Designation: F3125/F3125M − 26Standard Specif i cation forHigh Strength Structural Bolts and Assemblies, Steel andAlloy Steel, Heat Treated, Inch Dimensions 120 ksi, 144 ksi,and 150 ksi Minimum Tensile Strength, and MetricDimensions 830 MPa and 1040 MPa Minimum TensileStrength 1This standard is issued under the f i xed designation F3125/F3125M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specif i cation covers chemical, physical and me-chanical requirements for quenched and tempered bolts manu-factured from steel and alloy steel, in inch and metricdimensions, in two strength grades, two types and two styles.1.1.1 This specif i cation was originally issued as a consoli-dation and replacement of six structural bolting ASTMstandards, including;A325,A325M,A490,A490M, F1852 andF2280. One additional fastener grade, 144 ksi, is added withtwo types and two styles for inch series only.1.2 Intended Use:1.2.1 Bolts manufactured under this specif i cation are in-tended for use in structural connections covered in the Speci-f i cation for Structural Joints Using High-Strength Bolts, asapproved by the Research Council on Structural Connections.1.2.2 Grade A325 and Grade A490 Heavy Hex style in thisspecif i cation are furnished in sizes1 ⁄ 2 to 1 1 ⁄ 2 in. inclusive.1.2.3 Grade A325M and Grade A490M Heavy Hex stylesare furnished in sizes from M12 to M36 inclusive.1.2.4 Grade F1852 and Grade F2280 Twist-Off style assem-blies are furnished in sizes1 ⁄ 2 to 1 1 ⁄ 4 in. inclusive.1.2.5 Grade 144 Twist-Off style assemblies and Heavy Hexstyle are furnished in sizes1 ⁄ 2 to 1 1 ⁄ 4 in. inclusive.1.3 Classif i cation, Table 1:1.3.1 Bolts are designated by grade, or group (at themanufacturer’s option), which indicates inch or metric strengthand style.1.3.2 Bolts are designated by type denoting raw materialchemical composition.1.3.3 Bolts are designated by style denoting Heavy Hexbolts or “Twist-Off” style assemblies.1.4 Terms used in this specif i cation are def i ned in F1789.1.5 Units—The values stated in either SI units or inch poundunits are to be regarded separately as standard. The valuesstated in each system may not be exact equivalents; therefore,each system shall be used independently of the other. Combin-ing values from the two systems may result in non-conformance with the standard.1.6 Table footnotes are requirements. Notes are advisory.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 2A194/A194M Specif i cation for Carbon Steel, Alloy Steel,and Stainless Steel Nuts for Bolts for High Pressure orHigh Temperature Service, or BothA354 Specif i cation for Quenched and Tempered Alloy SteelBolts, Studs, and Other Externally Threaded FastenersA449 Specif i cation for Hex Cap Screws, Bolts and Studs,Steel, Heat Treated, 120/105/90 ksi Minimum TensileStrength, General UseA563/A563M Specif i cation for Carbon andAlloy Steel Nuts(Inch and Metric)1 This specif i cation is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,Studs and Nuts.Current edition approved July 1, 2026. Published July 2026. Originally publishedin 2015. Last previous edition published in 2025 as F3125 – 25a. DOI: 10.1520/F3125_F3125M-26.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.*A Summary of Changes section appears at the end of this standardCopyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1
