Changes

<table borderclass="1" cellspacing="0" style="border-collapse:collapsetwocolortable"><tr><td><p class="s13">Criteria</p></td><td><p class="s13">Form B Form C</p><p class="s13">Trapezoidal head, Trapezoidal head radiused flat</p></td><td><p class="s13">Suggested test</p><p class="s13">equipment</p></td></tr><tr><td><p class="s13">a) Head diameter</p><p class="s13">d<span class="s14">₁ </span>[mm]</p></td><td><p class="s13">During optical measurement disregard corner radius R<span class="s14">₃ </span><u>+</u> 0.1</p></td><td><p class="s13">Comparator, measu-</p><p class="s13">ring microscpope</p></td></tr><tr><td><p class="s13">b) Head thickness</p><p class="s13">k [mm]</p></td><td><p class="s13">+ 0.1</p></td><td><p class="s13">Micrometer,</p><p class="s13">Dial indicator</p></td></tr><tr><td><p class="s13">c) Shank diameter</p><p class="s13">d<span class="s14">₂ </span>[mm]</p></td><td><p class="s13">Deviation from roundness and conical shape of</p><p class="s13">shank only within allowed diameter tolerance d<span class="s14">₂ </span> <u>&lt;</u> 1.5 - 0.08</p><p class="s13">d<span class="s14">₂ </span>&gt; 1.5 - 0.1</p></td><td><p class="s13">Micrometer</p></td></tr><tr><td><p class="s13">d) Shank length l</p><p class="s13">[mm]</p></td><td><p class="s13">+ 0.15</p></td><td><p class="s13">Micrometer, Dial indicator, Comparator</p></td></tr><tr><td><p class="s13">e) Radius at center</p><p class="s13">of contact surface</p><p class="s13">R<span class="s14">₁ </span>[mm]</p></td><td><p class="s13">Form B: <u>+</u> 10%, but not below</p><p class="s15">+<span class="s13"> 0.5 mm</span></p><p class="s13">Form C: Allowable deviation from flatness: convex: within head thickness tolerance concave: 0.005 d<span class="s14">1</span></p></td><td><p class="s13">Comparator, Comparator template, Radius gage, Profile template</p></td></tr><tr><td><p class="s13">f) Radius at edge</p><p class="s13">of contact surface</p><p class="s13">R<span class="s14">₂ </span>[mm]</p></td><td><p class="s13">per DIN 46240: Form B and C max. 0.5 without DIN:max. 1</p></td><td><p class="s13">Profile template,</p><p class="s13">Comparator, Radius gage</p></td></tr><tr><td><p class="s13">g) Radii</p><p class="s13">R<span class="s14">₃ </span>and R<span class="s14">₅ </span>[mm]</p></td><td><p class="s13">Sligth rounding allowed</p></td><td><p class="s13">Comparator</p></td></tr><tr><td><p class="s13">h) Transition radius</p><p class="s13">head underside to shank R<span class="s14">₄ </span>[mm]</p></td><td><p class="s13">d<span class="s14">₂ </span><u>&lt;</u> 2 R<span class="s14">₄ </span><u>&lt;</u> 0.08 d<span class="s14">₂ </span>&gt; 2 R<span class="s14">₄ </span><u>&lt;</u> 0.1 d<span class="s14">₂ </span>&gt; 3 R<span class="s14">₄ </span><u>&lt;</u> 0.2</p></td><td><p class="s13">Comparator, if in doubt: micro-section</p></td></tr><tr><td><p class="s13">i) Allowed deviation from cylindrical shape</p></td><td><p class="s13">d<span class="s14">₁ </span> <u>&lt;</u> 4 up to 7°30’ + 2°30’</p><p class="s13">d<span class="s14">₁ </span>&gt; 4 up to 10° + 5°</p></td><td><p class="s13">Comparator, Measu- ring microscope, if in doubt: microsection</p></td></tr><tr><td><p class="s13">k) Concentricity bet-</p><p class="s13">ween head and shank center line [mm]</p></td><td><p class="s13">5% of d<span class="s14">₁</span></p></td><td><p class="s13">Comparator,</p><p class="s13">Measuring microscope, Special turn fixture</p></td></tr><tr><td><p class="s13">l) Contact layer</p><p class="s13">thickness [mm]</p></td><td><p class="s13">In center area of 0.5 d<span class="s14">₁ </span>s<u>&gt;</u> nominal thickness</p><p class="s13">Remaining head area must be covered</p></td><td><p class="s13">Measuring micros- cope, Microsection</p></td></tr></table>