)olt, on a blank bolt, or on a test piece■of the same size and same grade ofsteel. In any case the specimen testedmust be subjected to the same treat-ment as the finished bolt. It is notnecessary that the bolt bend double inthe threaded portion. The iron shall conform to the fol-lowing requirements: AA Ultimate strength, not lessthan 50,000 lb. per square inch. BB Elastic limit, not less than 50per cent of the ultimate strength. CC Elongation, not less than 18per cent in 2 in., with the fracturewholly fibrous. DD Reduction of area, not lessthan 25 per cent. EE The elastic limit, elongationand reduction of area may be de-termined on a test piece i in. by 2 from a finished bolt. FF The ductility of the bolts shallbe determined by the cold bend test,which requires that the material usedin the bolts shall bend cold through180 deg. with a radius of not morethan i in. without fracture on theoutside of the bent portion. Whennicked specimens are bent cold the. y^--i-i/.,I 19 Threads per Inch STANDARD TRACK BOLT fracture must be wholly fibrous. Thebends may be made on the unthreadedportion of a finished bolt, on a blankbolt, or on a test piece of the samegrade of iron. In any case the speci-men tested must be subjected to thesame treatment as the finished is not necessary that the bolt benddouble in the threaded portion. In either case, a sufficient numberof tests shall be made to satisfy therailway companys inspector that thematerial meets the specifications inevery respect, and he shall have theprivilege of selecting the specimens tobe tested. 3. Workmanship and Finish: The form and dimensions of boththe steel and iron bolts shall conformto the drawings submitted by the rail-way company and forming a part ofthese specifications, subject to the fol-lowing permissible variations: (a) The length shall not be morethan tV in. less nor more thani in. greater than that shownon the drawing.(6) The d
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