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Table of Contents 1702 Threads and Threading

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Table of Contents 1702 Threads and Threading TABLE OF CONTENTS THREADS AND THREADING SCREW THREAD SYSTEMS METRIC SCREW THREADS (Cont.) 1706 Screw Thread Forms 1706 Sharp V-thread 1769 Tolerance Grade Comparisons 1706 Unified Screw Thread Forms 1769 M Profile Limiting Dimension 1707 Definitions of Screw Threads 1769 Internal Metric Thread UNIFIED SCREW THREADS 1771 External Metric Thread 1774 Designations 1712 Unified Screw Threads 1777 MJ Profile 1712 Thread Form 1777 Diameter-Pitch Combinations 1713 Internal and External Screw 1779 Trapezoidal Metric Thread Thread Design Profile 1780 Comparison of Maximum Metal 1714 Inch Screw Thread Dimension 1715 Diameter-Pitch Combination MINIATURE AND 1716 Standard Series Combinations 1740 Basic Dimensions INTERFERENCE FIT THREADS 1740 Coarse-Thread Series 1781 Unified Miniature Screw Thread 1741 Fine-Thread Series 1781 Basic Thread Form 1742 Extra-Fine-Thread Series 1782 Design Thread Form 1743 4-Thread Series 1783 Design Form Dimensions 1744 6-Thread Series 1783 Formulas for Basic Dimensions 1745 8-Thread Series 1784 Limits of Size and Tolerances 1746 12-Thread Series 1785 Minimum Root Flats 1747 16-Thread Series 1786 Interference-Fit Threads 1748 20-Thread Series 1787 Design and Application Data 1749 28-Thread Series 1788 External Thread Dimension 1750 Thread Classes 1788 Internal Thread Dimension 1751 Coated 60-deg. Threads 1789 Engagement Lengths 1753 Screw Thread Selection 1790 Allowances for Coarse Thread 1753 Pitch Diameter Tolerance 1790 Tolerances for Coarse Thread 1753 Screw Thread Designation 1791 Variations in Lead and Diameter 1754 Designating Coated Threads 1754 Designating UNS Threads ACME SCREW THREADS 1754 Hole Sizes for Tapping 1754 Minor Diameter Tolerance 1792 Acme Screw Threads 1792 General Purpose Acme Threads METRIC SCREW THREADS 1793 Acme Thread Form 1795 Acme Thread Abbreviations 1755 Metric Screw Threads M Profile 1795 Designation 1755 Comparison with Inch Threads 1796 Basic Dimensions 1755 Interchangeability 1796 Formulas for Diameters 1755 Definitions 1797 Limiting Dimensions 1756 Basic M Profile 1799 Single-Start Screw Thread Data 1756 M Crest and Root Form 1800 Pitch Diameter Allowances 1756 General Symbols 1800 Multiple Start Acme Threads 1757 M Profile Screw Thread Series 1801 Pitch Diameter Tolerances 1757 Mechanical Fastener Coarse Pitch 1802 Centralizing Acme Threads 1758 M Profile Data 1803 Basic Dimensions 1759 Limits and Fits 1804 Formulas for Diameters 1765 Dimensional Effect of Coating 1805 Limiting Dimensions 1765 Formulas for M Profile 1807 Screw Thread Data 1702 TABLE OF CONTENTS ACME SCREW THREADS (Cont.) BRITISH THREADS (Cont.) 1808 Pitch Diameter Allowances 1837 Basic Dimensions 1809 Pitch Diameter Tolerances 1839 British Association Standard 1810 Tolerances and Allowances Thread 1811 Designation 1839 Basic Dimensions 1811 Stub Acme Threads 1839 Tolerance Formulas 1812 Basic Dimensions 1812 Formulas for Diameters OTHER THREADS 1813 Limiting Dimensions 1840 BS Spark Plugs 1814 Stub Acme Thread Designations 1840 SAE Standards Threads 1814 Alternative Stub Acme Threads 1841 Hose Coupling Threads 1816 Acme Centralizing Thread 1842 Screw Thread Length 1816 60-Degree Stub Thread 1842 ANSI Standard BUTTRESS THREADS 1843 Fire Hose Connection 1844 Basic Dimensions 1817 10-Degree Square Thread 1845 Limits of Size 1817 Threads of Buttress Form 1846 Rolled Threads 1818 Buttress Inch Screw Threads 1846 Instrument Makers' System 1818 Basic Dimensions 1846 Pipe Threads 1818 Pitch Combinations 1847 Taper Pipe Thread 1819 Buttress Thread 1847 Limits on Crest and Root 1820 Symbols and Form 1848 Tolerances on Thread Elements 1821 Buttress Thread Tolerances 1848 Pipe Couplings 1822 Class 2 Tolerances 1849 Basic Dimensions 1822 Class 3 Tolerances 1850 Engagement 1823 Allowances for Easy Assembly 1850 Railing Joint 1823 External Thread Allowances 1851 Straight Pipe Threads 1824 Buttress Thread Designations 1851 Mechanical Joints 1824 Designation Sequence 1852 Thread Designation and Notation 1852 Dryseal Pipe Thread BRITISH THREADS 1853 Limits on Crest and Root 1825 British Standard Buttress Threads 1853 Types of Dryseal Pipe Thread 1825 Löwenherz Thread 1854 Limitation of Assembly 1825 International Metric Thread 1855 Tap Drill Sizes 1825 Unified Screw Threads 1855 Special Dryseal Threads 1826 ISO Metric Screw Threads 1856 Limitations for Combinations 1826 Basic Profile Dimensions 1856 Non-pressure-tight Joints 1827 Fundamental Deviations 1857 Basic Sizes 1828 Tolerance Classes for Nuts 1858 Limits of Size 1828 Tolerance Classes for Bolts MEASURING SCREW THREADS 1829 Lengths of Thread Engagements 1831 Limits and Tolerances 1859 Measuring Screw Threads 1834 Diameter/Pitch Combinations 1859 Pitch and Lead of Screw Threads 1836 British Standard Whitworth (BSW) 1859 Thread Micrometers and Fine (BSF) Threads 1860 Ball-point Micrometers 1836 Standard Thread Form 1860 Three-wire Method 1836 Whitworth Standard Thread Form 1861 Classes of Formulas 1836 Tolerance Formulas 1861 Screw Thread Profiles 1861 Checking Pitch Diameters 1703 TABLE OF CONTENTS MEASURING SCREW TAPPING AND THREAD THREADS (Cont.) CUTTING (Cont.) 1862 Wire Sizes 1902 Miniature Screw Threads 1862 Diameters of Wires 1903 Tapping Drill Sizes 1863 Measuring Wire Accuracy 1903 ISO Metric Threads 1863 Measuring or Contact Pressure 1904 Clearance Holes 1863 Three-Wire Formulas 1905 Cold Form Tapping 1864 General Formula 1906 Core Hole Sizes 1864 Notation 1907 Tap Drill Sizes 1865 Formulas for Checking Pitch 1907 Removing a Broken Tap Diameters 1907 Tap Drills for Pipe Taps 1866 Values of Constants 1907 Power for Pipe Taps 1866 Small Thread Angle Affects 1908 High-Speed CNC Tapping 1867 Dimensions Over Wires 1909 Coolant for Tapping 1867 Buckingham Simplified Formula 1909 Combined Drilling and Tapping 1868 Measuring Whitworth Standard 1910 Relief Angles for Cutting Tools 1869 Buckingham Exact Formula 1912 Lathe Change Gears 1870 Accuracy of Formulas 1912 Change Gears for Thread Cutting 1871 Acme and Stub Acme Thread 1912 Compound Gearing 1871 Thickness of Threads 1912 Fractional Threads 1871 Checking Thickness 1913 Change Gears for Metric Pitches 1872 Wire Sizes 1913 Threads per Inch 1872 Testing Angle of Thread 1913 Change Gears for Fractional 1873 Best Wire Diameters Ratios 1875 Taper Screw Threads 1914 Quick-Change Gearbox Output 1876 Buttress Threads 1916 Finding Accurate Gear Ratios 1877 Measurement of Pitch Diameter 1916 Lathe Change-gears 1877 Thread Gage Classification 1917 Relieving Helical-Fluted Hobs 1877 Screw Thread Gage Classification 1877 Unified Inch Screw Threads THREAD ROLLING 1880 Thread Forms of Gages 1918 Thread-Rolling Machine 1880 Thread Gage Tolerances 1918 Flat-Die Type 1882 Tolerance 1918 Cylindrical-Die Type 1883 Tolerances for Cylindrical Gages 1918 Rate of Production 1883 Constants for Thread Gage 1919 Precision Thread Rolling 1884 Formulas for Limits 1919 Steels for Thread Rolling TAPPING AND THREAD 1919 Diameter of Blank CUTTING 1919 Automatic Screw Machines 1920 Factors Governing the Diameter 1885 Selection of Taps 1920 Diameter of Threading Roll 1887 Tap Rake Angles 1920 Kind of Thread on Roll 1887 Cutting Speed 1921 Application of Thread Roll 1887 Tapping Specific Materials 1921 Speeds and Feeds for Thread 1890 Diameter of Tap Drill Rolling 1891 Hole Size Limits 1899 Tap Drill Sizes 1900 Tap Drills and Clearance Drills 1900 Tolerances of Tapped Holes 1901 Hole Sizes before Tapping 1704 TABLE OF CONTENTS THREAD GRINDING SIMPLE, COMPOUND, DIFFERENTIAL, AND 1923 Thread Grinding 1923 Wheels for Thread Grinding BLOCK INDEXING 1923 Single-Edge Wheel 1949 Milling Machine Indexing 1924 Edges for Roughing and Finishing 1949 Hole Circles 1924 Multi-ribbed Wheels 1949 Holes in Brown & Sharpe 1925 Ribbed Wheel for Fine Pitches 1949 Holes in Cincinnati 1925 Solid Grinding Threads 1949 Simple Indexing 1925 Number of Wheel Passes 1950 Compound Indexing 1925 Wheel and Work Rotation 1951 Simple and Compound Indexing 1926 Wheel Speeds 1956 Angular Indexing 1926 Work Speeds 1956 Tables for Angular Indexing 1926 Truing Grinding Wheels 1957 Angular Values of Cincinnati 1927 Wheel Hardness or Grade Index 1927 Grain Size 1958 Accurate Angular Indexing 1927 Grinding by Centerless Method 1976 Indexing for Small Angles THREAD MILLING 1976 Differential Indexing 1977 Ratio of Gearing 1928 Thread Milling Machine 1977 Determining Gear Ratio 1928 Single-cutter Method 1977 To Find the Indexing Movement 1928 Multiple-cutter Method 1977 Use of Idler Gears 1929 Planetary Method 1978 Compound Gearing 1930 Classes of Work 1978 Check Number of Divisions 1930 Pitches of Die-cut Threads 1979 Simple and Different Indexing 1930 Changing Pitch of Screw 1986 Indexing Movements of Plate 1931 Helical Milling 1987 Indexing Movements for High 1931 Lead of a Milling Machine Numbers 1931 Change Gears for Helical Milling 1990 Indexing Tables 1931 Short-lead Milling 1990 Block or Multiple Indexing 1932 Helix 1992 Indexing Movements for 60- 1932 Helix Angles Tooth 1933 Change Gears for Different Leads 1993 Linear Indexing for Rack Cutting 1943 Lead of Helix 1993 Linear Indexing Movements 1946 Change Gears and Angles 1994 Contour Milling 1947 Helix Angle for Given Lead and Diameter 1948 Helix Angle for Given Lead 1948 Lead of Tooth 1948 Helix Angle and Lead 1705 1706 SCREW THREAD SYSTEMS SCREW THREAD SYSTEMS Screw Thread Forms.—Of the various screw thread forms which have been developed, the most used are those having symmetrical sides inclined at equal angles with a vertical center line through the thread apex. Present-day examples of such threads would include the
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