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Arrow Home Home    Products    Weather Gard®    Structural Performance
Structural Performance
Fastener and steel gauge sizes used throughout this Weather Gard section are nominal.

Fastener Sizes
Fastener Size #10 #12 #14
Thread Diamater Decimal Equivalent .190 .216 .250


Steel Gauge Sizes*
Gauge   30   28   26   24   22   20   18   16   14   12   10
Decimal Equivalent .012 .015 .018 .024 .030 .036 .048 .060 .075 .105 .135
*Standard steel thickness used for panels, purlins and girts.

Fasteners are designed to withstand a varied range of types of loading. Each panel or structural system has its own specific fastener loading requirements. Care must be taken to ensure that the appropriate loading requirements for each application are considered. Typical structural performance criteria that influence fastener design include:

Ultimate Tension Strength
Ultimate Torsion Strength
Ultimate Shear Strength
Pull-out Performance
Pull-over Performance

Ultimate Tension Strength

The point at which a fastener fails under a load exerted in two direct opposite directions.
Ultimate Tension Strength
Typical ultimate tension strengths of each fastener type are provided on the fastener information pages.


Ultimate Torsion Strength

The point at which a fastener fails under a twisting load exerted on the head during installation in a torsional direction.
Ultimate Torsion Strength
Typical ultimate torsion strengths of each fastener type are provided on the fastener information pages.


Ultimate Shear Strength

The point at which a fastener fails under a load exerted in offset opposing directions, usually upon the shank of the fastener.
Ultimate Shear Strength
Typical ultimate shear strengths of each fastener type are provided on the fastener information pages.


Pull-out Performance

The ability of a fastener's threaded connection to remain intact and resist tensile loads.
Pull-out Performance
Self-tapping fasteners require that a pilot hole be drilled prior to installation. The pullout resistance will be directly related to the pilot hole diameter.

Self-drilling fasteners have been developed, and are available, for most steel construction applications, to a metal thickness of 1/2". This type of fastener is manufactured with its own integral drill point, which is engineered to drill the optimum hole size to facilitate efficient thread forming in the metal structure, resulting in optimized pullout values.


Pull-over Performance

The ability of a fastener to resist the pulling of the fastened sheet material over the head of the fastener due to gravity, wind, or other load.
Pull-over Performance
The resistance to pullover failure is related to the strength and diameter of the fastener washer and the strength and thickness of the metal panel.


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