Helix Angle: The angle made by the helix, or conical spiral, of the thread at a pitch diameter with a plane perpendicular to the axis.Ĭrest: The surface of the thread corresponding to the major diameter of the screw and the minor diameter of the nut. The pitch in inches: 1 divided by the Number of threads per inchĪngle of Thread: The angle included between the sides of the thread measured in an axial plane.
Pitch: The distance from a point on a screw thread to a corresponding point on the next thread measured parallel to the axis. On a taper screw thread, the diameter, at a given distance from a reference plane perpendicular to the axis of an imaginary cone, the surface of which would pass through the threads at such points as to make equal the width, the threads, and the width of the spaces cut by the surface of the cone. Pitch Diameter: On a straight screw thread, the diameter of an imaginary cylinder, the surface of which would pass through the threads at such points as to make equal the width, the threads, and the width of the spaces cut by the surface of the cylinder. The term “minor diameter” replaces the term “core diameter” as applied to the thread of a screw and also the term “inside diameter” as applied to the thread of a nut.
Minor Diameter: The smallest diameter of the thread of the screw or nut. The term “major diameter” replaces the term “outside diameter” as applied to the thread of a screw and also the term “full diameter” as applied to the thread of a nut. Major Diameter: The largest diameter of the thread of the screw or nut. Internal Thread: An internal thread is a thread on the inside of a member. Screw Thread: A ridge or uniform section in the form of a helix on the external or internal surface of a cylinder, or in the form of a conical spiral on the external or internal surface of a cone.Įxternal Thread: An external thread is a thread on the outside of a member.
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