Maxi-Bolt
The Maxi-Bolt Undercut Anchor System
Developed in 1980, the Maxi-Bolt was the first practical undercut anchor. Since that time the Maxi-Bolt has been used in thousands of demanding applications - applications in which a typical sleeve or wedge anchor would have been out of the question. Because of its unique undercut design, the Maxi-Bolt anchor is the functional equivalent of a cast-in-place anchor. Unlike grouted and epoxy anchors, the Maxi-Bolt retains its holding capacity even in cracked concrete. If you have an application involving high design strength requirements, dynamic loading or the possibility of a cracked concrete environment, the Drillco Maxi-Bolt Undercut Anchor is the bolt for you.
In many applications, oil-soaked concrete prevents the use of grouted or epoxy anchors. The Maxi-Bolt works well in these environments because it derives it holding power from mechanical interlock - not chemical bonding.
Engineering
Application Tip: In many cases the concrete in industrial plants has become soaked with oil. Adhesive and grouted anchors will not bond properly to this concrete. Maxi-Bolts, on the other hand, work fine in these situations.
Legal Disclaimer: The design information presented here applies only to Drillco Maxi-Bolts. Because dimensional characteristics particular to the Maxi-Bolt are hard-wired into the design calculations, Drillco can make no representation as to their validity when applied to other undercut or cast-in place anchors.
Quick Reference Load, Spacing and Torque Tables from ICC ESR 3029
Building Code & Engineering Approvals
Tension and Shear Load Allowables and Embedment and Spacing Tables for all available materials.
An Undercut hole is the secret of the Maxi-Bolt's superior performance.
Features and advantages of the Maxi-Bolt
The Maxi-Bolt is manufactured under a rigorous quality assurance program.
General Design Considerations.
ICC ESR 3029
Calculating Projected Concrete Area to Determine Concrete Pullout Capacity.
Appendix B of ACI 349, "Steel Embedments"
Test Data and Reports
Materials
Installation
Maxi-Bolt installation videos.
Animated installation sequence.
Maxi-Bolt installation outline.
Detailed Maxi-Bolt installation procedure.
Detailed Maxi-Bolt installation procedure. (Printable version in PDF Format)
Stud-Type Anchor Installation. (Slide Show Format)
Flush-Type Anchor Installation. (Slide Show Format)