Crowfoot Wrench Torque Conversion Chart & Torque Wrench Offset Formulas

This document is a reference chart for re-calculated torque values when using crowfoot wrench adapters in-line with micrometer "click type" torque wrenches. It notes the values are valid only when using GAC accepted and approved tools. Four tables cover Open End Crowfoot (Lengthening and Shortening) and Flare Nut Crowfoot (Lengthening and Shortening) configurations. Each table lists wrench sizes from 3/8" up to 1 1/2" (open end) or 1" (flare nut), the required fastener torque ranges in inch-pounds for aluminum and steel, and the corrected torque wrench settings to dial in. A footnote indicates the 1-1/2" steel values marked with an asterisk use a 1/2" square drive, while all other tools are 3/8" square drive. The right margin provides the correction formulas: for a lengthening configuration, Torque Setting = (Required Fastener Torque / (A + B)) x A; for a shortening configuration, Torque Setting = (Required Fastener Torque / (A - B)) x A. Diagrams at the bottom define Dimension "A" (length of the torque wrench from drive to handle pivot) and Dimension "B" (offset of the crowfoot adapter in the lengthen or shorten orientation). This is a general shop tool reference, not vehicle-specific.