1.1 This specification covers requirements of various types of quenched and tempered steel bolts in nominal thread diameters M16 to M36 inclusive, commonly known as "high-strength structural bolts," intended for use in structural joints that are comparable to those made under the Specifications for Structural Joints Using ASTM A325 or A490 Bolts, issued by the Research Council on Structural Connections of the Engineering Foundation. Types of bolts covered in this specification are: 1.1.1 Type 1 -Bolts made of medium-carbon steel. 1.1.2 Type 2 -Bolts made from what is generally described as low-carbon martensite steel. 1.1.3 Type 3 -Bolts made of steel having atmospheric corrosion resistance and weathering characteristics comparable to that of the steel 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 5.3). When properly exposed to the atmosphere, these steels can be used bare (uncoated) for many applications. 1.2 This specification provides that heavy hex structural bolts shall be furnished unless other dimensional requirements are stipulated in the purchase inquiry and order. 1.3 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) 8S or 8S3, plain 1 and 2, zinc-coated 10S, zinc-coated 3, plain 8S3, plain 1.4 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) 1 and 2, zinc-coated 3, plain weathering steel, plain 1.5 Zinc-coated bolts and nuts shall be shipped in the same container. |
Specification for Structural Joints Using High-Strength Bolts | |
B?18.18.3M | Inspection and Quality Assurance for Special Purpose Fasteners |
B?18.2.3.7M | Metric Heavy Hex Structural Bolts |
B?1.13M | Metric Screw Threads |
F1789-26 | Standard Terminology for F16 Mechanical Fasteners |
F1470-24 | Standard Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection |
F1136M-10 | Standard Specification for Zinc/Aluminum Corrosion Protective Coatings for Fasteners [Metric] (Withdrawn 2011) |
F959M-13 | Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use With Structural Fasteners (Metric) (Withdrawn 2016) |
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F606M-14 | Standard Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, and Rivets (Metric) (Withdrawn 2015) |
F436M-11 | Standard Specification for Hardened Steel Washers [Metric] (Withdrawn 2016) |
D3951-18(2023) | Standard Practice for Commercial Packaging |
B695-21 | Standard Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel |
A751-25 | Standard Test Methods and Practices for Chemical Analysis of Steel Products |
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A153/A153M-23 | Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware |
G101-04(2025) | Standard Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels |
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