{"id":2339,"date":"2025-09-29T11:54:18","date_gmt":"2025-09-29T02:54:18","guid":{"rendered":"https:\/\/www.sungilfa.co.kr\/?page_id=2339"},"modified":"2026-02-03T19:00:59","modified_gmt":"2026-02-03T10:00:59","slug":"selection-and-design-guide","status":"publish","type":"page","link":"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/selection-and-design-guide\/","title":{"rendered":"Selection and Design Guide"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container has-pattern-background has-mask-background fusion-parallax-none subtop prosubtop nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-top:30px;--awb-padding-bottom:30px;--awb-margin-bottom:0px;--awb-min-height:370px;--awb-background-image:url(&quot;http:\/\/www.sungilfa.co.kr\/wp-content\/uploads\/2025\/11\/aplock_bg.jpg&quot;);--awb-background-size:cover;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1497.6px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-1\"><div class=\"subtoptitle\">\n<h3>A.P. LOCK<br \/>\n<span class=\"sotxt\">(Keyless Bushing)<\/span><\/h3>\n<div class=\"subbgline\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2025\/11\/Line-3.png\" \/><\/div>\n<p>A.P. Lock (Keyless Bushing) is a power transmission component that<br \/>\nenables to clamp shaft and hubs (i.e. pulley, gear etc.) simultaneously<br \/>\nthrough its surface pressure. S.I.M provides diverse options in regards<br \/>\nto size, body material and surface treatment.<\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-top:40px;--awb-padding-bottom:70px;--awb-margin-bottom:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1497.6px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 awb-sticky awb-sticky-small awb-sticky-medium awb-sticky-large fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-2\"><div class=\"pro_top aptop\">\n<ul>\n<li><a href=\"\/en\/products\/aplock\">INDEX (A.P.LOCK)?<\/a><\/li>\n<li><a href=\"\/en\/products\/aplock\/selection-and-design-guide\">Selection and Design Guide<\/a><\/li>\n<li class=\"longtabli\"><a href=\"\/en\/products\/aplock\/how-to-install1\">HOW TO INSTALL<br \/>\n(SAPL-A, B,C, D1, D2, D3, D4, E, T Series)<\/a><\/li>\n<li><a href=\"\/en\/products\/aplock\/how-to-install2\">HOW TO INSTALL (SAPL-R)<\/a><\/li>\n<li><a href=\"\/en\/products\/aplock\/how-to-install3\">HOW TO INSTALL (SAPC, SAPA)<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 awb-sticky awb-sticky-small awb-sticky-medium awb-sticky-large fusion_builder_column_1_4 1_4 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:25%;--awb-margin-top-large:0px;--awb-spacing-right-large:7.68%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:7.68%;--awb-width-medium:25%;--awb-order-medium:0;--awb-spacing-right-medium:7.68%;--awb-spacing-left-medium:7.68%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;--awb-sticky-offset:200px;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-widget-area awb-widget-area-element fusion-widget-area-1 fusion-content-widget-area\" style=\"--awb-title-color:#000000;--awb-padding:0px 0px 0px 0px;\"><style type=\"text\/css\" data-id=\"avada-vertical-menu-widget-9\">#avada-vertical-menu-widget-9 > ul.menu { margin-top: -8px; }<\/style><div id=\"avada-vertical-menu-widget-9\" class=\"widget avada_vertical_menu\" style=\"border-style: solid;border-color:transparent;border-width:0px;\"><style>#fusion-vertical-menu-widget-avada-vertical-menu-widget-9-nav ul.menu li a {font-size:16px;}<\/style><nav id=\"fusion-vertical-menu-widget-avada-vertical-menu-widget-9-nav\" class=\"fusion-vertical-menu-widget fusion-menu hover left no-border\" aria-label=\"Secondary Navigation: \"><ul id=\"menu-a-p-lock\" class=\"menu\"><li id=\"menu-item-2337\" class=\"toppromenu menu-item menu-item-type-post_type menu-item-object-page menu-item-2337\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/\"><span class=\"link-text\"> A.P. LOCK <span class=\"desc\">(Keyless Bushing)<\/span><\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2459\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2459\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapl-a\/\"><span class=\"link-text\"> SAPL-A Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2595\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2595\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapl-b\/\"><span class=\"link-text\"> SAPL-B Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2602\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2602\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapl-c\/\"><span class=\"link-text\"> SAPL-C Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2718\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2718\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapl-d1\/\"><span class=\"link-text\"> SAPL-D1 Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2748\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2748\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapl-d2\/\"><span class=\"link-text\"> SAPL-D2 Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2755\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2755\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapl-d3\/\"><span class=\"link-text\"> SAPL-D3 Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2784\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2784\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapl-d4\/\"><span class=\"link-text\"> SAPL-D4 Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2819\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2819\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapl-e\/\"><span class=\"link-text\"> SAPL-E Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2853\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2853\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapl-t\/\"><span class=\"link-text\"> SAPL-T Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2894\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2894\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapl-r\/\"><span class=\"link-text\"> SAPL-R Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2935\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2935\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapc\/\"><span class=\"link-text\"> SAPC Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-2975\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-2975\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/aplock\/sapa\/\"><span class=\"link-text\"> SAPA Series<\/span><span class=\"arrow\"><\/span><\/a><\/li><li id=\"menu-item-1967\" class=\"gobackmenu menu-item menu-item-type-post_type menu-item-object-page menu-item-1967\"><a href=\"https:\/\/www.sungilfa.co.kr\/en\/products\/\"><span class=\"link-text\"> Go back to [Main Products]<\/span><span class=\"arrow\"><\/span><\/a><\/li><\/ul><\/nav><\/div><div class=\"fusion-additional-widget-content\"><\/div><\/div><div class=\"custom-select\">\n  <select onchange=\"window.open(value,'_self');\">\n    <option value=\"0\">A.P. LOCK (Keyless Bushing)<\/option>\n    <option value=\"\/en\/products\/aplock\/\">A.P. LOCK (Keyless Bushing)<\/option>\n    <option value=\"\/en\/products\/aplock\/sapl-a\">SAPL-A Series<\/option>\n    <option value=\"\/en\/products\/aplock\/sapl-b\">SAPL-B Series<\/option>\n    <option value=\"\/en\/products\/aplock\/sapl-c\">SAPL-C Series<\/option>\n    <option value=\"\/en\/products\/aplock\/sapl-d1\">SAPL-D1 Series<\/option>\n    <option value=\"\/en\/products\/aplock\/sapl-d2\">SAPL-D2 Series<\/option>\n    <option value=\"\/en\/products\/aplock\/sapl-d3\">SAPL-D3 Series<\/option>\n    <option value=\"\/en\/products\/aplock\/sapl-d4\">SAPL-D4 Series<\/option>\n    <option value=\"\/en\/products\/aplock\/sapl-e\">SAPL-E Series<\/option>\n    <option value=\"\/en\/products\/aplock\/sapl-t\">SAPL-T Series<\/option>\n    <option value=\"\/en\/products\/aplock\/sapl-r\">SAPL-R Series<\/option>\n    <option value=\"\/en\/products\/aplock\/sapc\">SAPC Series<\/option>\n    <option value=\"\/en\/products\/aplock\/sapa\">SAPA Series<\/option>\n <option value=\"\/en\/products\">Go back to [Main Products]<\/option>\n  <\/select>\n<\/div>\n<\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-3 awb-sticky awb-sticky-small awb-sticky-medium awb-sticky-large fusion_builder_column_3_4 3_4 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:75%;--awb-margin-top-large:0px;--awb-spacing-right-large:2.56%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:2.56%;--awb-width-medium:75%;--awb-order-medium:0;--awb-spacing-right-medium:2.56%;--awb-spacing-left-medium:2.56%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-3\"><div class=\"subtitle\">\n<h3>A.P.Lock &#8211; Selection and Design Guide<\/h3>\n<\/div>\n<\/div><div class=\"fusion-text fusion-text-4\"><div class=\"toplinetxt notoplinetxt aptoplinetxt\">\n<h5>Calculation of a Motor\u2019s Max. Torque<\/h5>\n<p>Maximum torque is calculated by motor\u2019s rotational speed(rpm), output power and reduction ratio etc. The safety factor (in the below table) has to be considered by all means in case motor\u2019s torque information is not available.\n<\/p>\n<\/div>\n<\/div><div class=\"mathbox\">\n<span class=\"MJX_Assistive_MathML\" role=\"presentation\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><msub><mi>T<\/mi><mrow><mi>m<\/mi><mi>a<\/mi><mi>x<\/mi><\/mrow><\/msub><mo>=<\/mo><mfrac><mrow><mn>9554<\/mn><mo>\u00d7<\/mo><msub><mi>P<\/mi><mrow><mi>m<\/mi><mi>a<\/mi><mi>x<\/mi><\/mrow><\/msub><\/mrow><mrow><mi>N<\/mi><mo>\u00d7<\/mo><mi>i<\/mi><\/mrow><\/mfrac><mo>\u00d7<\/mo><mi>S<\/mi><mi>F<\/mi><\/math><\/span>\n<\/div>\n<script type=\"math\/mml\" id=\"MathJax-Element-1\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><msub><mi>T<\/mi><mrow><mi>m<\/mi><mi>a<\/mi><mi>x<\/mi><\/mrow><\/msub><mo>=<\/mo><mfrac><mrow><mn>9554<\/mn><mo>\u00d7<\/mo><msub><mi>P<\/mi><mrow><mi>m<\/mi><mi>a<\/mi><mi>x<\/mi><\/mrow><\/msub><\/mrow><mrow><mi>N<\/mi><mo>\u00d7<\/mo><mi>i<\/mi><\/mrow><\/mfrac><mo>\u00d7<\/mo><mi>S<\/mi><mi>F<\/mi><\/math><\/script><div class=\"fusion-text fusion-text-5\"><div class=\"selfguid2red envul apullist\">\n<ul class=\"has-l-style halful\">\n<li>T<sub>max<\/sub> = Max. Motor Torque [N\u318dm]<\/li>\n<li>P<sub>max<\/sub> = Max. Output Power [kW]<\/li>\n<li>N = Rotational Speed [rpm]<\/li>\n<li>i = Gear Reduction Ratio<\/li>\n<li>SF = Safety Factor<\/li>\n<\/ul>\n<\/div>\n<\/div><div class=\"fusion-separator fusion-full-width-sep spacebar\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><div class=\"fusion-text fusion-text-6\"><div class=\"toplinetxt greynormaltable\">\n<table class=\"type2\">\n<thead>\n<tr>\n<th colspan=\"2\">Load Conditions<\/th>\n<th>Safety Factor  (SF)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Low Inertia<\/td>\n<td>At 60% (or less) of motor\u2019s rated torque<\/td>\n<td>1.5~2.0<\/td>\n<\/tr>\n<tr>\n<td>Medium Inertia<\/td>\n<td>Longer acceleration\/deceleration time, limited reverse motion and small impact<\/td>\n<td>2.0~3.0<\/td>\n<\/tr>\n<tr>\n<td>High Inertia<\/td>\n<td>Shorter acceleration\/deceleration time, frequent reverse motion and large impact<\/td>\n<td>3.0~5.0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div><div class=\"mathbox\">\n<h6>T<sub>max<\/sub> (Max. Motor Torque) < T<sub>c<\/sub> (Max. Permissible Torque of A.P. Lock)<\/h6>\n<\/div>\n<p>Max. motor torque (with SF applied) must be lower than max. permissible torque of A.P. Lock.<\/p><div class=\"fusion-separator fusion-full-width-sep spacebar\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:25px;margin-bottom:25px;width:100%;\"><\/div><div class=\"fusion-text fusion-text-7\"><div class=\"toplinetxt notoplinetxt aptoplinetxt\">\n<h5>Thrust Load<\/h5>\n<\/div>\n<\/div><div class=\"mathbox\">\n<h6>P (Max. Thrust Load) < Pt (Max. Permissible Thrust Load of A.P. Lock)<\/h6>\n<\/div>\n<p>The thrust load on A.P. Lock\u2019s fastening area must be lower than max. permissible thrust load of A.P. Lock.<\/p><div class=\"fusion-separator fusion-full-width-sep spacebar\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:25px;margin-bottom:25px;width:100%;\"><\/div><div class=\"fusion-text fusion-text-8\"><div class=\"toplinetxt notoplinetxt aptoplinetxt\">\n<h5>Combined Torque and Thrust Load<\/h5>\n<p>If torque and thrust load occur simultaneously, please refer to the below formula for load calculation.\n<\/p>\n<\/div>\n<\/div><div class=\"mathbox\">\n<img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/02\/math1-1.jpg\">\n<\/div>\n<div class=\"fusion-text fusion-text-9\"><div class=\"selfguid2red envul apullist\">\n<ul class=\"has-l-style halful\">\n<li>T<sub>comb<\/sub> = Combined Load [N\u318dm]<\/li>\n<li>P<sub>max<\/sub> = Max. Motor Output Power [KW]<\/li>\n<li>N = Rotational Speed [rpm]<\/li>\n<li>d = Shaft Diameter[mm]<\/li>\n<li>P = Thrust Load[N]<\/li>\n<li>SF = Safety Factor<\/li>\n<\/ul>\n<\/div>\n<\/div><div class=\"fusion-separator fusion-full-width-sep spacebar\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:15px;margin-bottom:15px;width:100%;\"><\/div><div class=\"mathbox\">\n<h6>T<sub>comb<\/sub> (Combined Load) < T<sub>c<\/sub> (Max. Permissible Torque of A.P. Lock)<\/h6>\n<\/div>\n<p>Combined Load of torque and thrust must be lower than max. permissible torque of A.P. Lock.<\/p><div class=\"fusion-separator fusion-full-width-sep spacebar\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:25px;margin-bottom:25px;width:100%;\"><\/div><div class=\"fusion-text fusion-text-10\"><div class=\"toplinetxt notoplinetxt aptoplinetxt\">\n<h5>Permissible Torque Variation<\/h5>\n<\/div>\n<div class=\"numli\">\n<ol>\n<li><strong>Permissible Torque Increase<\/strong><br \/>When several A.P. Locks are used together, permissible torque and thrust load gets increased. <br \/>\u203b Make sure all foreign substances must be removed from surface of the both shaft and inner part of A.P. Lock. <\/li>\n<li><strong>Permissible Torque Decrease<\/strong><br \/>When the shaft has an additional keyway, permissible torque would be decreased by appx. 20% due to reduced contact area.<\/li>\n<\/ol>\n<\/div>\n<\/div><div class=\"fusion-separator fusion-full-width-sep spacebar\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:25px;margin-bottom:25px;width:100%;\"><\/div><div class=\"fusion-text fusion-text-11\"><div class=\"toplinetxt notoplinetxt aptoplinetxt\">\n<h5>Shaft Design Guide<\/h5>\n<\/div>\n<div class=\"numli\">\n<ol>\n<li>Please refer to each overview pages for shaft tolerance.\n<\/li>\n<li>Check the strength of shaft\u2019s raw material.<\/li>\n<\/ol>\n<\/div>\n<\/div><div class=\"fusion-builder-row fusion-builder-row-inner fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"width:104% !important;max-width:104% !important;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column_inner fusion-builder-nested-column-0 fusion_builder_column_inner_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:3.84%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"mathbox\">\n<span class=\"MJX_Assistive_MathML\" role=\"presentation\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><msub><mi>\u03c3<\/mi><mi>s<\/mi><\/msub><mo>><\/mo><mn>1<\/mn><mo>.<\/mo><mn>2<\/mn><mo>\u00d7<\/mo><msub><mi>P<\/mi><mi>i<\/mi><\/msub><\/math><\/span>\n<\/div>\n<script type=\"math\/mml\" id=\"MathJax-Element-3\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><msub><mi>\u03c3<\/mi><mi>s<\/mi><\/msub><mo>><\/mo><mn>1<\/mn><mo>.<\/mo><mn>2<\/mn><mo>\u00d7<\/mo><msub><mi>P<\/mi><mi>i<\/mi><\/msub><\/math><\/script><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column_inner fusion-builder-nested-column-1 fusion_builder_column_inner_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:3.84%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-12\"><div class=\"selfguid2red envul apullist\">\n<ul class=\"has-l-style\">\n<li>\u03c3<sub>s<\/sub> : Yield stress of shaft\u2019s raw material [Mpa]<\/li>\n<li>P<sub>i<\/sub> : Surface pressure onto shaft by A.P. Lock [Mpa]<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div><\/div><\/div><div class=\"fusion-text fusion-text-13\"><div class=\"numli\">\n<ol>\n<li style=\"margin-left:0!important; list-style:none!Important;\">3. Determine max. inner diameter of hollow shaft.<br \/>\nHigh surface pressure is delivered on the shaft. Thus, make sure the below formula is referred when the hollow shaft is designed.<\/li>\n<\/ol>\n<\/div>\n<\/div><div class=\"fusion-builder-row fusion-builder-row-inner fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"width:104% !important;max-width:104% !important;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column_inner fusion-builder-nested-column-2 fusion_builder_column_inner_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:3.84%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"mathbox\">\n<img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/02\/math1-2.jpg\">\n<\/div>\n<\/div><\/div><div class=\"fusion-layout-column fusion_builder_column_inner fusion-builder-nested-column-3 fusion_builder_column_inner_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:3.84%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-14\"><div class=\"selfguid2red envul apullist\">\n<ul class=\"has-l-style\">\n<li>d<sub>i<\/sub> : Inner dia. of hollow shaft<\/li>\n<li>d : Outer dia. of hollow shaft<\/li>\n<li>\u03c3<sub>s<\/sub> : Yield stress of shaft\u2019s raw material [Mpa]<\/li>\n<li>P<sub>i<\/sub> : Surface Pressure onto Shaft by A.P. Lock [Mpa]<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div><\/div><\/div><div class=\"fusion-separator fusion-full-width-sep spacebar\" style=\"align-self: center;margin-left: auto;margin-right: auto;margin-top:25px;margin-bottom:25px;width:100%;\"><\/div><div class=\"fusion-text fusion-text-15\"><div class=\"toplinetxt notoplinetxt aptoplinetxt\">\n<h5>Hub Design Guide<\/h5>\n<\/div>\n<div class=\"numli\">\n<ol>\n<li>Please refer to each overview pages for hub tolerance.<\/li>\n<li>Check the strength of hub\u2019s raw material.<\/li>\n<\/ol>\n<\/div>\n<\/div><div class=\"fusion-builder-row fusion-builder-row-inner fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"width:104% !important;max-width:104% !important;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column_inner fusion-builder-nested-column-4 fusion_builder_column_inner_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:3.84%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"mathbox\">\n<span class=\"MJX_Assistive_MathML\" role=\"presentation\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><msub><mi>\u03c3<\/mi><mi>h<\/mi><\/msub><mo>><\/mo><mn>1<\/mn><mo>.<\/mo><mn>2<\/mn><mo>\u00d7<\/mo><msub><mi>P<\/mi><mi>o<\/mi><\/msub><\/math><\/span>\n<\/div>\n<script type=\"math\/mml\" id=\"MathJax-Element-5\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><msub><mi>\u03c3<\/mi><mi>h<\/mi><\/msub><mo>><\/mo><mn>1<\/mn><mo>.<\/mo><mn>2<\/mn><mo>\u00d7<\/mo><msub><mi>P<\/mi><mi>o<\/mi><\/msub><\/math><\/script><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column_inner fusion-builder-nested-column-5 fusion_builder_column_inner_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:3.84%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-16\"><div class=\"selfguid2red envul apullist\">\n<ul class=\"has-l-style\">\n<li>\u03c3<sub>h<\/sub> : Yield stress of hub\u2019s raw material [Mpa]<\/li>\n<li>P<sub>o<\/sub> : Surface pressure onto hub by A.P. Lock [Mpa]<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div><\/div><\/div><div class=\"fusion-text fusion-text-17\"><div class=\"numli\">\n<ol>\n<li style=\"margin-left:0!important; list-style:none!Important;\">3. Check the min. hub outer diameter.<br \/>\nYou may refer to the below formula in case the material information is not available.<\/li>\n<\/ol>\n<\/div>\n<\/div><div class=\"fusion-builder-row fusion-builder-row-inner fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"width:104% !important;max-width:104% !important;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column_inner fusion-builder-nested-column-6 fusion_builder_column_inner_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:3.84%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"mathbox\">\n<img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/02\/math1-3.jpg\">\n<\/div>\n<div class=\"fusion-text fusion-text-18\"><div class=\"selfguid2red envul apullist\">\n<ul class=\"has-l-style\">\n<li>D<sub>o<\/sub> : Outer dia. of hub [mm]<\/li>\n<li>D<sub>i<\/sub> : Inner dia. of hub [mm]<\/li>\n<li>\u03c3<sub>h<\/sub> : Yield stress of hub\u2019s raw material [Mpa]<\/li>\n<li>P<sub>o<\/sub> : Surface pressure onto hub by A.P. Lock [Mpa]<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column_inner fusion-builder-nested-column-7 fusion_builder_column_inner_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:3.84%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-19\"><div class=\"pronormalimg\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2025\/09\/power2_img1.jpg\"><\/div>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"parent":2312,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"100-width.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-2339","page","type-page","status-publish","hentry"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.sungilfa.co.kr\/en\/wp-json\/wp\/v2\/pages\/2339","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sungilfa.co.kr\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.sungilfa.co.kr\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.sungilfa.co.kr\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sungilfa.co.kr\/en\/wp-json\/wp\/v2\/comments?post=2339"}],"version-history":[{"count":29,"href":"https:\/\/www.sungilfa.co.kr\/en\/wp-json\/wp\/v2\/pages\/2339\/revisions"}],"predecessor-version":[{"id":10092,"href":"https:\/\/www.sungilfa.co.kr\/en\/wp-json\/wp\/v2\/pages\/2339\/revisions\/10092"}],"up":[{"embeddable":true,"href":"https:\/\/www.sungilfa.co.kr\/en\/wp-json\/wp\/v2\/pages\/2312"}],"wp:attachment":[{"href":"https:\/\/www.sungilfa.co.kr\/en\/wp-json\/wp\/v2\/media?parent=2339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}