http://www.cablebolts.info Bolting System for Mining, Tunneling and Construction Industries. Tue, 06 May 2008 10:23:14 +0000 http://backend.userland.com/rss092 en Cable bolts Cable bolts are designed to be used in ground and rock reinforcement near mining excavations and in particular near workings in weak strata with lower strength or entering mining pressure zones. Cable bolts are made from cable of fi-15,5 mm and 1+6 structure in accordance with PN-71/M-80236. The following types ... http://www.cablebolts.info/?p=8 Fasteners * A cap screw, as used in a bolted joint * Bolt (climbing), an anchor point used in rock climbing * Deadbolt, a kind of locking mechanism * Screw, a cylindrical threaded fastener * Several fasteners used in boat building http://www.cablebolts.info/?p=7 Bolted joints Bolted joints are one of the most common elements in construction and machine design. They consist of cap screws or studs that capture and join other parts, and are secured with the mating of screw threads. There are two main types of bolted joint designs. In one method the bolt ... http://www.cablebolts.info/?p=6 Thread strength Nut threads are designed to support the rated clamp load of their respective bolts. If tapped threads are used instead of a nut, then their strength needs to be calculated. Steel hardware into tapped steel threads require a depth of 1.5× thread diameter to support the full clamp load. If ... http://www.cablebolts.info/?p=5 Setting the torque Engineered joints require the torque to be accurately set. The clamp load produced during tightening is about 75% of the fastener's proof load. Over tightening will damage threads and stretch the bolt, ruining the joint's strength; see Hooke's law. If the hardware is Cadmium plated, or lubricated (or both) ... http://www.cablebolts.info/?p=4 Property class There are many different property classes (grades) of bolts and nuts. The most common are listed below. Note that each nut property class listed can support the bolt proof strength load of the bolt it is listed beside without stripping. The first number in the bolt property class indicates ... http://www.cablebolts.info/?p=3 Failure modes The most common mode of failure is overloading. Operating forces of the application produce loads that exceed the clamp load and the joint works itself loose, or fails catastrophically. Something that is not considered structural failure, but nevertheless is becoming a modern annoyance in new buildings is bolt banging. Over ... http://www.cablebolts.info/?p=1