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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. For ...
A socket cap screw, also known as a socket head capscrew, socket screw, or Allen bolt, is a type of cap screw with a cylindrical head and hexagonal drive hole. The term socket head capscrew typically refers to a type of threaded fastener whose head diameter is nominally 1.5 times that of the screw shank ( major ) diameter, with a head height ...
This definition allows ambiguity in the description of a fastener depending on the application it is actually used for, and the terms screw and bolt are widely used by different people or in different countries to apply to the same or varying fastener. In British terminology, a cap screw is a bolt that has threads all the way to the head.
Part 1 defines the mechanical properties of bolts, screws, and studs.It specifically applies to fasteners that have an ISO metric screw thread as defined in ISO 68-1.The properties are defined for M1.6-39 with coarse threads and M8-39 with fine threads.
Measuring the screw extension directly allows the clamping force to be very accurately calculated. This can be achieved using a dial test indicator, reading deflection at the fastener tail, using a strain gauge, or ultrasonic length measurement. Bolt preload can also be controlled by torquing the bolt to the point of yielding.
Another common inspection point is the straightness of a bolt or screw. This topic comes up often when there are assembly issues with predrilled holes as the first troubleshooting point is to determine if the fastener or the hole is at fault. ASME B18.2.9 "Straightness Gage and Gaging for Bolts and Screws" was developed to address this issue.
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