{"id":845,"date":"2020-09-30T17:20:34","date_gmt":"2020-09-30T09:20:34","guid":{"rendered":"http:\/\/www.bestpcbs.com\/blog\/?p=845"},"modified":"2020-09-30T17:22:53","modified_gmt":"2020-09-30T09:22:53","slug":"whats-the-countersink-and-counter-bore-on-a-pcb-drawing","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2020\/09\/whats-the-countersink-and-counter-bore-on-a-pcb-drawing\/","title":{"rendered":"What\u00e2\u20ac\u2122s the Countersink and counter bore on a PCB drawing?"},"content":{"rendered":"<div class=\"yzp-no-index\"><\/div>\n<p>Firstly, do you know what\u00e2\u20ac\u2122s a countersink and counter bore?<\/p>\n\n\n\n<p>By definition, a countersink is a stepped hole, which can allow the fasten parts head to sink fully to the parts.<\/p>\n\n\n\n<p>With counter sink on your design, the tapered head of a screw can sit flush with the top of the laminate, commonly countersink is used to install bolts or other connecting parts.<\/p>\n\n\n\n<p>Below is the example for the hole drawing and picture for a countersink:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blogimages\/2020\/09\/25\/countersink-drawing.jpg\"><img decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blogimages\/2020\/09\/25\/countersink-drawing-s.jpg\" alt=\"\"\/><\/a><\/figure>\n\n\n\n<p>Picture: counterbore holes attributes<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blogimages\/2020\/09\/25\/counter-sink-pcb-from-best-technology.jpg\"><img decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blogimages\/2020\/09\/25\/counter-sink-pcb-from-best-technology-s.jpg\" alt=\"\"\/><\/a><\/figure>\n\n\n\n<p>To drill your countersunk holes accurately in our <a href=\"https:\/\/www.bestpcbs.com\/products\/FR4-pcb.htm\">PCB <\/a>fabrication plant, the following information is need to be defined when you supply the <a href=\"https:\/\/www.bestpcbs.com\/products\/FR4-pcb.htm\">PCB <\/a>drawing for us to make the PCB:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Which side of the board is the countersink hole should be drilled, on top or bottom?<\/li><li>Is the sink and shaft to be through plated or non-plated?<\/li><li>Taper angle or countersink angle. 82\u00c2\u00b0, 90\u00c2\u00b0,120\u00c2\u00b0 etc.<\/li><li>Countersink diameter of top<\/li><li>Countersink diameter of bottom (body)<\/li><li>Depth of the countersink is to be drilled\u00ef\u00bc\u02c6the height of the screw to determine the countersink depth.<\/li><\/ul>\n\n\n\n<p>By comparison, a counterbore makes a flat-bottomed hole and its sides are drilled straight down. This is usually used when a fastener such as a bolt or cap head screw is required to sit flush with or below the level of a surface.<\/p>\n\n\n\n<p>Below is the drawing and picture for a countersink.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blogimages\/2020\/09\/25\/counter-bore-drawing-of-a-board.jpg\"><img decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blogimages\/2020\/09\/25\/counter-bore-drawing-of-a-board-s.jpg\" alt=\"\"\/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blogimages\/2020\/09\/25\/counter-bore-holes-on-pcb-from-best-technology.jpg\"><img decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blogimages\/2020\/09\/25\/counter-bore-holes-on-pcb-from-best-technology-s.jpg\" alt=\"\"\/><\/a><\/figure>\n\n\n\n<p>Same as the countersink, the counterbore holes\u00c2\u00a0attributes drawing is needed to supply with your <a href=\"https:\/\/www.bestpcbs.com\/products\/FR4-pcb.htm\">PCB<\/a> drawing when fabricate the counterbored holes. But for counterbore on PCB, because the sides of the hole are always parallel, there is no need to specify the angle.<\/p>\n\n\n\n<p>With below drawing, believe it will be more helpful for you to understand the difference for a counter sink hole and counterbore on the printed circuits board.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blogimages\/2020\/09\/25\/difference-for-a-counterbore-and-countersink-pcb.jpg\"><img decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blogimages\/2020\/09\/25\/difference-for-a-counterbore-and-countersink-pcb-s.jpg\" alt=\"\"\/><\/a><\/figure>\n\n\n\n<p>If need to have any question regarding the counter sunk or counter board on a <a href=\"https:\/\/www.bestpcbs.com\/products\/FR4-pcb.htm\">PCB<\/a> drawing, please contact us feel free.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Firstly, do you know what\u00e2\u20ac\u2122s a countersink and counter bore? By definition, a countersink is a stepped hole, which can allow the fasten parts head to sink fully to the parts. With counter sink on your design, the tapered head of a screw can sit flush with the top of the laminate, commonly countersink is [&hellip;]<\/p>\n","protected":false},"author":623,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[165,15,3,16],"tags":[168],"class_list":["post-845","post","type-post","status-publish","format-standard","hentry","category-fr4-pcb","category-our-news","category-pcb-news","category-pcb-technology","tag-pcb-drawing"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/845","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/users\/623"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/comments?post=845"}],"version-history":[{"count":3,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/845\/revisions"}],"predecessor-version":[{"id":848,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/845\/revisions\/848"}],"wp:attachment":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/media?parent=845"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/categories?post=845"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/tags?post=845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}