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Title: Analytical Determination of the Surface Area of a Threaded Fastener

Source: Journal of Testing and Evaluation, Vol. 36, No. 1 Paper ID JTE100806 Available online at:

Author(s)Rammer Douglas R., Zelinka Samuel L.

Publication Year: 2008  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4714-1A

Abstract: Accurate determination of corrosion rates for threaded fasteners hinges on the ability to determine the surface area on which corrosion is occurring. Currently, no general analytical expression of surface area exists for the threaded fastener types. A recent voluntary withdrawal of chromated copper arsenate as the primary, long-standing preservative treatment for wood resulted in the need to determine the corrosion rates of threaded fasteners. This paper developed general analytical surface area equations for a wedge-shaped thread and the area between the threads for three cases: (1) an increasing thread root and crest diameter, (2) constant thread root and crest diameters, and (3) a constant thread root but a decreasing thread crest diameter. The expressions are applied, numerically verified, and compared to simplified models for a No. 10-2.54 cm (1-in.) long wood screw.

Keywords: Metals; testing; fasteners; corrosion; joints; failure; screws; mathematical models; equations; wood preservatives; connectors; surface area; preservatives; chromated copper arsenate; CCA; preservative treated wood; treated wood

File size: 149 kb(s)

Date posted: 11/20/2009

This publication is also viewable on Treesearch:  view
RITS Product ID: 26460
Current FPL Scientists associated with this product (listed alphabetically)
Rammer, Douglas R.
Research General Engineer
Zelinka, Samuel L.
Materials Research Engineer

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