《美国联邦螺丝标准手册》FED-STD-H28

本资料包含pdf文件1个，下载需要5积分

《美国联邦螺丝标准手册》FED-STD-H28INFORMATION SHEET ON FEDERAL STANDARDS
This Federal Standard is issued in loose leaf form to permit the insertion
or removal of new or revised pages and sections.
All Users of Federal Standards should keep them up to date by inserting
revised or new pages as issued and removing superseded and cancelled pages.
New and revised pages will be issued under Change Notices which will be
numbered consecutively and will bear the date of issuance. Change Notices
should be retained and filed in front of the Standard until such time as they
are superseded by a reissue of the entire Standard.
NOTICE
From 1939， the Interdepartmental Screw-Thread Committee (ISTC)， under the
Chairmanship of the National Bureau of Standards (NBS)， Department of
Commerce had developed and published NBS Handbook H28， Screw-Thread Standards
for Federal Services.
Section 487 of Title 40 of the U.S. Code states that the authority for
development of Federal Standards for procurement purposes rests with the
General Services Administration (GSA).
In November 1976， the ISTC was terminated， and the General Services
Administration (GSA) accepted the responsibility for NBS Handbook H28 and
agreed to convert it and maintain it as a Federal Standard.
The standards which had been published as NBS Handbook H28， Part 1， Part
II and Part III will now be promulgated as a fully coordinated FED-STD-H28，
maintaining the existing sections and identifying them with slant lines. For
example， NBS Handbook H28， Part 1， Section 3 will be detailed standard