This is a rounded exterior blend between surfaces:

More Questions from 2D Drawing Representation

• These are used to attach parts to a cylinder so they won't turn on it:
• This is a conical-shaped recess around a hole, often used to receive a tapered screw head:
• This is an angled surface used on cylinders to make them easier to handle:
• This is a flat or rounded tab protruding from a surface, usually to provide a method for attachment:
• This is a hollow cylinder that is often used as a protective sleeve or guide or as a bearing:
• A keyway is a small groove cut around the diameter of a cylinder, often where it changes diameter.
• Small curves called runouts are used to represent fillets that connect with plane surfaces tangent to cylinders.
• It is not always possible to show all of the drawing views in alignment on a sheet.
• Right-hand and left-hand parts are mirror images and are made to be interchangeable.
• A counterbore is a cylindrical recess around a hole, usually to receive a bolt head or nut.

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