- 895 - SECTION 1057 -- LOW CARB ON STEEL FASTENERS
1057.01 Description
1.This Specification covers re quirements applicable to low-carbon steel standard fasteners, non-headed anchor bolts, and the nuts and washers used with each.
1057.02 Material Characteristics
1.Bolt threads may be cut or rolle d and shall meet the latest ANSI thread tolerances for the specified thread series.
2.All threads shall be full and sound. 3. The specified diamet er of the bolt shall be taken to mean the overall diameter of the threads.
4.The diameter of the shank shall in all cases be not less than the root diameter of the thread.
5.Low carbon bolts and nuts shall conform to ASTM A 307 or ASTM F 568.
6.Low carbon washers shall conform to ANSI B 18.22.M or ANSI B 18.22.1.
7.Washers used with low carbon bolts may be plain or hardened. 8. The Contractor may provide ei ther English or metric bolts in accordance with Table 1058.01.
1057.03 Acceptance Requirements
1.Low carbon steel fasteners will be accepted based on requirements of this Section and sampling and te sting requirements in accordance with the Department’s Materials Sampling Guide . - 896 - SECTION 1058 -- HIGH TENSILE BOLTS, NUTS, AND WASHERS
1058.01 Description
1.All high strength bolts s hall meet the requirements in ASTM A 325/A 325M and the modification in this Section.
2.All high strength nuts shall meet the requirements in ASTM A 563/A 563M, or ASTM A 194 and the modifications in this Section.
3.Hardened steel washers shall meet the requirements in ASTM F 436/F 436M and the modifications in this Section.
4.All bolts, nuts, and washers shall be plain (uncoated) unless otherwise specified.
5.Other fasteners or fastener asse mblies not referenced in this Specification, such as those conf orming to the requirements of ASTM F 1852, may be used subject to the appr oval of the Engineer and must be tested and approved by the Departm ent before use provided that:
a.They meet materials, manufacturing, and chemical composition requirements of AASHTO M 164 (ASTM A 325).
b.They meet mechanical pr operty requirements of the same specification in full-size tests.
c.The body diameter and bear ing areas under the head and nut, or their equivalent, shall not be less than those provided by a bolt and nut of the same nominal dimensions describ ed in Section 6 of the AASHTO LRFD Bridge Design Specifications.
1.Such alternate fasteners may differ in other dimensions from those of the bolts, nuts, and wa shers specified in Section 6 of the AASHTO LRFD Bridge Design Specifications.
1058.02 Material Characteristics
1.Bolts:
a.The maximum tensile strength for bolts with a diameter that is equal to or less than 1 inch (25 mm) shall be 150,000 psi (1034 MPa). Bolts with diameters that are larger than 1 inch (25 mm) shall have a maximum tensile strength equal to 120,000 psi (827 MPa).
b.Type 3 bolts, nuts, and washers must be used to assemble "weathering" steel structures. When stru ctures are painted, the bolts and the compatible nuts and washers may be Type 1 or Type 3.
2.Nuts:
a.If nuts are to be galvanized (hot dip or mechanically galvanized), they shall be heat treated grade 10S or 10S3 (2H, DH, or DH3).
b.Plain (uncoated) nuts shall be grades 8S or 8S3 (2, C, D, or C3) with a minimum Rockwell hardness of B89 (Brinell hardness of 180), or heat treated grades 10S or 10S3 (2H, DH, or DH3).
c.If nuts are to be galvanized, they shall be tapped oversize the minimum amount required for proper as sembly. The amount of overtap in the nut shall be so the nut assemble s freely on the bolt in the coated condition and shall meet the me chanical requirements of ASTM Specifications as indicated for nuts in Subsection 1058.01 above.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 929–929 of 1,048.