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Use the image and chart below to determine what dimensions to use, all dimensions are in inches apart from the countersink angle. For example, an ANSI Inch 1/2″ flat head screw with a normal fit countersunk hole will require a pilot hole diameter of 9/16″, a countersunk diameter of 1″, and a countersunk angle of 82°.
Unsure on what size countersunk hole to use for your ANSI Metric socket flat head fasteners? Then look no further! This short post will give you the exact dimensions you need for your countersunk screws.
Countersink hole size charts are essential tools for selecting the correct countersink bit and ensuring that the screw head fits properly. These charts provide standardized dimensions for various screw sizes and materials.
For ANSI Metric socket flat head fasteners, the pilot hole diameter for an M6 flat head screw with a normal fit countersunk hole will be 6.6 mm, the countersunk diameter will be 13.71 mm, and the countersunk angle will be 90 degrees.
This chart shows the dimensions of counterbore and countersink holes for different screw sizes, in metric units (millimeters). Understand the types and use of countersink drill bit, countersink vs counterbore hole and check out the countersink size chart for holes/bits.
Countersunk Hole Size Chart for Socket Flat Head Fasteners (ANSI Inch) Using the above table, given #6 fastener with a loose fit, we have: Pilot Hole Diameter = 5/27; Countersink Diameter = 11/32; Countersink Angle = 82॰ That, along with the stated tolerance, gives a solution for the callout: Ø 5/27. V 11/32 ±0.005 х 82॰
Countersink Hole Size Charts. The tables below list the typical countersink dimensions for socket flat head screws to sit flush with the surface they are sunk into.
Countersink holes are precision-engineered features that are strategically created on the surface of a material, such as metal, wood, or plastic. These holes are conical in shape and are designed to accommodate the head of a screw, bolt, or rivet.
Just as with counterbore and spotface hole features, dimensions for a countersink are also listed directly below the dimension of the smaller coaxial hole. The countersink dimension contains the countersink symbol, the diameter of the countersink, and the angle of the cone.
Use the image and chart below to determine what dimensions to use, all dimensions are in millimetres apart from the countersink angle. For example, an ISO M10 flat head screw with a normal fit countersunk hole will require a pilot hole diameter of 11 mm, a countersunk diameter of 22.73 mm, and a countersunk angle of 90°.