Caution is advised when specifying stainless steel fasteners
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Stainless steel fasteners are often chosen to replace carbon steel fasteners in many engineering applications. These fasteners offer some advantages over their carbon steel counterparts—most notably, increased corrosion resistance. However, stainless steel fasteners have a tendency to gall, or cold weld, when in contact with a mating stainless steel fastener of similar composition when the proper precautions are not taken. Galling can vary in severity, and may be only a nuisance when minor, but lead to fastener failure in the extreme. This paper describes the galling of a threaded stainless steel ejector rod from a laser guided training round (LGTR) used by the U.S. Navy. Also presented are the precautions that should have been taken to avoid galling.
Keywordsgalling laser-guided training round stainless steel fasteners
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- 1.Anon: “Standard Specification for Free-Machining Stainless Steel Wire and Wire Rods,” ASTM A 581/A 581M, ASTM, W. Conshohocken, PA, 1995.Google Scholar
- 2.Anon: Military Standard MS35425-42, “Nut, Plain, Wing, UNC-2B,” U.S. Department of Defense, last revision July 30, 1987.Google Scholar
- 3.Anon: “Standard Hardness Conversion Table for Metals: Relationship among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness and Scleroscope Hardness,” ASTM E 140, ASTM, W. Conshohocken, PA, 1997.Google Scholar
- 4.G.F. Vander Voort and H.M. James: “Wrought Stainless Steels,” Metallography and Microstructures, vol. 9, Metals Handbook, 9th ed., American Society for Metals, Metals Park, OH, 1985, p. 291.Google Scholar
- 5.J.H. Bickford: An Introduction to the Design and Behavior of Bolted Joints, 3rd ed., Marcel Dekker, Inc., New York, 1995, p. 523.Google Scholar
- 6.Anon: Industrial Fastener Institute’s Sixth Edition Fastener Standards Book, C.J. Wilson, ed., Industrial Fasteners Institute, Cleveland, OH, 1988, p. B-28.Google Scholar
- 7.J. Greenslade: “How to Stop Thread Galling on Stainless Fasteners,” Am. Fasten. J., Jul/Aug 1995, p. 7.Google Scholar