ASME B18.5-2012 pdf download

ASME B18.5-2012 pdf download.Round Head Bolts (Inch Series).
2.1.3 Underhead Fillets. All bolts having flat bearing surface type heads shall have a definite fillet at the junction of head and shank. The minimum radius of fillet shall be equal to one-half of the maximum values specified in the respective dimensional tables. The radius of fillet shall not exceed the values specified in the respective dimensional tables except for bolts produced from nonferrous and corrosion-resistant materials, on which maximum fillets shall he subject to agreement between manufacturer and purchaser.
2.2 Square Neck
2.2.1 Depth of Square. The depth of square shall be measured, parallel to the axis of bolt at the midpoint of the flats of square, from the bottom of square to the bearing surface for bolts having flat bearing surface type heads, and to the intersection of flats of square with the conical bearing surface for bolts having countersunk heads.
2.2.2 Corners of Square. The corners of square neck may be rounded to the extent specified in the respective dimensional tables and need not be filled out for the total depth of square.
2.2.3 Corner Height. The corner height of the square shall be measured, parallel to the axis of bolt from the point where the across corners is at its minimum size to the bearing surface of bolts having flat bearing surface type heads, and to the top of the heads of bolts having countersunk heads. The gage and gaging practice for this measurement is in Mandatory Appendix I.
2.3 Body Diameter
2.3.1 Full Diameter Body. Unless otherwise specified, all bolts covered by this Standard, except round head square neck bolts and round head short square neck bolts, shall be furnished with full diameter body of limits given in the dimensional tables.
2.3.2 Round Head Square Neck and Round Head Short Square Neck Bolt Diameter Body. Unless otherwise specified, round head square neck bolts and round head short square neck bolts shall be furnished with a body diameter having a maximum limit equal to that of the full diameter body and a minimum limit equal to the minimum pitch diameter of the thread as given in the dimensional tables.
2.3.3 Swell or Fin. A swell or fin under the head or tinder corners of square neck shall be permissible, provided it does not affect serviceability, nor exceed the basic bolt diameter by more than the following:
2.8 Materials and Mechanical Properties
2.8.1 Steel. Unless otherwise specified, chemical and mechanical properties of steel bolts, except step bolts and elevator bolts, shall conform to all requirements of ASTM A307, Grade A and shall be stress relieved as required by the standard. Due to peculiarities of the head configurations, steel step bolts and elevator bolts are considered conforming if the ultimate tensile strength in pounds is equal to or greater than 90% of the values indicated in ASTM A307, Grade A.
2.8.2 Other Materials. Additional steel grades are covered in SAE J429. Nonferrous materials are covered in ASTM F468. Corrosion-resistant steels are covered in ASTM F593. Due to peculiarities of the head configurations, step bolts and elevator bolts are considered conforming if the ultimate tensile strength in pounds is equal to or greater than 90% of the full strength material values.
2.9 Identification Symbols
2.9.1 Grade Symbols. Each of the products included in this Standard shall be marked in accordance with the requirements of the applicable specification for its chemistry and mechanical properties.
2.9.2 Source Symbols. Each of the products included in this Standard shall be marked to identify the source accepting responsibility for the conformance of the bolt to this and other applicable specifications.
2.10 Finish
Unless otherwise specified, round head bolts shall be supplied with natural (as processed) finish, unplated or uncoa ted.
2.11 Workmanship
Bolts shall be free from surface imperfections such as burrs, seams, laps, loose scale, and other surface irregularities that could affect serviceability.