Simpson Crimp Drive Anchors

Simpson Strong-Tie Crimp Drive Anchors: Professional Guide

Simpson Strong-Tie Crimp Drive anchors are mechanical fasteners designed for concrete and masonry applications where high pull-out strength and consistent performance are critical. These anchors feature a crimped sleeve design that expands when the bolt is tightened, creating a secure mechanical connection in the base material.

Common Applications

These anchors work well for structural connections including beam attachments, column bases, equipment mounting, and seismic retrofits. They're frequently specified for heavy-duty applications where consistent holding values are required across varying concrete conditions. The anchors perform reliably in both normal-weight and lightweight concrete.

Load Ratings and Specifications

Load capacities vary based on anchor diameter, embedment depth, concrete strength, and edge distances. Typical diameters range from 1/2 inch to 1-1/4 inch, with embedment depths from 2-1/4 inches to 9 inches, depending on the specific model. Published load tables account for tension, shear, and combined loading conditions.

The anchors are tested and qualified under ICC-ES evaluation reports, which provide allowable loads for various installation conditions. These reports also specify minimum concrete compressive strength requirements, typically 2,500 psi for standard applications.

Advantages in Field Conditions

The crimp drive design offers several practical benefits for contractors. The pre-crimped sleeve prevents over-expansion that can occur with some wedge-type anchors, making installation more forgiving. The system also works well in situations where access is limited since it doesn't require setting tools beyond standard wrenches.

Performance remains consistent across different concrete ages and strengths within the specified range. The mechanical expansion doesn't rely on chemical curing, so installations can be loaded immediately after proper installation and torquing.

Sizing and Selection

Proper anchor selection requires matching the required load capacity with the appropriate anchor size and embedment depth. Factor in safety margins per applicable building codes - typically 4:1 for static loads. Consider the fixture thickness when determining bolt length requirements, as the bolt must advance sufficiently to engage the expansion mechanism.

Environmental conditions may influence material selection. Stainless steel versions are available for corrosive environments, while standard carbon steel with zinc plating handles most interior applications.