This SAE Information Report is provided as an advisory guide. Careful discretion as to application is recommended. The content has been presented as accurately as possible, but responsiblity for its application lies with the user. It covers finishes applied to fasteners and related topics, corrosion resistance, lubricity, electrical grounding, ultraviolet light, and embrittlement. Table 1 lists these coatings and their properties so that finish selection can be reasonably made in accordance with known and anticipated fastener assembly applications. Application of protective coatings will affect fastener dimensions. This is especially critical for the thread fit of mating parts because the pitch diameter increases by four times the coating thickness. Explanation is covered in Section 5.
This Information Report covers technology, products, or processes for which technical expertise no longer resides in the owning committee. Current finish specifications for additional information include the following: ASTM F1941/1941M (Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric); ASTM F2833 (Standard Specification for Corrosion Protective Fastener Coatings with Zinc Rich Base Coat and Aluminum Organic/Inorganic Type); ASTM F3019/F3019M (Standard Specification for Chromium Free Zinc-Flake Composite, with or without Integral Lubricant, Corrosion Protective Coatings for Fasteners); ISO 4042 (Fasteners - Electroplating Systems), ISO 10683 (Fasteners - Non Electrolytically Applied Coatings), ISO 10684 (Fasteners - Hot Dip Galvanized Coatings), ISO 16048 (Passivation of Corrosion-Resistant Stainless-Steel Fasteners), and ISO 11408 (Chemical Conversion Coatings - Black Oxide Coating on Iron and Steel - Specification and Test Methods).