CCFSS Library (1939 - present)


R. W. Eastman


Ultimate load data is presented from more than 1600 tests on sample connections made with different thicknesses of zinc-coated sheet steel and a variety of commonly used thread forming and self-drilling fasteners. The three fundamental loading conditions examined were pull-over, pull-out and single lap shear.

Empirical relationships have been developed which allow interpolation of the data within the range of sheet steel thicknesses tested.

Type AB and type A thread forming fasteners, and a number of different self-drilling fasteners were tested, in sizes from #14 (.250 in.) to #8 (.164 in.) diameter. Flat metal washers and a variety of sealing washers were also used in combination with the different fastener types and head styles.

The thicknesses of steel sheets ranged from .022 in. to .060 in. depending on the particular loading condition being tested. The sheet material was ductile and of medium strength and hardness.

All fastener connections tested under all loading conditions achieved higher failure loads with thicker steel sheets.

The #14 (.250 in.) diameter fasteners of each type gave significantly higher connection failure loads in most sheet thicknesses than the other fastener sizes. Connections with #12 (.216 in.), #10 (.190 in.) and #8 (.164 in.) diameter fasteners showed only marginal differences in ultimate load.


Civil, Architectural and Environmental Engineering


Canadian Steel Industries Construction Council (CSICC)
Dominion Foundries & Steel Limited (DOFASCO)

Research Center/Lab(s)

Wei-Wen Yu Center for Cold-Formed Steel Structures


Canadian Steel Industries Construction Council

Publication Date

01 Jan 1976

Document Version

Final Version

Document Type

Technical Report

File Type