3391Fasteners

3391.1SCOPE

Provide various types and grades of fasteners for use in general and structural applications.

3391.2REQUIREMENTS

Provide fasteners of the type shown on the Plans. Provide bolts, nuts, and washers meeting the requirements of ANSI for the type required by the Contract. Unless otherwise required by the Contract, provide threads that are ANSI Coarse Thread Series with a Class 2A tolerance for bolts and Class 2B tolerance for nuts. A Common Structural Steel Bolts Provide bolts and nuts meeting the requirements of ASTM A307, Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60,000 psi Tensile Strength. For bolts at least 1/2 inch in diameter, use Grade B bolts with heavy hexagon nuts. B High Strength Structural Steel Bolts Provide field and shop bolts for steel Bridges meeting the requirements of ASTM F3125, Standard Specification for High Strength Structural Bolts and Assemblies, Steel and Alloy Steel, Heat Treated, Inch Dimensions 120 ksi and 150 ksi Minimum Tensile Strength, and Metric Dimensions 830 MPa and 1040 MPa Minimum Tensile Strength, Grade A325 Type 3 bolts. Provide bolts that project through the nut from 1/8 inch to 3/8 inch. Provide field and shop nuts for steel Bridges that meet ASTM A563, Standard Specification for Carbon and Alloy Steel Nuts, Grade C3 or DH3 nuts and shop washers for steel Bridges

that meet ASTM F436, Standard Specification for Hardened Steel Washers Inch and Metric Dimensions , Type 3 washers. Provide bolts, nuts, and washers installed before the application of the prime coat, in the uncoated “Black” condition. Apply the same paint coatings to the bolts as applied to the structural steel. Provide mechanically galvanized fasteners that are to be field installed after the application of the prime coat meeting the requirements of ASTM B695, Standard Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel, Class 50 Type 1. For all other Bridges and Structures, provide bolts meeting the requirements of ASTM F3125, Standard Specification for High Strength Structural Bolts and Assemblies, Steel and Alloy Steel, Heat Treated, Inch Dimensions 120 ksi and 150 ksi Minimum Tensile Strength, and Metric Dimensions 830 MPa and 1040 MPa Minimum Tensile Strength, Grade A 325 Type 1 (for painted or galvanized applications) or Type 3 (for unpainted weathering steel applications). Provide bolts that project through the nut from 1/8 inch to 3/8 inch. Provide nuts meeting the requirements of ASTM A563, Standard Specification for Carbon and Alloy Steel Nuts, and washers meeting the requirements of ASTM F436, Standard Specification for Hardened Steel Washers Inch and Metric Dimensions. For bolts meeting the requirements of ASTM F3125, Standard Specification for High Strength Structural Bolts and Assemblies, Steel and Alloy Steel, Heat Treated, Inch Dimensions 120 ksi and 150 ksi Minimum Tensile Strength, and Metric Dimensions 830 MPa and 1040 MPa Minimum Tensile Strength, include Supplementary Requirement S4 Rotational Capacity Testing. Ship required documentation with the fastener assemblies and provide to the Engineer. Do not tension Grade A490 bolts or galvanized Grade A325 bolts more than one time. Uncoated Grade A325 bolts with free spinning nuts and no evidence of elongation may be tensioned up to two times with the Engineer’s written approval. Regardless of specified finish, provide nuts lubricated with a lubricant of contrasting color meeting the requirements of ASTM A563, Standard Specification for Carbon and Alloy Steel Nuts, Supplementary requirements S1, S2, and S3 at the time of the installation of the fasteners. C Bolts for Wood Construction Unless otherwise shown on the Plans, provide bolts for wood construction in accordance with 3391.2A, “Common Structural Steel Bolts,” and galvanized by a mechanical or hot-dip process. Provide the mass of coating meeting the requirements of ASTM A153, Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware. D Stud Welded Fasteners Provide studs in the size and configuration required by the Contract. Provide defect-free, weldable carbon steel studs meeting the requirements of ASTM A108, Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished, for cold drawn bars Grade 1015, Grade 1018, or Grade 1020. For the purpose of welding, provide studs with fluxed tips or fluxed ferrules and equipped with a ceramic ring or ferrule arc shield. Provide Material for the studs meeting the following characteristics:

Provide threaded studs with nuts capable of developing the minimum ultimate strength requirement of the net cross-section area of the threaded portion of the stud.

Provide shear connector studs with a head height and head diameter within a dimensional tolerance of 1/16 inch. Identify stud containers by the heat number of the steel from which the studs were produced. E Stainless Steel Bolts Provide stainless steel bolts made of Material meeting the requirements of ASTM F593, Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs, Condition CW1, Type 304, Type 316, or Type 316L. Provide finished bolts with the following characteristics:

Provide stainless steel nuts made of Material meeting the requirements of ASTM F594, Standard Specification for Stainless Steel Nuts, Condition CW1, Type 304, 316, or 316L. After fabrication (if required), fully anneal bolts, nuts, and washers to promote maximum corrosion resistance of the stainless steel. After heat treatment, give parts a pacifying treatment in a nitric acid solution. Perform the pacifying treatment in accordance with standard commercial practice. Provide bolts of dimensions meeting the requirements of ANSI B 18.2 for Regular Hexagon-head Cap Screws. Finish surfaces in accordance with the American bolt, nut and rivet manufacturers . Provide nuts meeting the requirements for ANSI B 18.2 for Regular Finished Hexagon. Provide washers as shown on the Plans. F Tension Indicators Provide and test compressible-washer-type, direct tension indicators (DTI) in accordance with ASTM F959, Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners, Inch and Metric Series. Submit three samples of each lot of tension indicators with the test reports to the Materials Laboratory for testing. The Engineer will reject lots if the representative washer samples fail the tests performed.

3391.3SAMPLING AND TESTING

If the minimum bolt strength requirements are specified in the Contract, perform testing in accordance with ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products , except only use a wedge for testing high-strength structural steel bolts. Do not use reduced-dimension specimens for test purposes. Determine the yield strength using relevant methods specified in ASTM E8, Standard Test Methods for Tension Testing of Metallic Materials. For bolts with nuts, provide nuts capable of withstanding a proof load equal to the required tensile strength of the bolt. Provide test bolts and nuts of each type, in each size and length. Provide 2 test bolts and nuts for each increment of 1,000, or fraction of 1,000, bolts supplied.