Copy of `Industrial nut - Bolts glossary`

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Industrial nut - Bolts glossary
Category: General technical and industrial > glossary of nut terms
Date & country: 19/08/2008, US
Words: 49


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

Bearing Surface Radial Slots


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

Case Depth
Depth to which Rc 58 minimum is maintained

Case-hardened
A process by which only the surface area of the part is hardened to a specified depth

Chamfer
An external angular feature emanating perpendicular to the axis of the part

Class of Thread
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

EAU
Estimated annual usage

External Groove
A circular continuous channel cut into an external feature of a part

Face Groove
A circular continuous channel cut into the bearing or top surface of a part

Flange
A circular projection forming the outside diameter of a part

Flatness
The permissible variation of the flatness of a surface or characteristic

Horizontal Slots on the OD
Slots that are milled parallel to the bearing surface of the part into the OD

Horizontal Slots on the OD


Internal Groove
A circular continuous channel cut into an internal feature of a part

Major Diameter
Diameter of an imaginary cylinder that would bound the crests of an external straight thread or the roots of an internal straight thread

Micro
The measurement of the roughness of a surface in microinches of roughness height

Minor Diameter
The diameter of the threaded or unthreaded primary hole

Nominal Size
The designation which is used for the purpose of general identification

OD
Outside diameter

Parallelism
The permissible variation of the parallel relationship of the top surface diameter to the bearing surface diameter of a part

Perpendicularity
The permissible perpendicular variation of relationship between the bearing surface or the top surface and the axis of the thread (A.k.a. runout or TIR)

Radiused Corner
Slight radii at slot corners

Round Bottom
Bottom of the slot is rounded

Runout
The permissible perpendicular variation of relationship between the bearing surface or the top surface and the axis of the thread (A.k.a. TIR or perpendicularity)

Shape
The shape of the largest outside feature of the part

Slot
The following types of slots are typical for nuts:

Slot Span
The distance as measured from one slot bottom to the opposing slot bottom of a part with an even number of OD slots

Slot Width
The perpendicular distance measured between the parallel sides of the slot

Style
The description of the part as it fits in to a family classification of similar part designs or functions

Thickness
The distance from the bearing surface to the top surface measured parallel to the axis of the part

Thread Handedness
Whether the threads are right-handed or left-handed in orientation

Thread Series
Groups of diameter/pitch combinations distinguished from each other by the number of threads per inch applied to specific diameters

Through-hardened
A process by which the entire cross section of the part is hardened. A minimum core hardness may be specified

TIR
The permissible perpendicular variation of relationship between the bearing surface or the top surface and the axis of the thread (A.k.a. runout or perpendicularity)

Tolerance
The total amount of variation permitted for the size of a dimension

Top Radial Slots


Top Radial Slots
Slots that are milled perpendicular to the axis of the part into the top surface

Unslotted Thickness
The distance as measured from the bottom of the slot to either the bearing surface (for top radial slots) or the top surface (for bearing surface radial slots) of the part

Vertical Slots on the OD


Vertical Slots on the OD
Slots milled parallel to the axis of the part into the OD

Washer
A circular boss on the bearing surface or the top surface of a nut