ASME B18.3:2012 pdf free download

ASME B18.3:2012 pdf free download.Socket Cap, Shoulder, Set Screws, and Hex Keys (Inch Series).
A periodic review of the standard, undertaken by Subcommittee 3 in 1973, resulted in agreement that the document be revised to reflect clarification of the underhead fillet on socket head cap screws, add coverage on drilled socket head cap screws, lengthen the thread undercut on socket head shoulder screws, and extend the coverage on the latter to include the 1’/z-in., 1-in., and 2-in, sizes. A proposal incorporating these changes together with numerous editorial corrections was prepared and, subsequent to Subcommittee acceptance, approved by letter ballot to American National Standards Committee B18. Following approval by the sponsor organizations, the proposal was submitted to the American National Standards Institute and designated an American National Standard on November 1, 1976.
A periodic review of the standard, undertaken by the Subcommittee in 1980, resulted in agreement that the document be revised
(a) to clarify the notes on screw point chamfers
(b) in socket tolerances for large sockets and in counterbore sizes to reflect standard tooling
(c) to reference ASTM A574 for the appropriate mechanical and chemical requirements
A proposal containing these changes, as well as many editorial corrections, was prepared for and balloted by letter ballot to the ASME Committee 818. Following approval by the sponsor organization, the proposal was submitted to the American National Standards Institute and designated an American National Standard on January 4, 1982.
A periodic review of the standard, undertaken by the Committee in 1985, resulted in agreement that the document be revised to clarify the dimensions with respect to plated products, and to incorporate by reference the new ASTM documents for the appropriate mechanical, chemical, and testing requirements for the button head, flat countersunk head, and set screw products. A proposal containing these changes, as well as editorial corrections, was prepared and balloted by letter ballot to ASME Committee BiS. Following approval by ASME, the proposal was submitted to the American National Standards Institute and designated an American National Standard on August 7, 1986.
A periodic review of this Standard was undertaken by the Committee in 1990. Based on this review, it was determined that the document needed significant revisions to clarify and update the Standard. These revisions would need to address the technical changes in manufacturing methods and changes in the standards community. To accomplish this objective, established quality standards were recognized and integrated into the Standard. In addition, designated characteristics for each product and product identification were established and gaging techniques for countersunk screws were added. These changes were halloted and approved by the ASME B18 Committee. The proposal was submitted to the American National Standards Institute and designated an American National Standard on January 14, 1998.