ASME B18.10 pdf download

ASME B18.10 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 HIS. lO-19S2. 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.
2.3 Body Diameters
This Standard provides for two styles of body diameters, Bolts shall be provided with a fuLl size body in accordance with the respective table dimensions ol Table I or 2 for body diameter, E, unless a reduced body diameter is specified on the purchase order, These shall have a body diameter not less than the minimum pitch diameter of the thread and not exceeding the minimum body diameter, E, shown in Table 1 or 2.
2.4 Bo4t Length
The bolt length shall be the distance measured parallel to the axis of the product from the bearing surface of the head to the extreme end of the bolt, including the point if the product is pointed.
2.5 Threads
Bolt threads shall be rolled unless otherwise agreed to between the purchaser and the supplier.
Threads shall be Unified lnh Series. Class 2A as specified in respective dimensional tables in ASME 131.1.
2.5.1 Thread Acceptance Gaging. Unless otherwise specified, dimensional acceptatilitvy of screw threads shall be determined based on System 21, ASMIi 131.3M.
2.6 Thread Length
The length ot thread shall be measured parallel to the axis of the boll from the end of the bolt to the last ctwnplete (fully formed) thread, The minimum thread length. L1, shall be as shown in Tables I and 1 The tolerance on thread length shall be + 0.187 in. or 2.5 X pitch, whichever is greater. Bolts of nominal lengths too short to accommodate the minimum thread lengths shall be threaded full length. The distance from the neck to the first complete (full form) thread shall not exceed thwads for sues tip to and including I in. and 3 threads for sizes over I in.