ASME B1.10M:2004 pdf free download

ASME B1.10M:2004 pdf free download.UNIFIED MINIATURE SCREW THREADS.
ASME B1.10M specifies the thread form, series, tolerance, and designation for the Unified Miniature Screw Threads. The series covers a diameter range of 030 mm to 1.40 mm, extending the metric M-Proflle and unified thread series that begin at 1.6 mm.
1.2 UnifIed Miniature Screw Thread Standards
The fourteen sizes published in this Standard were endorsed by the American-British-Canadian conference of April 1955 as the basis of the unified standard among inch-using countries, and to correspond with the range of sizes in the LSO. The sizes are shown in Table 1. In interest of standardization and where design permits. selection of size should be confined to those indicated in bold type in Table I. For more restrictive conditions, those sizes indicated in regular type in Table 1 may be used.
1.3 DesignatIon
Unified Miniature Thread sizes of this series shall be designated on engineering drawings, in specifications, and on tools and gages (space permitting) by their normnal diameter in hundredths of a millimeter followed by the symbol “UNM’ (e.g., 0.80 UNM).
On internal threads, the full limits of minor diametei, as given in Table 2, shall normally be considered appiic:able. Where this is not permissible. the designation shall be supplemented by the minor diameter limits.
1.4 Reference Documents1
The following is a List of publications referenced in this Standard.
ASME BI .7, Nomenclature, Definitions, and Letter Symbols for Screw Threads
ASME 81.3CM. Screw Threads—Standard Practice for Calculating and Rounding Dimensions
PubLisher The American Society of Mechanical Engineers (ASME International), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300
2.6 Classifications
This Standard establishes only one class of thread, with zero allowance on all diameters, in view of the rnanufactunng difficulties which any differentiations in tolerance would impose and because there is no demonstrated need for additional classes.
2.7 Tolerance
2.7.1 All tolerance governing limits of size are based on functions of the pitch only and apply to lengths of engagement from 2, to 1/2 times the nominal diameter. Lengths of engagement and nominal diameter are not incorporated in any of the tolerance formulas in view of the following.
(a) in the small thread sizes covered by this Standard, lengths of engagement significantly below or above the range covered by the formulas are not frequently employed.
(b) Functional fitness in these small sizes is dependent principally upon the properties of the thread rather than the size of the threaded member.
(c) Total tolerance is too small to permit the imposition of minor modifications.