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This proposal was finally approved and designated a Tentative American Standard in February A first revision of the document was designated as an American Standard in March and was followed by a second revision which was granted approval as an American Standard in January Following reorganization of the B18 Committee in , Subcommittee 2 was asked to expand the standard on head proportions into a complete product standard. A proposal covering square andhexagon head bolts and nuts,hexagon head cap screws, and automotive hexagon headbolts was prepared and submitted to the B18 Committee in April While this draft was under consideration, theB18 Committee received a proposal fromthe British Standards Institution for Unification of dimensions on products incorporating unified screw threads.
The Committee welcomed the opportunity of discussing the proposals and an American-British-Canadian Conference was held in New York on June 1 and 2, It was agreed in the conference that the essentials of unification could be accomplished by selection of mutually satisfactory across-the-flats dimensions, since this would permit the use of the same wrenches and because other features would rarely affect interchangeability.
After due consideration, suitable existing across-the-flats dimensions were selectedfor the hexagon products affected. In its meeting October 13,, Subcommittee 2 agreed to incorporate in the proposed of 4 8 standard the conference recommendations on y in. In view of the prgress made in the United States and the urgency of standardization for mutual defense, the British Standards Institution sponsored a second Conference in London in April to complete the unification of certain hexagon bolts and nuts.
At a meeting on June 8, , Subcommittee 2 reaffirmed its acceptance of the unified dimensions which correspond with those in theMarch draft, but attemptedto select better nomenclature for the unified products.
A final draft incorporating the nomenclatureiii. Finished Hexagon Bolts and Nuts andcontaining numerous editorial changes was submitted for letter ballot in September Following approval by the B18 committee and the sponsors, the proposal was presented to the American Standards Association for approval and designation as an American Standard.
This was granted on March 24, It being recognized the standard was in need of additional refinements, Subcommitthat tee 2 began workimmediately to eliminate these shortcomings. A proposed revision removing inconsistencies with respect fillets, improving the length tolerances on heavy hexagon to bolts, and incorporating numerous other corrections and clarifications of an editorial nature, resulted. The most noteworthy editorial change was a decision to combine the coverage for hexagon cap screws and square head set screwsfrom the B The requirements for the unified hexagon cap screws and finished hexagon bolts being identical in the overlapping sizes, the datawould now be available in two publications.
Following approvals by the B18 Committee and sponsor organizations, the proposal was submitted to theAmerican Standards Association and declared an American Standard on February 2, A revision of this document comprised of numerous editorial corrections and inclusion of an appendix for grade markings was duly approved and designated an American Standard on April 18, At a meeting in February , Subcommittee 2 approved a recommendationto reduce the head heights for heavy, heavy semi-finished, and heavy finished hexagon bolts which was subsequently approved by letter ballot of the B18 Committee on August 16, A proposed standard for heavy hexagon structural bolts submitted and accepted by Subcommittee 2 at its October 17, meeting was approved by letter ballot of the B18 Committee on May 9, , To meet the urgent needs of the steel construction industryit was considered necessary to publish the standard for the structural bolts immediately.
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