How Red Head Sleeve Bolts Work
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Red Head Sleeve Anchors
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Sleeve anchors are used in applications where the material that is being bonded to cannot be threaded and a nut cannot be placed on the end of the bolt. A hole is drilled a specific diameter depending on the diameter of the bolt. The bolt is placed in the hole and a wrench is used to tighten the bolt. As the bolt is tightened, a cone-shaped expansion plug on the end of the bolt is pulled into the sleeve, causing it to expand and press against the walls of the hole. As the sleeve crumples and expands to fill the hole, friction holds the bolt inside the hole.
Types
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Sleeve anchor bolts work on several different principles. Expansion types use an anchor that expands into the hole, transferring tension loads to the base material. Examples of these types of bolts are Red Head Trubolts, Dynabolts, Multi-set II Anchors and Hammer-Sets.
Bolts can also be fastened to concrete or other materials using an adhesive in the drilled hole that grabs the threads. Keying-type bolts use an expanding anchor that provides back-pressure on a bolt that is drilled into a hollow base material.
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Applications
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Sleeve bolts are used for various applications where a nut can't be threaded onto the end of the bolt. Red head sleeve bolts are designed for applications including electrical and mechanical contracting, drywall and carpentry applications, steel erector and curtain wall applications, highway and bridge construction and specialty applications.
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