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Screw Substitution Calculator

The Screw Substitution Calculator is a quick, easy-to-use tool for providing Simpson Strong-Tie structural screw alternatives to specified standard NDS fasteners in withdrawal, lateral load parallel-to-grain, lateral load perpendicular-to-grain and multi-ply connections. The Calculator provides detailed load calculations for both the NDS fastener and the recommended Simpson Strong-Tie structural screw.

Withdrawal Loading

Withdrawal
Loading

Lateral Load Parallel To Grain

Lateral Load
Parallel To Grain

Lateral Load Perpendicular To Grain

Lateral Load Perpendicular to Grain

Multi-Ply Connections

Multi-Ply
Connections

General

Select Application
Fastener
Substitution
Select the specified fastener information under "Fastener Information" below. Available fastening options are bolts, lag screws, wood screws, and nails. Bolts or lag screws should meet the requirements of ANSI/ASME Standard B18.2.1. Wood screws should meet the requirements of ANSI/ASME B18.6.1 and nails should meet the requirements in ASTM F1667.
OR
Load Entry
Enter a Load Entry value < 100,000 lb.
Enter the load experienced by the connection.
lb
Code
Enter Design Code information.

Fasteners can be designed per NDS 2005 or NDS 2012.

Codes Reference/Specifications
International Residential Code 2006 (IRC 2006) AFPA NDS 2005
International Residential Code 2009 (IRC 2009) AFPA NDS 2005
International Residential Code 2012 (IRC 2012) AFPA NDS 2012
International Building Code 2006 (IBC 2006) AFPA NDS 2005
International Building Code 2009 (IBC 2009) AFPA NDS 2005
International Building Code 2009 (IBC 2009) AFPA NDS 2005
International Building Code 2012 (IBC 2012) AFPA NDS 2012

Design Method
Select the design method. Available options to choose from are ASD, LRFD or Not Specified. If the design method is not known, select "Not Specified" and the program assumes LRFD design method and designs conservatively based on the moisture and temperature of wood selected.
Allowable Stress Method has been assumed. Please enter the following inputs to help determine the appropriate adjustment factors for your connection.
Wood Moisture Content
Select moisture service condition of wood. For connections in wood that is unseasoned or partially seasoned, or when connections are exposed to wet service conditions in use, wet service factor, CM is applied. If you do not know the moisture content of wood select Unknown
Connection Temperature
Select connection temperature: Temperature factors are applied to connections that will experience sustained exposure to elevated temperatures up to 150 °F. If you do not know the connection temperature select Unknown
End Grain Insertion
Select the fastener insertion into the end grain of the main member. If the fastener is inserted into the end grain then the answer is yes. If you do not know or are unsure select Unknown
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