Standard Specification for Hardened Steel Backup and Reaction Washers Inch and Metric DimensionsTranslate name
STANDARD published on 1.1.2020
Designation standards: ASTM F3394/F3394M-20
Publication date standards: 1.1.2020
The number of pages: 7
Approximate weight : 21 g (0.05 lbs)
Country: American technical standard
Category: Technical standards ASTM
alloy steel, backup washer, carbon steel, reaction washer, steel, washers, weathering steel,
1.1 This specification covers the chemical, mechanical, and dimensional requirements for hardened steel Backup and Reaction washers for use with fasteners having nominal diameters of 1/2 in. through 3 in. and M14 through M80. These washers are intended for general-purpose mechanical and structural use with bolts, nuts, studs, DTIs, and other internally and externally threaded fasteners. These washers are suitable for use with fasteners covered in Specifications , , , , , , , , and .
1.2 The washers are designated by 1.2.1 The styles of washers covered are:
22.214.171.124 Reaction—Circular washers with a knurled surface on one side and a contoured outside diameter designed to couple with the installation tool.
126.96.36.199 Backup—Circular washers having a knurled surface on both sides.
1.2.2 The types of washers covered are:
188.8.131.52 Type 1—Medium Carbon or Medium Carbon Alloy Steel.
184.108.40.206 Type 3—Weathering steel. This specification provides for furnishing Type 3 to chemical composition or a Corrosion Index (CRI) of 6 or higher, at the supplier’s option.
1.3 The values stated in either inch-pound units for inch fasteners and SI units for metric fasteners and are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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