{"id":163884,"date":"2021-09-01T11:43:38","date_gmt":"2021-09-01T03:43:38","guid":{"rendered":"http:\/\/facfox.com\/docs\/?post_type=kb&#038;p=163884"},"modified":"2021-09-01T11:43:38","modified_gmt":"2021-09-01T03:43:38","slug":"when-do-i-need-to-countersink-or-counterbore-a-hole-and-which-should-i-use","status":"publish","type":"kb","link":"https:\/\/facfox.com\/docs\/kb\/when-do-i-need-to-countersink-or-counterbore-a-hole-and-which-should-i-use","title":{"rendered":"When Do I Need To Countersink or Counterbore A Hole and Which Should I Use?"},"content":{"rendered":"<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/img.facfox.com\/imgs\/2021\/09\/f5dae49fef0323ec.png\" \/><\/p>\n<p>Countersinking is done to ensure that flat head screws sit flush to the workpiece.  A countersink produces a conical hole matching the angle of the screw so that when the screw is fully engaged the head will sit flush or slightly below the surface.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/img.facfox.com\/imgs\/2021\/09\/6c8abef66d23472f.png\" \/><\/p>\n<p>A counterbore is used to enlarge the opening of a hole producing a flat bottom so a socket-head screw will fit flush with the surface of the part. Lock washers may be used to ensure a secure assembly. Typically counterbores are used for a single purpose.<br \/>\nCountersinks have a greater range of applications and angles. Standard sizes include 60\u00b0, 82\u00b0, 90\u00b0 as well as less popular 100\u00b0,110\u2070 and 120\u00b0 included angles.  Because of the angle on this shank driven rotary tool they can be used to remove burrs or chamfer the corner of a part.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/img.facfox.com\/imgs\/2021\/09\/9ac6b02c0bd5f079.png\" \/><\/p>\n<p>Many styles of countersink are popular and each has distinct advantages. Fluteless countersinks are cone shape in the desired included angle with a hole drilled through the side of the cone, clearance exists to ensure free cutting. The most practical use is deburring.<\/p>\n<p>Single and multiple flute countersinks are used to chamfer threaded holes or provide a good seat for countersunk fasteners. There are also tools designed to chamfer or face the backside of a drilled or tapped hole. The shank of the tool is inserted through the drilled or tapped hole and a cutter is assembled on the backside.  The tool is then rotated and performs the chamfering or face operation.<\/p>\n<p>Additionally, there is another similar tool called a combination drill and countersink.  These doubled ended tools are used to produce a center in the end of a round product so that the part can be held between centers on a lathe or CNC machine.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Countersinking is done to ensure that flat head screws sit flush to the workpiece. A countersink produces a conical hole matching the angle of the screw so that when the screw is fully engaged the head will sit flush or slightly below the surface. A counterbore is used to enlarge the opening of a hole [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":163885,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"kbtopic":[137],"kbtag":[265,614,613],"class_list":["post-163884","kb","type-kb","status-publish","has-post-thumbnail","hentry","kbtopic-case","kbtag-cnc-milling","kbtag-counterbole","kbtag-hole"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>When Do I Need To Countersink or Counterbore A Hole and Which Should I Use? - FacFox Docs<\/title>\n<meta name=\"description\" content=\"Countersinking is done to ensure that flat head screws sit flush to the workpiece. A countersink produces a conical hole matching the angle of the screw\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/facfox.com\/docs\/kb\/when-do-i-need-to-countersink-or-counterbore-a-hole-and-which-should-i-use\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"When Do I Need To Countersink or Counterbore A Hole and Which Should I Use?\" \/>\n<meta property=\"og:description\" content=\"Countersinking is done to ensure that flat head screws sit flush to the workpiece. A countersink produces a conical hole matching the angle of the screw\" \/>\n<meta property=\"og:url\" content=\"https:\/\/facfox.com\/docs\/kb\/when-do-i-need-to-countersink-or-counterbore-a-hole-and-which-should-i-use\" \/>\n<meta property=\"og:site_name\" content=\"FacFox Docs\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/facebook.com\/facfox3d\" \/>\n<meta property=\"og:image\" content=\"https:\/\/facfox.com\/docs\/wp-content\/uploads\/2021\/09\/homeshop-machinist-09-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"900\" \/>\n\t<meta property=\"og:image:height\" content=\"443\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@facfox3d\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/facfox.com\\\/docs\\\/kb\\\/when-do-i-need-to-countersink-or-counterbore-a-hole-and-which-should-i-use\",\"url\":\"https:\\\/\\\/facfox.com\\\/docs\\\/kb\\\/when-do-i-need-to-countersink-or-counterbore-a-hole-and-which-should-i-use\",\"name\":\"When Do I Need To Countersink or Counterbore A Hole and Which Should I Use? - FacFox Docs\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/facfox.com\\\/docs\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/facfox.com\\\/docs\\\/kb\\\/when-do-i-need-to-countersink-or-counterbore-a-hole-and-which-should-i-use#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/facfox.com\\\/docs\\\/kb\\\/when-do-i-need-to-countersink-or-counterbore-a-hole-and-which-should-i-use#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/facfox.com\\\/docs\\\/wp-content\\\/uploads\\\/2021\\\/09\\\/homeshop-machinist-09-1.jpg\",\"datePublished\":\"2021-09-01T03:43:38+00:00\",\"description\":\"Countersinking is done to ensure that flat head screws sit flush to the workpiece. 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