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A bolt circle diameter or pitch circle diameter (PCD), sometimes simply called bolt circle or pitch circle, is a common term for when a number of
/ref> Some racing wheels attach to the car via a quick release hub, and this hub then usually has a corresponding bolt circle of 6×70 mm. Example of other less used patterns include: 3×1.75 in (44.45 mm), 5×2.75 in (69.85 mm), 6×74 mm and 6×2.75 in (69.85 mm).
The mounting pattern of most car rims are described using bolt patterns, and this pattern is one of many factors which determine whether a rim will fit a given car. Here, the bolt circle indicates the number of wheel nuts and associated hub bolts (or alternatively just wheel bolts).
An example of a bolt circle is 5×100 which indicates 5 nuts placed on a circle with a diameter of 100 mm. Some of the most common bolt circle diameters on modern cars are 100 mm, 112 mm and 114.3 mm. The bolt circle of a car is one of several parameters that must be checked before buying new rims to make sure they will fit the car (along with wheel offset, hub diameter, and finally the diameter and width of the rim and tire). Over the years, over 30 different bolt circles patterns have been used by car manufacturers,Boltsirkel.no
/ref> most of which are not compatible with each other.
screw
A screw and a bolt (see '' Differentiation between bolt and screw'' below) are similar types of fastener typically made of metal and characterized by a helical ridge, called a ''male thread'' (external thread). Screws and bolts are used to fa ...
holes for bolts are evenly distributed with their centers along an imaginary circle with a given diameter
In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. It can also be defined as the longest chord of the circle. Both definitions are also valid for ...
.
An example of use is mounting of car rims, where the bolt circle is one of several factors that determine whether a set of rims will fit a car. For example, a bolt circle of 5×130 or 5-130 indicates that a rim is to be attached to the car via 5 screws evenly spaced along a circle with a diameter of 130 millimeters. Other common uses for bolt circles are for indicating mounting for sim racing
Simulated racing or racing simulation, commonly known as simply sim racing, are the collective terms for racing game software that attempts to accurately simulate auto racing, complete with real-world variables such as fuel usage, damage, tire ...
and real-world car steering wheels, or in the industry for mounting of servomotor
A servomotor (or servo motor) is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also r ...
s or for specifying the bolt pattern of a flange
A flange is a protruded ridge, lip or rim (wheel), rim, either external or internal, that serves to increase shear strength, strength (as the flange of an iron beam (structure), beam such as an I-beam or a T-beam); for easy attachment/transfer of ...
. Attachment of chain rings for bicycle crankset
The crankset (in the US) or chainset (in the UK), is the component of a bicycle drivetrain that converts the reciprocating motion of the rider's legs into rotational motion used to drive the chain or belt, which in turn drives the rear wheel. ...
s are also specified by a bolt circle.
Examples
Racing wheels
On steering wheels for cars utilizing bolt circles, this usually measures 6×70 mm.Steering Wheel Bolt Patterns Explained/ref> Some racing wheels attach to the car via a quick release hub, and this hub then usually has a corresponding bolt circle of 6×70 mm. Example of other less used patterns include: 3×1.75 in (44.45 mm), 5×2.75 in (69.85 mm), 6×74 mm and 6×2.75 in (69.85 mm).
Servomotors
Servomotor
A servomotor (or servo motor) is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also r ...
s in the industry are often mounted via a flange-like coupling to give the shortest possible leverage
Leverage or leveraged may refer to:
*Leverage (mechanics), mechanical advantage achieved by using a lever
* ''Leverage'' (album), a 2012 album by Lyriel
*Leverage (dance), a type of dance connection
*Leverage (finance), using given resources to ...
for high-torque uses. Industrial servomotors often use standardised mounting patterns, of which one example is a bolt circle of 4×130 mm diameter (approximately corresponds to a square pattern of 91.9 mm × 91.9 mm).
Car rims
The mounting pattern of most car rims are described using bolt patterns, and this pattern is one of many factors which determine whether a rim will fit a given car. Here, the bolt circle indicates the number of wheel nuts and associated hub bolts (or alternatively just wheel bolts).
An example of a bolt circle is 5×100 which indicates 5 nuts placed on a circle with a diameter of 100 mm. Some of the most common bolt circle diameters on modern cars are 100 mm, 112 mm and 114.3 mm. The bolt circle of a car is one of several parameters that must be checked before buying new rims to make sure they will fit the car (along with wheel offset, hub diameter, and finally the diameter and width of the rim and tire). Over the years, over 30 different bolt circles patterns have been used by car manufacturers,Boltsirkel.no/ref> most of which are not compatible with each other.
See also
* Pitch diameter, a dimension of a screw threadReferanser