{"id":130,"date":"2024-07-12T06:23:16","date_gmt":"2024-07-12T06:23:16","guid":{"rendered":"https:\/\/www.loyal.sg\/blog\/tolerance-symbols.html"},"modified":"2024-07-15T07:19:46","modified_gmt":"2024-07-15T07:19:46","slug":"tolerance-symbols","status":"publish","type":"post","link":"https:\/\/www.loyal.sg\/article\/s91\/tolerance-symbols.html","title":{"rendered":"Tolerance symbols"},"content":{"rendered":"<table>\n<tbody>\n<tr class=\"thin-table-border\">\n<td valign=\"top\"><strong>Tolerance<br \/>\n<br \/>\nsymbol<\/strong><\/td>\n<td valign=\"top\"><strong>Definition<\/strong><\/td>\n<\/tr>\n<tr class=\"thick-table-border\">\n<td><\/td>\n<td><strong>Radial bearings inner ring &#8211; cylindrical and tapered bore<\/strong><\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr>\n<td><strong>d<\/strong><\/td>\n<td>\n<ol>\n<li><span>Cylindrical bore: Nominal bore diameter<\/span><\/li>\n<li><span>Tapered bore: Nominal bore diameter at the theoretical small end<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394dmp<\/strong><\/td>\n<td>\n<ol>\n<li><span>Cylindrical bore: Deviation of a mid-range size (out of two-point sizes) of bore diameter in any cross section from its nominal size<\/span><\/li>\n<li><span>Tapered bore: Deviation of a mid-range size (out of two-point sizes) of bore diameter at the theoretical small end from its nominal size<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394ds<\/strong><\/td>\n<td>Deviation of a two-point size of bore diameter of a cylindrical bore from its nominal size<\/td>\n<\/tr>\n<tr>\n<td><strong>Vdsp<\/strong><\/td>\n<td>Range of two-point sizes of bore diameter in any cross section of a cylindrical or tapered bore<\/td>\n<\/tr>\n<tr>\n<td><strong>Vdmp<\/strong><\/td>\n<td>Range of mid-range sizes (out of two-point sizes) of bore diameter obtained from any cross section of a cylindrical bore<\/td>\n<\/tr>\n<tr>\n<td><strong>B<\/strong><\/td>\n<td>Nominal inner ring width<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">\n<strong>\u0394Bs<\/strong><br \/>\nNormal,<br \/>\n<br \/>\nModified<sup>1)<\/sup>\n<\/td>\n<td>\n<ol>\n<li><span>Symmetrical rings: Deviation of a two-point size of inner ring width from its nominal size<\/span><\/li>\n<li><span>Asymmetrical rings, upper limit: Deviation of a minimum circumscribed size of inner ring width, between two opposite lines, in any lo<em><\/em>ngitudinal section which includes the inner ring bore axis, from its nominal size<\/span><\/li>\n<li><span>Asymmetrical rings, lower limit: Deviation of a two-point size of inner ring width from its nominal size<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\"><strong>VBs<\/strong><\/td>\n<td>\n<ol>\n<li><span>Symmetrical rings: Range of two-point sizes of inner ring width<\/span><\/li>\n<li><span>Asymmetrical rings: Range of minimum circumscribed sizes of inner ring width, between two opposite lines, obtained from any lo<em><\/em>ngitudinal section which includes the inner ring bore axis<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<strong>Kia<\/strong><sup>4)<\/sup>\n<\/td>\n<td>Circular radial run-out of inner ring bore surface of assembled bearing with respect to datum, i.e. axis, established from the outer ring outside surface<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Sd<\/strong><sup>4)<\/sup><\/p>\n<\/td>\n<td>Circular axial run-out of inner ring face with respect to datum, i.e. axis, established from the inner ring bore surface<\/td>\n<\/tr>\n<tr>\n<td>\n<strong>Sia<\/strong><sup>4)<\/sup>\n<\/td>\n<td>Circular axial run-out of inner ring face of assembled bearing with respect to datum, i.e. axis, established from the outer ring outside surface<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thin-table-border\">\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr class=\"thick-table-border\">\n<td><\/td>\n<td><strong>Radial bearings inner ring &#8211; tapered bore only<\/strong><\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr>\n<td><strong>d<sub>1<\/sub><\/strong><\/td>\n<td>Nominal bore diameter at the theoretical large end of a tapered bore<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394d1mp<\/strong><\/td>\n<td>Deviation of a mid-range size (out of two-point sizes) of bore diameter at the theoretical large end from its nominal size<\/td>\n<\/tr>\n<tr>\n<td><strong>SL<\/strong><\/td>\n<td>Taper slope, the difference between nominal diameters at the theoretical large end and small end of a tapered bore (d<sub>1<\/sub> &#8211; d)<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394SL<\/strong><\/td>\n<td>Deviation of taper slope of a tapered inner ring bore from its nominal size<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thin-table-border\">\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thick-table-border\">\n<td><\/td>\n<td><strong>Radial bearings outer ring<\/strong><\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr>\n<td><strong>D<\/strong><\/td>\n<td>Nominal outside diameter<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394Dmp<\/strong><\/td>\n<td>Deviation of a mid-range size (out of two-point sizes) of outside diameter in any cross section from its nominal size<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394Ds<\/strong><\/td>\n<td>Deviation of a two-point size of outside diameter from its nominal size<\/td>\n<\/tr>\n<tr>\n<td><strong>VDsp<\/strong><\/td>\n<td>Range of two-point sizes of outside diameter in any cross section<\/td>\n<\/tr>\n<tr>\n<td><strong>VDmp<\/strong><\/td>\n<td>Range of mid-range sizes (out of two-point sizes) of outside diameter obtained from any cross section<\/td>\n<\/tr>\n<tr>\n<td><strong>C<\/strong><\/td>\n<td>Nominal outer ring width<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\">\n<strong>\u0394Cs<\/strong><br \/>\nNormal,<br \/>\n<br \/>\nModified<sup>1)<\/sup>\n<\/td>\n<td>\n<ol>\n<li><span>Symmetrical rings: Deviation of a two-point size of outer ring width from its nominal size<\/span><\/li>\n<li><span>Asymmetrical rings, upper limit: Deviation of a minimum circumscribed size of outer ring width, between two opposite lines, in any lo<em><\/em>ngitudinal section which includes the outer ring outside surface axis, from its nominal size<\/span><\/li>\n<li><span>Asymmetrical rings, lower limit: Deviation of a two-point size of outer ring width from its nominal size<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\"><strong>VCs<\/strong><\/td>\n<td>\n<ol>\n<li><span>Symmetrical rings: Range of two-point sizes of outer ring width<\/span><\/li>\n<li><span>Asymmetrical rings: Range of minimum circumscribed sizes of outer ring width, between two opposite lines, obtained from any lo<em><\/em>ngitudinal section which includes the outer ring outside surface axis<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<strong>Kea<\/strong><sup>4)<\/sup>\n<\/td>\n<td>Circular radial run-out of outer ring outside surface of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface<\/td>\n<\/tr>\n<tr>\n<td>\n<strong>SD<\/strong><sup>4)<\/sup>\n<\/td>\n<td>Perpendicularity of outer ring outside surface axis with respect to datum established from the outer ring face<\/td>\n<\/tr>\n<tr>\n<td>\n<strong>Sea<\/strong><sup>4)<\/sup>\n<\/td>\n<td>Circular axial run-out of outer ring face of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thin-table-border\">\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thick-table-border\">\n<td><\/td>\n<td><strong>Chamfer limits<\/strong><\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr>\n<td><strong>r<sub>s<\/sub><\/strong><\/td>\n<td>Single chamfer dimension<\/td>\n<\/tr>\n<tr>\n<td><strong>r<sub>s min<\/sub><\/strong><\/td>\n<td>Smallest single chamfer dimension of r<sub>s<\/sub>, r<sub>1<\/sub>, r<sub>2<\/sub>, r<sub>3<\/sub>, r<sub>4<\/sub> \u2026<\/td>\n<\/tr>\n<tr>\n<td><strong>r<sub>1<\/sub>, r<sub>3<\/sub><\/strong><\/td>\n<td>Radial direction chamfer dimensions<\/td>\n<\/tr>\n<tr>\n<td><strong>r<sub>2<\/sub>, r<sub>4<\/sub><\/strong><\/td>\n<td>Axial direction chamfer dimensions<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thin-table-border\">\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thick-table-border\">\n<td><\/td>\n<td><strong>Tapered roller bearings<\/strong><\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr>\n<td><strong>T<\/strong><\/td>\n<td>Nominal assembled bearing width<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394Ts<\/strong><\/td>\n<td>Deviation of minimum circumscribed size of assembled bearing width from its nominal size<\/td>\n<\/tr>\n<tr>\n<td><strong>T<sub>1<\/sub><\/strong><\/td>\n<td>Nominal effective width of cone (inner ring, with roller and cage assembly) assembled with a master cup (outer ring)<\/td>\n<\/tr>\n<tr>\n<td><strong>T<sub>2<\/sub><\/strong><\/td>\n<td>Nominal effective width of cup assembled with a master cone<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394T1s<\/strong><\/td>\n<td>Deviation of minimum circumscribed size of effective width (cone assembled with a master cup) from its nominal size<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394T2s<\/strong><\/td>\n<td>Deviation of minimum circumscribed size of effective width (cup assembled with a master cone) from its nominal size<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thin-table-border\">\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thick-table-border\">\n<td><\/td>\n<td><strong>Thrust bearings shaft washer<\/strong><\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr>\n<td><strong>d<\/strong><\/td>\n<td>Nominal bore diameter of shaft washer, single direction bearing<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394ds<\/strong><\/td>\n<td>Deviation of a two-point size of shaft washer bore diameter from its nominal size<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394dmp<\/strong><\/td>\n<td>Deviation of a mid-range size (out of two-point sizes) of shaft washer bore diameter in any cross section from its nominal size<\/td>\n<\/tr>\n<tr>\n<td><strong>Vdsp<\/strong><\/td>\n<td>Range of two-point sizes of shaft washer bore diameter in any cross section<\/td>\n<\/tr>\n<tr>\n<td><strong>d<sub>2<\/sub><\/strong><\/td>\n<td>Nominal bore diameter of central shaft washer, double direction bearing<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394d2mp<\/strong><\/td>\n<td>Deviation of a mid-range size (out of two-point sizes) of central shaft washer bore diameter in any cross section from its nominal size<\/td>\n<\/tr>\n<tr>\n<td><strong>Vd2sp<\/strong><\/td>\n<td>Range of two-point sizes of central shaft washer bore diameter in any cross section<\/td>\n<\/tr>\n<tr>\n<td><strong>Si<\/strong><\/td>\n<td>\n<ol>\n<li><span>Range of two-point sizes of thickness between shaft washer raceway and the back face, cylindrical roller thrust bearing<\/span><\/li>\n<li><span>Range of minimum spherical sizes between the raceway and the opposite back face of the shaft washer, obtained from any lo<em><\/em>ngitudinal section which includes the shaft washer bore axis, thrust ball bearing<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thin-table-border\">\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thick-table-border\">\n<td><\/td>\n<td><strong>Thrust bearings housing washer<\/strong><\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr>\n<td><strong>D<\/strong><\/td>\n<td>Nominal outside diameter of housing washer<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394Ds<\/strong><\/td>\n<td>Deviation of a two-point size of housing washer outside diameter from its nominal size<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394Dmp<\/strong><\/td>\n<td>Deviation of a mid-range size (out of two-point sizes) of housing washer outside diameter in any cross section from its nominal size<\/td>\n<\/tr>\n<tr>\n<td><strong>VDsp<\/strong><\/td>\n<td>Range of two-point sizes of housing washer outside diameter in any cross section<\/td>\n<\/tr>\n<tr>\n<td><strong>Se<\/strong><\/td>\n<td>\n<ol>\n<li><span>Range of two-point sizes of thickness between housing washer raceway and the back face, cylindrical roller thrust bearing<\/span><\/li>\n<li><span>Range of minimum spherical sizes between the raceway and the opposite back face of the housing washer, obtained from any lo<em><\/em>ngitudinal section which includes the housing washer outside surface axis, thrust ball bearing<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thin-table-border\">\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr class=\"thick-table-border\">\n<td><\/td>\n<td><strong>Thrust bearings assembled bearing height<\/strong><\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\">\u00a0<\/td>\n<\/tr>\n<tr>\n<td><strong>T<\/strong><\/td>\n<td>Nominal assembled bearing height, single direction thrust bearing (except spherical roller thrust bearing \u2192 T<sub>4<\/sub>)<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394Ts<\/strong><\/td>\n<td>Deviation of minimum circumscribed size of assembled bearing height from its nominal size, single direction thrust bearing (except spherical roller thrust bearing \u2192 \u0394T4s)<\/td>\n<\/tr>\n<tr>\n<td><strong>T<sub>1<\/sub><\/strong><\/td>\n<td>\n<ol>\n<li><span>Nominal assembled bearing height, double direction thrust bearing<\/span><\/li>\n<li><span>Nominal assembled bearing height, single direction thrust bearing with a seat washer<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0394T1s<\/strong><\/td>\n<td>\n<ol>\n<li><span>Deviation of minimum circumscribed size of assembled bearing height from its nominal size, double direction thrust bearing<\/span><\/li>\n<li><span>Deviation of minimum circumscribed size of assembled bearing height from its nominal size, single direction thrust bearing with a seat washer<\/span><\/li>\n<\/ol>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<strong>T<sub>3<\/sub><\/strong><sup>2)<\/sup>\n<\/td>\n<td>Nominal assembled bearing height, double direction thrust bearing with seat washers<\/td>\n<\/tr>\n<tr>\n<td>\n<strong>\u0394T3s<\/strong><sup>2)<\/sup>\n<\/td>\n<td>Deviation of minimum circumscribed size of assembled bearing height from its nominal size, double direction thrust bearing with seat washers<\/td>\n<\/tr>\n<tr>\n<td>\n<strong>T<sub>4<\/sub><\/strong><sup>3)<\/sup>\n<\/td>\n<td>Nominal assembled bearing height, spherical roller thrust bearing<\/td>\n<\/tr>\n<tr>\n<td>\n<strong>\u0394T4s<\/strong><sup>3)<\/sup>\n<\/td>\n<td>Deviation of minimum circumscribed size of assembled bearing height from its nominal size, spherical roller thrust bearing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ol class=\"footnotes\">\n<li class=\"clearfix\">\n<strong class=\"footnote\">1)<\/strong><br \/>\n\t\t\t\t\t\t<span>Modified applies to inner rings and outer rings of bearings of matched bearing sets co<em><\/em>nsisting of two or more bearings. Does not apply to universally matchable angular co<em><\/em>ntact ball bearings.<\/span>\n<\/li>\n<li class=\"clearfix\">\n<strong class=\"footnote\">2)<\/strong><br \/>\n\t\t\t\t\t\t<span>Not included in ISO\u00a0199.<\/span>\n<\/li>\n<li class=\"clearfix\">\n<strong class=\"footnote\">3)<\/strong><br \/>\n\t\t\t\t\t\t<span>In ISO\u00a0199, the symbol T is used.<\/span>\n<\/li>\n<li class=\"clearfix\">\n<strong class=\"footnote\">4)<\/strong><br \/>\n\t\t\t\t\t\t<span>Geometrical tolerances<br \/>\n<br \/><\/span>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>TolerancesymbolDefinitionRadial bearings inner ring &#8211; cylindrical and tapered bore\u00a0dCylindrical bore: Nominal bore diameterTapered bore: Nominal bore diameter at the theoretical small end\u0394dmpCylindrical bore: Deviation of a mid-range size (out of t<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-130","post","type-post","status-publish","format-standard","hentry","category-technical"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.5 (Yoast SEO v23.0) - 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