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A stud is graded for vertical application and its stress requirements and allowable visual defects reflect that application. A stud is most similar to a #2 grade, which is held to a higher standard during grading. The biggest difference between the two is the frequency, placement and size of knots and overall allowable wane.
ISO 898 is an international standard that defines mechanical and physical properties for metric fasteners. This standard is the origin for other standards that define properties for similar metric fasteners, such as SAE J1199 and ASTM F568M. [1] It is divided into five (nonconsecutive) parts: 1.
Tap-end studs have threads at extreme ends of the body with unequal thread engagement length, while double-end stud bolts have equal thread length at both ends. Apart from these, there are stud bolts for flanges , which are fully threaded studs with chamfered ends, and double-end studs with reduced shank for special bolting applications.
The standard designation for a UTS thread is a number indicating the nominal (major) diameter of the thread, followed by the pitch measured in threads per inch.For diameters smaller than 1 / 4 inch, the diameter is indicated by an integer number defined in the standard; for all other diameters, the inch figure is given.
The thread depth is 0.54125 × pitch. The outermost 1 ⁄ 8 and the innermost 1 ⁄ 4 of the height H of the V-shape are cut off from the profile. The relationship between the height H and the pitch P is found using the following equation where θ is half the included angle of the thread, in this case 30°: [3]
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Studs with a length of engagement equal to about 1 d: Active: DIN 939: Studs with a length of engagement equal to about 1,25 d: Active: DIN 946: Determination of coefficient of friction of bolt/nut assemblies under specified conditions: Withdrawn: DIN EN ISO 16047: ISO 16047: DIN 960: M8x1 to M100x4 hexagon head bolts with fine pitch thread ...
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