GLOSSARY OF TERMS
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Allowance: The prescribed difference between the design size and the basic size.
Angled Bottom: Bottom of the slot is angled.
Axis of Thread: The axis of the thread pitch cylinder.
Bearing Surface Radial Slots: Slots that are milled perpendicular to the axis of the part into the bearing surface.
Body Thickness: A reference dimension measured from the bearing surface to the base of the collar on the top of a part.
Broken Corner: Slight chamfer at slot corners.
Cease-hardened: A process by which only the surface area of the part is hardened to a specified depth.
Case Depth: Depth to which Re 58 minimum is maintained.
Chamfer: An external angular feature emanating perpendicular to the axis of the part.
Class of Thread 1: An alphanumerical designation to indicate the standard grade of tolerance and allowance specified for a thread. (see also Thread Fit)
Collar: A circular boss on the bearing surface or the top surface of a nut.
Concentricity: The permissible variation in the location of the axis (exact center) of a characteristic to the axis of another characteristic. The axis of the controlled characteristic must remain within a circular zone of a diameter equal to the concentricity limit.
Core Hardness: The measurement of the hardness of the center of the wall of a part.
Counterbore: A concentric diametric enlargement of a hole for part of its depth which forms an angular, radial or flat surface at the bottom.
Countersink: An angular beveling or flaring of the end(s) of a hole, outer edge of a counterbore, or at the bottom of a counterbore, that does not extend to the OD or counterbore diameter.
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