1.1 This specification covers the chemical and mechanical requirements of quenched and tempered steel bolts, in nominal thread diameters M16 to M36, inch. These bolts are intended for use in structural joints that are comparable to those made under the Specification for Structural Joints Using ASTM A325 or A490 Bolts issued by the Research Council on Structural Connections of the Engineering Foundation. The various types of bolts covered by this specification are: 1.1.1 Type 1- Bolts made of alloy steel, supplied in nominal thread diameters M16 to M36, inclusive. 1.1.2 Type 2- Bolts made from what is generally described as low-carbon martensite steel, supplied in nominal thread diameters M16 to M24 inclusive. 1.1.3 Type 3- Bolts in nominal thread diameters M16 to M36, inclusive, having atmospheric corrosion resistance and weathering characteristics comparable to that of the steels covered in Specifications A588/A588M, A242/A242M, and A709/A709M. The atmospheric corrosion resistance of these steels is substantially better than that of carbon steel with or without copper addition. See 6.3. When properly exposed to the atmosphere, these steels can be used bare (uncoated) for many applications. 1.2 Unless otherwise specified, all nuts used on these bolts shall conform to the requirements of Specification A563M, shall be heavy hex, and shall be of the class and surface finish for each type of bolt as follows: Bolt Type and Finish Nut Class and Finish 1 and 2, plain (noncoated) 10S, 1053, plain 3, plain 10S3, plain 1.3 Unless otherwise specified, all washers used on these bolts shall conform to the requirements of Specification F436M and shall be of a surface finish for each type of bolt as follows: Bolt Type and Finish Washer Finish 1 and 2, plain (uncoated) plain (uncoated) 3, plain weathering steel, plain 1.4 This specification provides that heavy hex structural bolts and heavy hex nuts shall be furnished unless other dimensional requirements are stipulated in the purchase inquiry and order. Note 1-For quenched and tempered steel bolts, studs, and other externally threaded fasteners with nominal thread diameters larger than M36, but with similar mechanical properties, refer to class 10.9 of Specification F568. Note 2-This specification is the metric companion of Specification A490. |
F1470-24 | Standard Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection |
F1789-26 | Standard Terminology for F16 Mechanical Fasteners |
F2328M-17(2022) | Standard Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws, Studs, and Nuts (Metric) |
G101-04(2025) | Standard Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels |
B1.13M | Metric Screw Threads |
B18.2.3.7M | Metric Heavy Hex Structural Bolts |
B18.24 | Part Identifying Number (PIN) Code System Standard for B18 Fastener Products |
7412 | Hexagon Bolts for High Strength Structural Bolting With Large Width Across Flats (Short Thread Length)-Product Grade C-Property Classes 8.8 and 10.9 |
IFI 144 | Test Evaluation Procedures for Coating Qualification Intended for Use on High-Strength Structural Bolts |
F2833-11 | Standard Specification for Corrosion Protective Fastener Coatings with Zinc Rich Base Coat and Aluminum Organic/Inorganic Type |
A325-14 | Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength (Withdrawn 2016) |
A490-14 | Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength |
A490M-14 | Standard Specification for High-Strength Steel Bolts, Classes 10.9 and 10.9.3, for Structural Steel Joints (Metric) |
A563M-07 | Standard Specification for Carbon and Alloy Steel Nuts [Metric] |
A751-25 | Standard Test Methods and Practices for Chemical Analysis of Steel Products |
D3951-18(2023) | Standard Practice for Commercial Packaging |
E384-22 | Standard Test Method for Microindentation Hardness of Materials |
E1444-05 | Standard Practice for Magnetic Particle Testing |
F436M-11 | Standard Specification for Hardened Steel Washers [Metric] (Withdrawn 2016) |
F568M-07 | Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners (Withdrawn 2012) |
F606M-14 | Standard Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, and Rivets (Metric) (Withdrawn 2015) |
F788/F788M-20(2025) | Standard Specification for Surface Discontinuities of Bolts, Screws, Studs, and Rivets, Inch and Metric Series |
F959M-13 | Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use With Structural Fasteners (Metric) (Withdrawn 2016) |
F1136M-10 | Standard Specification for Zinc/Aluminum Corrosion Protective Coatings for Fasteners [Metric] (Withdrawn 2011) |
E709-21 | Standard Guide for Magnetic Particle Testing |
|