ASME B18.5 pdf download

ASME B18.5 pdf download.Round Head Bolts(Inch Series).
2.4.3 Straightness. The length ot any permissible swell on the body under the head or neck of bolts shall be excluded from checks for shank straightness. Straightness requirements, a suggested gage, and a gaging procedure for checking straightness are in
ASME 1118.2.9.
2.5 Threads
Uncoated threads shall be Unified coarse (UNC or UNRC Series), Class 2A, in accordance with ASME Bl.1. Coated threads shall be accepted based on 3A high limits and ZA low limits.
Unless otherwise specified, gaging for screw thread dimensional acceptability shall be in accordance with Gaging System 21 .is specified in ASME 111.3.
2.6 Length of Thread
2.6.1 Measurement. The length of thread shall be measured, parallel to the axis of the bolt, from the end 04 the boll In the last complete (full form) thread.
2.6.2 Minimum Thread Length. The minimum length of thread shall be equal to twice the basic bolt diatneter plus 0.25 in. for nominal boll lengths of 6 in. or shorter, and twice the basic boll diameter plus 0.50 in. for longer nominal lengths
Bolts of nominal lengths too short to accommodate the minimum thread lengths shall be threaded full length. The length from the head or neck to the first complete (full form) thread shall not exceed the length of 2’4 threads for sizes up to and induding I in.. and 3’4 threads for shies over I in.
2.7 PoInts
Bolts need not be pointed.
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 1429. Nonferrous materials are covered in ASTM 146W Corrosion-resistant steels are covered in ASTM fl93. Doe to peculiarities of the head configura• tions, step bolts and elevator bolts are considered conforming lithe ultimate tensile strength in pounds Is equal to or greater than 9(YO of the full strength material values.
2.9 IdentifIcation Symbols
2.9.1 GradeSynibols. Eachoftheproductsincluded 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 uncoated.
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.