ASME B18.10-2006 pdf download

ASME B18.10-2006 pdf download.Track Bolts and Nuts.
Following its reorganization, the Sectional Committee in February 1947 decided that a further study should be made of the existing standards. Some types and sizes were no longer required nor specified by users. Furthermore, manufacturers presented data on the multiplicity of designs and dimensional features of nuts and bolts which complicated stock sizes, dies, and tools.
Therefore, a new subcommittee was formed in May 1947. It was agreed that a comprehensive series of tests would be beneficial, particularly in determining dimensional features of track nuts as compared to the strength and design of the track bolt. Plans for the tests were developed in detail and conducted at one of the Republic Steel Corporation’s plants in Cleveland, Ohio during 1947 and 1948. These tests were mostly of the static tension type and involved hundreds of specimens and literally thousands of measurements.
Analysis of these tests indicated the desirability of making a series of torque tests which would be more in the nature of actual usage of track bolts and nuts in service.
Testing equipment was assembled and the actual work was conducted at the Roanoke, Virginia Shops of the Norfolk & Western Railway during 1949, using special equipment devised for the purpose. The resulting data have served as a guide in arriving at the revised standards presented in the table.
Practical features were also taken into consideration in connection with some of the dimensions, both of track bolts and track bolt nuts, to provide for usage in the field. All of the sizes in use for specific applications have not been included, because it would be impossible to incorporate all special sizes without enlarging the tables to an impractical extent.
The Subcommittee worked closely with committees of the American Railway Engineering Association and the American Iron and Steel Institute having jurisdiction in track bolt and nut standardization. These committees concur in principle with the revision that has been prepared. Their assistance and cooperation in arriving at the revised standards were important and are fully recognized.
The foregoing work resulted in the issuance of a revised standard known as American Standard Track Bolts and Nuts ASA B18.1O-1952. All types of track bolts and nuts used by the various railroads and electric railways in the United States and Canada were studied by the committee, and it is their belief that the recommended dimensions are based on sound engineering design to meet existing conditions, present usage, and where possible, simplification of manufacture. Manufacturers of track bolts and nuts furnished data to the committee on sizes and types purchased over an extended period to determine the most generally used design. A program of static and torsion testing was conducted to establish the best engineering design, taking into account present-day joint bar designs, use of power wrenches, and other factors.
At a meeting on May 23, 1958, the Subcommittee proposed that several revisions of the standards be considered to simplify certain features and bring them up to date. These revisions were given further study in collaboration with the AREA Rail Committee.
2.9 Track Bolt Nuts
Track bolt nuts shall be dimensionally in accordance with ASME B18.2.2. Selected sizes are included in Table 3.
2.10 Finish
Unless otherwise specified, bolts and nuts shall be supplied with a plain (as processed) finish, unplated or uncoa ted.
2.11 Workmanship
Bolts and nuts shall be visually, without magnification, free from burrs, seams, laps, loose scales, irregular surfaces, and any defects affecting their serviceability.
When control of surface discontinuities for bolts is required, the purchaser shall specify conformance to
ASTM F 788/F 788M.
When control of surface discontinuities for nuts is required, the purchaser shall specify conformance to
ASTM F 812/F 812M.
2.12 Designation
Bolts and nuts shall be designated by data in the following sequences as shown:
(a) product name
(Zi) nominal size (fractional or decimal equivalent)
(c) threads per inch
(d) product length (fractional or two-place decimal equivalent)
(e) material, including specification where necessary
( protective finish if required
See the following examples:
EXAMPLES:
(1) Oval neck track bolt, ASME B18.1O, 7,_9 X 21/a, steel, ASTM A 449, Type 3, plain finish
(2) Heavy square nut, ASME B18.1O, 9. steel, ASTM A 563, Grade DH, plain finish
2.13 Identification Symbols
2.13.1 Grade Symbols. Each track bolt and track nut shall be marked in accordance with its material, mechanical, or performance requirements.
2.13.2 Source Symbols. All track bolts and track nuts shall be marked to identify the manufacturing source using a mark registered with U.S. Patent and Trademark Office in accordance with the Fastener Quality Act.