{"id":5717,"date":"2026-11-03T08:29:30","date_gmt":"2026-11-03T08:29:30","guid":{"rendered":"https:\/\/flj-pcb.com\/?page_id=5717"},"modified":"2026-11-03T08:29:30","modified_gmt":"2026-11-03T08:29:30","slug":"backdrill-pcb","status":"publish","type":"page","link":"https:\/\/flj-pcb.com\/ja\/pcb-manufacturer\/backdrill-pcb\/","title":{"rendered":"Backdrill PCB"},"content":{"rendered":"<div class=\"bd-page flj-page\" id=\"flj-content\">\n<section class=\"bd-hero\"><div class=\"bd-hero-image\"><img fetchpriority=\"high\" width=\"800\" height=\"533\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/DRILLING.webp\" class=\"attachment-full size-full\" alt=\"PCB drilling equipment with multiple spindle stations and extraction hoses\" decoding=\"async\" loading=\"eager\" sizes=\"(max-width: 800px) calc(100vw - 40px), 600px\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/DRILLING.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/DRILLING-300x200.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/DRILLING-768x512.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/DRILLING-18x12.webp 18w\" \/><\/div><div class=\"container bd-hero-inner\"><div class=\"bd-hero-copy\"><p class=\"bd-eyebrow\">Controlled-depth PCB fabrication<\/p><h1>Backdrill PCB<br\/>\u88fd\u9020\u696d<\/h1><p class=\"bd-hero-lead\">Remove the unused copper.<br\/>Keep the connection your circuit needs.<\/p><p>FLJ manufactures multilayer PCBs with controlled-depth backdrilling for high-speed interconnections. Single-sided and double-sided machining remove unused plated barrel sections while preserving the functional connection, from prototype boards to production.<\/p><a class=\"btn\" href=\"https:\/\/flj-pcb.com\/ja\/contact\/\">Get a backdrilled PCB quote <span aria-hidden=\"true\" class=\"bd-arrow\"><svg focusable=\"false\" viewbox=\"0 0 16 16\"><path d=\"M3 13L13 3M4 3H13V12\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\"><\/path><\/svg><\/span><\/a><\/div><\/div><div class=\"bd-photo-caption\">PCB drilling equipment \u00b7 FLJ media library<\/div><\/section>\n<div class=\"bd-index\"><div class=\"container\"><nav aria-label=\"On this page\"><a href=\"#bd-connections\">Backdrilling services<\/a><a href=\"#bd-geometry\">Depth &amp; clearance<\/a><a href=\"#bd-manufacture\">\u88fd\u9020\u696d<\/a><a href=\"#bd-verification\">Verification<\/a><\/nav><\/div><\/div>\n<section class=\"bd-section\" id=\"bd-connections\"><div class=\"container\"><div class=\"bd-section-head\"><p class=\"bd-eyebrow\">Single-sided and double-sided backdrilling<\/p><h2>Backdrilling Services for High-Speed PCBs<\/h2><\/div><div class=\"bd-signal-layout\"><aside aria-labelledby=\"bd-service-title\" class=\"bd-service-panel\">\n<p class=\"bd-service-label\">FLJ Backdrilling Services<\/p>\n<h3 id=\"bd-service-title\">Backdrilling as Part of Your PCB Build<\/h3>\n<p>Multilayer PCB fabrication with controlled-depth machining, from prototype boards to production.<\/p>\n<dl class=\"bd-service-options\"><div><dt>Single-sided backdrilling<\/dt><dd>Stub removal from one entry face.<\/dd><\/div><div><dt>Double-sided backdrilling<\/dt><dd>Separate removal spans from both faces.<\/dd><\/div><\/dl>\n<a class=\"btn\" href=\"https:\/\/flj-pcb.com\/ja\/contact\/\">Discuss your backdrill PCB <span aria-hidden=\"true\" class=\"bd-arrow\"><svg focusable=\"false\" viewbox=\"0 0 16 16\"><path d=\"M3 13L13 3M4 3H13V12\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\"><\/path><\/svg><\/span><\/a>\n<\/aside><div class=\"bd-prose\"><h3 id=\"bd-signal\">Via Stubs and the Signal Path<\/h3><p>A plated through-hole can carry a signal from the board surface to an inner-layer land, while its copper wall continues beyond that connection. The unused extension is a via stub. It remains attached to the signal path even though it does not carry the connection to another required land.<\/p><p>At the junction, some signal energy can enter this branch and return as a reflection from its open end. The returning energy can alter the waveform and timing margin at the receiver. Stub length and the signal&#8217;s frequency content influence that behavior.<\/p><p>Backdrilling removes much of the unused copper extension. It addresses this local discontinuity within a larger <a href=\"https:\/\/flj-pcb.com\/ja\/pcb-manufacturer\/high-speed-pcb\/\">high-speed PCB construction<\/a>, where routing, reference planes, materials and connectors also determine channel behavior. Backplanes, networking boards and dense board-to-board interconnects are common settings for that combination.<\/p><\/div><\/div><div class=\"bd-subject-heading\"><h3 id=\"bd-sides\">Single-Sided and Double-Sided Backdrilling<\/h3><p>The entry face follows the copper that is to be removed. A surface-to-inner-layer connection may leave a stub toward the opposite face. An internal-to-internal connection can leave unused copper toward both surfaces, requiring two separate cuts.<\/p><\/div><figure class=\"bd-spans\"><div class=\"bd-span-panels\"><div class=\"bd-span-panel\"><strong>One entry face<\/strong><svg aria-label=\"Single-sided backdrilling retains a top-to-inner connection and removes the lower unused barrel\" role=\"img\" style=\"font-family:Arial,Helvetica,sans-serif\" viewbox=\"0 0 520 432\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><title>Single-sided backdrilling retains a top-to-inner connection and removes the lower unused barrel<\/title><defs><marker id=\"single-arrow\" markerheight=\"7\" markerwidth=\"7\" orient=\"auto-start-reverse\" refx=\"5.8\" refy=\"3.5\"><path d=\"M0 0L7 3.5L0 7Z\" fill=\"#63796f\"><\/path><\/marker><\/defs><rect fill=\"#e9ddb8\" height=\"244\" width=\"230\" x=\"145\" y=\"92\"><\/rect><path d=\"M145 110H235M275 110H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"9\"><\/path><path d=\"M145 150H207M303 150H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><path d=\"M145 190H235M275 190H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"9\"><\/path><path d=\"M145 230H207M303 230H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><path d=\"M145 270H207M303 270H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><path d=\"M145 310H207M303 310H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><rect fill=\"#b87543\" height=\"230\" width=\"10\" x=\"225\" y=\"106\"><\/rect><rect fill=\"#b87543\" height=\"230\" width=\"10\" x=\"275\" y=\"106\"><\/rect><rect fill=\"#ffffff\" height=\"244\" width=\"40\" x=\"235\" y=\"92\"><\/rect><path d=\"M205 336V246L255 196L305 246V336Z\" fill=\"white\" stroke=\"#8a9990\" stroke-width=\"1.7\"><\/path><text fill=\"#2c463f\" font-size=\"22\" x=\"18\" y=\"83\">Top land<\/text><path d=\"M113 80L146 110\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"146\" cy=\"110\" fill=\"#63796f\" r=\"3.2\"><\/circle><text fill=\"#2c463f\" font-size=\"22\" x=\"18\" y=\"184\">Inner land<\/text><path d=\"M124 180L148 190\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"148\" cy=\"190\" fill=\"#63796f\" r=\"3.2\"><\/circle><text fill=\"#2c463f\" font-size=\"22\" x=\"18\" y=\"258\">Residual<\/text><text fill=\"#2c463f\" font-size=\"22\" x=\"18\" y=\"284\">stub<\/text><path d=\"M120 260L230 222\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"230\" cy=\"222\" fill=\"#63796f\" r=\"3.2\"><\/circle><text fill=\"#2c463f\" font-size=\"22\" x=\"390\" y=\"146\">Plated<\/text><text fill=\"#2c463f\" font-size=\"22\" x=\"390\" y=\"172\">span<\/text><path d=\"M394 183L280 167\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"280\" cy=\"167\" fill=\"#63796f\" r=\"3.2\"><\/circle><text fill=\"#2c463f\" font-size=\"22\" x=\"380\" y=\"285\">Removed<\/text><text fill=\"#2c463f\" font-size=\"22\" x=\"380\" y=\"311\">barrel<\/text><path d=\"M383 274L299 284\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><path d=\"M255 382V340\" fill=\"none\" marker-end=\"url(#single-arrow)\" stroke=\"#63796f\" stroke-width=\"2\"><\/path><text fill=\"#2c463f\" font-size=\"22\" text-anchor=\"middle\" x=\"255\" y=\"413\">Entry from bottom<\/text><\/svg><\/div><div class=\"bd-span-panel\"><strong>Two entry faces<\/strong><svg aria-label=\"Double-sided backdrilling removes unused barrel from both faces while retaining an internal-to-internal connection\" role=\"img\" style=\"font-family:Arial,Helvetica,sans-serif\" viewbox=\"0 0 520 432\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><title>Double-sided backdrilling removes unused barrel from both faces while retaining an internal-to-internal connection<\/title><defs><marker id=\"double-arrow\" markerheight=\"7\" markerwidth=\"7\" orient=\"auto-start-reverse\" refx=\"5.8\" refy=\"3.5\"><path d=\"M0 0L7 3.5L0 7Z\" fill=\"#63796f\"><\/path><\/marker><\/defs><rect fill=\"#e9ddb8\" height=\"244\" width=\"230\" x=\"145\" y=\"92\"><\/rect><path d=\"M145 110H207M303 110H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><path d=\"M145 150H235M275 150H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"9\"><\/path><path d=\"M145 190H207M303 190H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><path d=\"M145 230H207M303 230H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><path d=\"M145 270H235M275 270H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"9\"><\/path><path d=\"M145 310H207M303 310H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><rect fill=\"#b87543\" height=\"244\" width=\"10\" x=\"225\" y=\"92\"><\/rect><rect fill=\"#b87543\" height=\"244\" width=\"10\" x=\"275\" y=\"92\"><\/rect><rect fill=\"#ffffff\" height=\"244\" width=\"40\" x=\"235\" y=\"92\"><\/rect><path d=\"M205 92V101L255 151L305 101V92Z\" fill=\"white\" stroke=\"#8a9990\" stroke-width=\"1.7\"><\/path><path d=\"M205 336V319L255 269L305 319V336Z\" fill=\"white\" stroke=\"#8a9990\" stroke-width=\"1.7\"><\/path><text fill=\"#2c463f\" font-size=\"22\" text-anchor=\"middle\" x=\"255\" y=\"31\">Top entry<\/text><path d=\"M255 42V86\" fill=\"none\" marker-end=\"url(#double-arrow)\" stroke=\"#63796f\" stroke-width=\"2\"><\/path><text fill=\"#2c463f\" font-size=\"22\" x=\"12\" y=\"155\">Upper land<\/text><path d=\"M131 151L146 150\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"146\" cy=\"150\" fill=\"#63796f\" r=\"3.2\"><\/circle><text fill=\"#2c463f\" font-size=\"22\" x=\"12\" y=\"280\">Lower land<\/text><path d=\"M130 276L147 270\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"147\" cy=\"270\" fill=\"#63796f\" r=\"3.2\"><\/circle><text fill=\"#2c463f\" font-size=\"22\" x=\"390\" y=\"207\">Retained<\/text><text fill=\"#2c463f\" font-size=\"22\" x=\"390\" y=\"233\">span<\/text><path d=\"M393 244L280 216\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"280\" cy=\"216\" fill=\"#63796f\" r=\"3.2\"><\/circle><text fill=\"#2c463f\" font-size=\"22\" x=\"391\" y=\"119\">Stub<\/text><path d=\"M391 125L280 134\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"280\" cy=\"134\" fill=\"#63796f\" r=\"3.2\"><\/circle><text fill=\"#2c463f\" font-size=\"22\" x=\"391\" y=\"310\">Stub<\/text><path d=\"M391 296L280 294\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"280\" cy=\"294\" fill=\"#63796f\" r=\"3.2\"><\/circle><path d=\"M255 383V341\" fill=\"none\" marker-end=\"url(#double-arrow)\" stroke=\"#63796f\" stroke-width=\"2\"><\/path><text fill=\"#2c463f\" font-size=\"22\" text-anchor=\"middle\" x=\"255\" y=\"413\">Bottom entry<\/text><\/svg><\/div><\/div><figcaption>Illustrative connection spans. Only designated lands connect to the plated wall; other copper layers have clearance. The removed regions and residual copper are exaggerated and are not a production stackup.<\/figcaption><\/figure><p class=\"bd-figure-continuation\">Each cut stops short of the last required connection, leaving a controlled residual stub. The aim is to reduce the unused extension while retaining the copper at the functional land. A double-sided construction has a separate machining direction and stopping position for each face.<\/p><\/div><\/section>\n<section class=\"bd-section bd-geometry\" id=\"bd-geometry\"><div class=\"container\"><div class=\"bd-section-head\"><p class=\"bd-eyebrow\">Z depth \u00b7 XY registration \u00b7 Copper envelope<\/p><h2>Depth, Residual Stub and Copper Clearance<\/h2><p class=\"bd-intro\">The backdrilled feature is defined by where the cutter enters, how far it travels and how its removal envelope sits around the original plated hole.<\/p><\/div><div class=\"bd-depth-layout\"><div class=\"bd-prose\"><h3 id=\"bd-depth\">Drilling Depth and the Remaining Stub<\/h3><p>The machining program sets travel from the entry reference to a defined tool position. In the illustrated example, that position is the drill-tip apex. Residual stub length describes the copper left beyond the last functional connection: it is assessed at the barrel wall, rather than at the center of the drilled cavity.<\/p><p>The actual layer position, board thickness and tool-tip shape influence the relationship between them. A conical tip reaches farther at the hole center than at the original barrel wall. The copper remaining at that wall is therefore not identified by the position of the drill apex alone.<\/p><div class=\"bd-capability\"><span>Backdrilling minimum depth<\/span><strong>0.2 <small>mm<\/small><\/strong><p>Published process reference. Residual stub targets and depth tolerance follow the selected board construction.<\/p><a href=\"https:\/\/flj-pcb.com\/ja\/capabilities\/pcb-manufacturing\/#section-6\">PCB fabrication capabilities <span aria-hidden=\"true\" class=\"bd-arrow\"><svg focusable=\"false\" viewbox=\"0 0 16 16\"><path d=\"M3 13L13 3M4 3H13V12\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\"><\/path><\/svg><\/span><\/a><\/div><\/div><figure class=\"bd-depth-figure\"><svg aria-label=\"Tool-tip travel from the entry datum differs from residual copper length measured beyond the connected land\" role=\"img\" style=\"font-family:Arial,Helvetica,sans-serif\" viewbox=\"0 0 520 420\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><title>Tool-tip travel from the entry datum differs from residual copper length measured beyond the connected land<\/title><defs><marker id=\"depth-arrow\" markerheight=\"7\" markerwidth=\"7\" orient=\"auto-start-reverse\" refx=\"5.8\" refy=\"3.5\"><path d=\"M0 0L7 3.5L0 7Z\" fill=\"#63796f\"><\/path><\/marker><\/defs><rect fill=\"#e9ddb8\" height=\"254\" width=\"230\" x=\"145\" y=\"91\"><\/rect><path d=\"M145 110H207M303 110H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><path d=\"M145 155H235M275 155H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"9\"><\/path><path d=\"M145 205H207M303 205H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><path d=\"M145 255H207M303 255H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><path d=\"M145 310H207M303 310H375\" fill=\"none\" stroke=\"#b87543\" stroke-width=\"7\"><\/path><rect fill=\"#b87543\" height=\"254\" width=\"10\" x=\"225\" y=\"91\"><\/rect><rect fill=\"#b87543\" height=\"254\" width=\"10\" x=\"275\" y=\"91\"><\/rect><rect fill=\"#ffffff\" height=\"254\" width=\"40\" x=\"235\" y=\"91\"><\/rect><path d=\"M185 345V260L255 190L325 260V345Z\" fill=\"white\" stroke=\"#8a9990\" stroke-width=\"1.8\"><\/path><text fill=\"#2c463f\" font-size=\"22\" x=\"16\" y=\"54\">Connected land<\/text><path d=\"M130 62L146 155\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"146\" cy=\"155\" fill=\"#63796f\" r=\"3.2\"><\/circle><path d=\"M117 159V215M111 159H225M111 215H230\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><text fill=\"#2c463f\" font-size=\"22\" x=\"13\" y=\"181\">Residual<\/text><text fill=\"#2c463f\" font-size=\"22\" x=\"13\" y=\"207\">stub<\/text><text fill=\"#2c463f\" font-size=\"22\" x=\"343\" y=\"56\">Cut-tip apex<\/text><path d=\"M387 66L255 190\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"255\" cy=\"190\" fill=\"#63796f\" r=\"3.2\"><\/circle><text fill=\"#2c463f\" font-size=\"22\" x=\"298\" y=\"293\">Copper end<\/text><path d=\"M345 275L280 215\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"280\" cy=\"215\" fill=\"#63796f\" r=\"3.2\"><\/circle><path d=\"M118 345H449\" fill=\"none\" stroke=\"#63796f\" stroke-dasharray=\"5 4\" stroke-width=\"1.7\"><\/path><text fill=\"#2c463f\" font-size=\"22\" x=\"16\" y=\"392\">Entry datum<\/text><path d=\"M145 382L150 345\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><path d=\"M444 190V345\" fill=\"none\" marker-end=\"url(#depth-arrow)\" marker-start=\"url(#depth-arrow)\" stroke=\"#63796f\" stroke-width=\"1.8\"><\/path><path d=\"M262 190H449\" fill=\"none\" stroke=\"#63796f\" stroke-dasharray=\"5 4\" stroke-width=\"1.7\"><\/path><text fill=\"#2c463f\" font-size=\"22\" text-anchor=\"middle\" transform=\"rotate(-90 487 270)\" x=\"487\" y=\"270\">Tool-tip travel<\/text><\/svg><figcaption>Depth and remaining copper describe different locations. The tool-tip envelope is illustrated; no machining depth, residual target or tolerance is specified by this drawing.<\/figcaption><\/figure><\/div><div class=\"bd-registration-layout\"><div class=\"bd-prose\"><h3 id=\"bd-registration\">Cutter Diameter and Hole Registration<\/h3><p>The secondary cutter is larger than the original plated hole so its cutting envelope can clear the barrel wall. Its diameter and position must work together: a cut that misses part of the wall can leave an unwanted copper crescent.<\/p><p>A larger removal envelope also occupies space around the original hole. Adjacent traces, planes and lands need clearance from that envelope throughout the machined span. Registration allowance and nearby copper therefore belong in the same geometric decision.<\/p><p>Where the layout instead calls for a connection confined to selected layers, <a href=\"https:\/\/flj-pcb.com\/ja\/pcb-manufacturer\/blind-buried-vias\/\">blind and buried via constructions<\/a> provide a different fabrication route. The choice follows the layer access, routing space and complete board construction.<\/p><\/div><figure class=\"bd-plan-figure\"><svg aria-label=\"Plan views compare a centered enlarged cut with an offset cut that leaves a crescent of original barrel copper\" role=\"img\" style=\"font-family:Arial,Helvetica,sans-serif\" viewbox=\"0 0 520 615\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><title>Plan views compare a centered enlarged cut with an offset cut that leaves a crescent of original barrel copper<\/title><defs><marker id=\"registration-arrow\" markerheight=\"7\" markerwidth=\"7\" orient=\"auto-start-reverse\" refx=\"5.8\" refy=\"3.5\"><path d=\"M0 0L7 3.5L0 7Z\" fill=\"#63796f\"><\/path><\/marker><\/defs><defs><mask id=\"registration-remaining\"><rect fill=\"white\" height=\"640\" width=\"520\"><\/rect><circle cx=\"270\" cy=\"450\" fill=\"black\" r=\"65\"><\/circle><circle cx=\"230\" cy=\"155\" fill=\"black\" r=\"65\"><\/circle><\/mask><\/defs><rect fill=\"#e9ddb8\" height=\"194\" width=\"380\" x=\"70\" y=\"58\"><\/rect><rect fill=\"#b87543\" height=\"140\" width=\"15\" x=\"388\" y=\"85\"><\/rect><circle cx=\"230\" cy=\"155\" fill=\"none\" mask=\"url(#registration-remaining)\" r=\"44.5\" stroke=\"#b87543\" stroke-width=\"11\"><\/circle><circle cx=\"230\" cy=\"155\" fill=\"white\" r=\"65\" stroke=\"#63796f\" stroke-dasharray=\"7 4\" stroke-width=\"2\"><\/circle><circle cx=\"230\" cy=\"155\" fill=\"none\" mask=\"url(#registration-remaining)\" r=\"44.5\" stroke=\"#b87543\" stroke-width=\"11\"><\/circle><circle cx=\"230\" cy=\"155\" fill=\"none\" r=\"50\" stroke=\"#b87543\" stroke-dasharray=\"4 4\" stroke-width=\"1.7\"><\/circle><circle cx=\"230\" cy=\"155\" fill=\"none\" r=\"39\" stroke=\"#b87543\" stroke-dasharray=\"4 4\" stroke-width=\"1.7\"><\/circle><path d=\"M224 155H236M230 149V161\" stroke=\"#63796f\" stroke-width=\"1.4\"><\/path><rect fill=\"#e9ddb8\" height=\"194\" width=\"380\" x=\"70\" y=\"353\"><\/rect><rect fill=\"#b87543\" height=\"140\" width=\"15\" x=\"388\" y=\"380\"><\/rect><circle cx=\"230\" cy=\"450\" fill=\"none\" mask=\"url(#registration-remaining)\" r=\"44.5\" stroke=\"#b87543\" stroke-width=\"11\"><\/circle><circle cx=\"270\" cy=\"450\" fill=\"white\" r=\"65\" stroke=\"#63796f\" stroke-dasharray=\"7 4\" stroke-width=\"2\"><\/circle><circle cx=\"230\" cy=\"450\" fill=\"none\" mask=\"url(#registration-remaining)\" r=\"44.5\" stroke=\"#b87543\" stroke-width=\"11\"><\/circle><circle cx=\"230\" cy=\"450\" fill=\"none\" r=\"50\" stroke=\"#b87543\" stroke-dasharray=\"4 4\" stroke-width=\"1.7\"><\/circle><circle cx=\"230\" cy=\"450\" fill=\"none\" r=\"39\" stroke=\"#b87543\" stroke-dasharray=\"4 4\" stroke-width=\"1.7\"><\/circle><path d=\"M224 450H236M230 444V456\" stroke=\"#63796f\" stroke-width=\"1.4\"><\/path><text fill=\"#2c463f\" font-size=\"24\" x=\"20\" y=\"32\">Aligned cut clears the wall<\/text><text fill=\"#2c463f\" font-size=\"22\" x=\"18\" y=\"86\">Original wall<\/text><path d=\"M149 82L199 116\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"199\" cy=\"116\" fill=\"#63796f\" r=\"3.2\"><\/circle><text fill=\"#2c463f\" font-size=\"22\" x=\"18\" y=\"285\">Cut envelope<\/text><path d=\"M171 277L275 201\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><text fill=\"#2c463f\" font-size=\"22\" x=\"323\" y=\"282\">Nearby copper<\/text><path d=\"M393 260V230\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><text fill=\"#2c463f\" font-size=\"24\" x=\"20\" y=\"328\">Offset beyond full coverage<\/text><text fill=\"#2c463f\" font-size=\"22\" x=\"18\" y=\"579\">Copper remains<\/text><path d=\"M185 570L187 452\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><circle cx=\"187\" cy=\"452\" fill=\"#63796f\" r=\"3.2\"><\/circle><text fill=\"#2c463f\" font-size=\"22\" x=\"324\" y=\"579\">Offset cut<\/text><path d=\"M374 559L323 488\" fill=\"none\" stroke=\"#63796f\" stroke-width=\"1.7\"><\/path><\/svg><figcaption>Illustrative plan views through the portion to be removed. The offset example leaves copper because the enlarged cut fails to cover the original plated wall.<\/figcaption><\/figure><\/div><p class=\"bd-table-lead\">A backdrill definition connects these dimensions to the same selected hole and connection:<\/p><p class=\"bd-table-hint\" id=\"bd-table-hint\">Scroll to view each feature and its relationship \u2192<\/p><div aria-describedby=\"bd-table-hint\" aria-label=\"Backdrill feature relationships\" class=\"bd-table-wrap\" role=\"region\" tabindex=\"0\"><table><thead><tr><th scope=\"col\">\u7279\u5fb4<\/th><th scope=\"col\">Relationship in the board<\/th><th scope=\"col\">What it defines<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Entry face &amp; retained layer<\/th><td>The side of the unused extension relative to the required connection<\/td><td>Machining direction and retained span<\/td><\/tr><tr><th scope=\"row\">Depth &amp; tool-tip envelope<\/th><td>Commanded travel and the cutting shape relative to the actual connected layer<\/td><td>The machining position<\/td><\/tr><tr><th scope=\"row\">Residual stub &amp; retained land<\/th><td>Unused copper extending beyond the last required connection<\/td><td>The finished copper length to be checked<\/td><\/tr><tr><th scope=\"row\">Cutter diameter &amp; registration<\/th><td>Removal envelope around the original plated wall<\/td><td>Copper removal and surrounding clearance<\/td><\/tr><\/tbody><\/table><\/div><\/div><\/section>\n<section class=\"bd-section\" id=\"bd-manufacture\"><div class=\"container\"><div class=\"bd-section-head\"><p class=\"bd-eyebrow\">Making the specified removal span<\/p><h2>Controlled-Depth Backdrilling in Manufacture<\/h2><\/div><div class=\"bd-machining-layout\"><div class=\"bd-prose\"><h3 id=\"bd-secondary-cut\">From Plated Through-Hole to Secondary Cut<\/h3><p>Backdrilling acts on an existing conductive barrel. Primary drilling, hole-wall preparation and copper metallization establish the plated connection first. The secondary cut then removes the part of that wall which lies outside the required electrical span.<\/p><p>FLJ prepares the machining data around the selected holes, entry faces, retained layers and cutter sizes. Holes sharing a removal depth can be organized into machining groups, while connections at different layers require their own stopping positions. For two-sided work, each face has its corresponding reference and removal span.<\/p><p>The machining operation is registered to the original hole pattern. The programmed cut combines the layer-position information with the cutter&#8217;s geometry, so the intended copper is removed without cutting through the required connection.<\/p><\/div><figure class=\"bd-production-photo\"><img loading=\"lazy\" width=\"600\" height=\"450\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/backdrilled-board.webp\" class=\"attachment-full size-full\" alt=\"Copper-colored panels with drilled hole arrays resting in production equipment\" decoding=\"async\" sizes=\"auto, (max-width: 800px) calc(100vw - 40px), 600px\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/backdrilled-board.webp 600w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2025\/09\/backdrilled-board-300x225.webp 300w\" \/><figcaption>Drilled panels in a production setting. Internal connections and remaining stub dimensions require examination of the board construction.<\/figcaption><\/figure><\/div><div class=\"bd-manufacturing-services\">\n<div class=\"bd-controls-head\"><div><p class=\"bd-eyebrow\">Machining and process control<\/p><h3 id=\"bd-process-control\">Manufacturing Controls for Backdrilled PCBs<\/h3><\/div><a class=\"bd-service-link\" href=\"https:\/\/flj-pcb.com\/ja\/contact\/\">Request a backdrill quote <span aria-hidden=\"true\" class=\"bd-arrow\"><svg focusable=\"false\" viewbox=\"0 0 16 16\"><path d=\"M3 13L13 3M4 3H13V12\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\"><\/path><\/svg><\/span><\/a><\/div>\n<div class=\"bd-control-grid\">\n<div class=\"bd-control-card\"><span class=\"bd-control-tag\">Depth reference<\/span><h4>Panel Support &amp; Depth Referencing<\/h4><p>FLJ sets up panel support and the entry reference for controlled-depth machining. Local board shape, thickness variation and the connected layer&#8217;s position affect how the programmed travel corresponds to the physical board.<\/p><\/div>\n<div class=\"bd-control-card\"><span class=\"bd-control-tag\">Cutting process<\/span><h4>Tool Registration &amp; Chip Removal<\/h4><p>The cutter is aligned with the original hole pattern. Tool condition, spindle behavior and chip evacuation are controlled during removal of the copper and laminate; these factors affect the cavity and the copper remaining around it.<\/p><\/div>\n<div class=\"bd-control-card\"><span class=\"bd-control-tag\">Finished feature<\/span><h4>Cleaning &amp; Connection Checks<\/h4><p>After cutting, the opening is cleaned and examined for retained chips and incomplete removal. The retained connection is assessed alongside the machined region, with sampled sections used to examine the remaining copper.<\/p><\/div>\n<\/div>\n<div class=\"bd-process-feedback\"><strong>Relating the cut to the next setup check<\/strong><p>A sampled section can reveal an excessive residual length or copper remaining on one side of the cavity. Excess residual length directs attention to the depth reference and layer\/tool geometry; a localized copper remnant directs attention to cutter coverage and registration. An electrical pass alone does not establish that the removal geometry is complete.<\/p><\/div>\n<\/div><\/div><\/section>\n<section class=\"bd-section bd-verification\" id=\"bd-verification\"><div class=\"container\"><div class=\"bd-section-head\"><p class=\"bd-eyebrow\">Observe the copper that remains<\/p><h2>Verifying the Backdrilled Connection<\/h2><\/div><div class=\"bd-verification-grid\"><div class=\"bd-prose\"><h3 id=\"bd-residual-check\">Residual Copper and the Retained Connection<\/h3><p>A prepared microsection exposes the cut cavity, the end of the remaining barrel and the connection at the retained layer. These features show whether the intended copper was removed and where the residual stub ends relative to the functional land.<\/p><p>The section needs to pass through the feature being assessed. Its position and preparation affect what is visible; an off-center section can give a misleading view of the drilled cavity. The result describes the sampled plane rather than every location in every hole.<\/p><\/div><div class=\"bd-prose\"><h3 id=\"bd-electrical-check\">Geometrical and Electrical Checks<\/h3><p><a href=\"https:\/\/flj-pcb.com\/ja\/testing\/pcb-electrical-testing\/\">Bare-board electrical testing<\/a> checks the continuity and isolation of the copper network. A connection can pass that test while still retaining an unwanted stub, so electrical connectivity and residual geometry are separate inspection questions.<\/p><p>Signal-integrity evaluation considers the wider channel response, including the via transition. A line-impedance coupon and its TDR result describe their tested structure; they do not automatically report the residual copper length of every backdrilled connection.<\/p><\/div><\/div><div class=\"bd-inquiry\"><div><h3>Manufacture your backdrilled PCB<\/h3><p>Send the fabrication data, stackup and quantity, with the selected backdrill holes, entry faces, retained layers and residual-stub requirements. FLJ connects that definition with PCB fabrication and controlled-depth machining.<\/p><\/div><a class=\"btn\" href=\"https:\/\/flj-pcb.com\/ja\/contact\/\">Request a PCB quote <span aria-hidden=\"true\" class=\"bd-arrow\"><svg focusable=\"false\" viewbox=\"0 0 16 16\"><path d=\"M3 13L13 3M4 3H13V12\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\"><\/path><\/svg><\/span><\/a><\/div><\/div><\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Controlled-depth PCB fabrication Backdrill PCBManufacturing Remove the unused copper.Keep the connection your circuit needs. FLJ manufactures multilayer PCBs with controlled-depth [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1898,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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