2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS CATEGORY 900 MATERIALS SECTION 909 — METALS
909.00 Certification
TC-1.03. The metal producer shall furnish certification as specified. Certification shall include actual mill test results and the chemical and physical properties of the finished metal products.
909.01 Structural Steel
Structural steel shall meet the following:
a.M 270, Zone 2. All primary load carrying members shall meet the supplementary toughness requirements.
b.Primary load carrying members are as follows or as specified.
1.Finger joint steel from which saw tooth configurations have been cut, all stringers, cover plates, bearing stiffeners, splice plates, pins and pin links for straight rolled steel beam bridges; all flanges, webs, bearing stiffeners, splice plates, pins and pin links for straight steel girder bridges.
2.Curved rolled steel beam and steel girder bridges; all diaphragms, cross frames, lateral bracing, including connection plates to main stringers.
909.02 Steel for Miscellaneous Use
A36, A572 or A709, Grade 36 or 50. Steel for bearings on structures shall conform to A709, Grade 50.
909.03 Welding Materials
AWS D1.5 or D1.1 according to design criteria.
909.04 Gray Iron Castings
A48, Class 30B.
909.05 Steel Stud Shear Developers
AWS D1.5 or D1.1 according to design criteria. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
909.06 Bolts, Nuts, and Washers for General Use
Galvanize all according to F2329 when required. High temperature galvanizing not allowed.
a.Bolts, A307.
b.Anchor bolts F1554, Grade 55, S1. (c) Washers, F436. (d) Nuts, A563, Grade A.
909.07 High Strength Fasteners, Bolts, Nuts, and Washers
F3125, Grade A325, Type 1 or 3. High temperature galvanizing is not allowed.
a.Galvanize Type 1 according to F2329 when required. (b) Use A325, Type 3 on weathering steel. (c) Washers and nuts shall meet A325 -Table 1. Perform rotational capacity testing on all high strength fasteners according to MSMT 710 .
909.08 Anchor Bolts, Nuts, Washers for Traffic Signals,
HIGHWAY LIGHTING, AND SIGNS
a.F1554, Grade 55 S1.
b.Anchor bolts, galvanized for the full length of the threads and at least 3 in. below the threads.
c.Nuts, heavy hex, A194, Grade 2H or A563, Grade DH. (d) Flat washers, heavy washers, F436. (e) Galvanized according to F2329. High-temperature galvanizing is not acceptable.
909.09 Cast Washers
Cast washers, ogee washers, and special cast washers according to A48. Hot dipped galvanized according to A153.
909.10 Hardware
F1667. Spikes, wood screws, staples, brads, lag screws, carriage bolts, and other parts under general hardware shall be composed of carbon steel.
909.11 Steel Forms
A653, Designation SS, Grades 33 through 80S. Steel bridge deck forms and deck form supports that remain in place shall be fabricated as specified. Steel forms shall be coated according to Coating Designation G165. The minimum thickness of uncoated steel shall be 0.0359 in.
909.12 Metal Reinforced Epoxy Filler
METAL REINFORCED EPOXY FILLER. The metal reinforced epoxy filler shall be a metal reinforced epoxy/polymeric compound that is designed to rebuild, restore, and repair metal surfaces. The manufacturer shall furnish actual test results for each batch of epoxy filler submitted showing the following: TEST PROPERTY TEST METHOD SPECIFICATION LIMITS Compressive Strength (psi) D 695 8000 Adhesive Tensile Shear Strength (psi) D 1002 900 Flexural Strength (psi) D 790 5000 Specific Gravity D 792 1.5 – 2.5 Cured Hardness, Durometer (Shore D) D 2240 80 ± 5 Cured Shrinkage (%) D 2566 < 1 Color — Grey or Black 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 910 — BEARINGS CATEGORY 900 MATERIALS SECTION 910 — BEARINGS
910.00 Certification
The bearing producer shall furnish certification as specified in TC-1.03. The certification shall include actual mill test results. The chemical and physical properties of the finished bearings shall also be furnished by the processing manufacturer.
910.01 Bronze Or Copper Alloy Bearing and Expansion
PLATES Either of cast bronze or rolled copper alloy.
910.01.01 Cast Bronze. B22, Alloy No. 91100 or No. 91300.
Self-lubricating bronze bearing plates shall be an article of standard production by an approved manufacturer of such equipment. They shall be provided with trepanned recesses (not grooves) that shall be filled with a lubricating compound consisting of graphite and metallic substances with a lubricating binder capable of withstanding the atmospheric elements. The lubrication compound shall be compressed into the recesses by pressure to form dense, nonplastic lubricating inserts. The lubricating area shall comprise at least 25 percent of the total area. The static coefficient of friction shall not exceed 0.10. The certification shall be as specified above and shall include the actual test results showing that bearing plates of the same design as those supplied meet the static coefficient of friction requirements. Test specimens shall be at least 4 in. long by 4 in. wide. The static coefficient of friction shall be determined by testing a specimen plate subjected to a vertical pressure of 1000 psi and 1000 cycles consisting of 1/2 in. horizontal strokes at a speed not to exceed 9 cycles per minute. Conduct testing at an ambient temperature of 77 ± 9 F. The static coefficient of friction on the specimen bearing plate shall be calculated by dividing the total applied vertical load on the plate into the total horizontal load required to start motion between the bearing plate and it’s mating surface while subject to the vertical load. Upon completion of the test, the bronze plate shall show no signs of galling.
910.01.02 Rolled Copper. Per PB 100, Alloy No. 51000.
2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 969–971 of 1,113.