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Source: Roblox Creator Hub · CC BY 4.0 · View source · Code samples: MIT Imported 2026-10-03. Formatting adapted for this site.

HingeConstraint

Inherits from: Constraint → Instance → Object

A HingeConstraint allows two Attachments to rotate about one axis, constraining the two Attachments so that they both occupy the same position and that their X axes point in the same direction.

Note that if this constraint attaches one part (A) to another part (B) that is anchored or connected to an anchored part (Z), part A will not be locally simulated when interacting with a player.

When configuring this constraint, it may be helpful to study Roblox Units to understand how Roblox units compare to metric units.

Angular Power

Hinges can be configured to actuate rotation. If a hinge's ActuatorType is set to Motor, it attempts to rotate the attachments with the goal of reaching its AngularVelocity. You can further control this rotation through both MotorMaxAcceleration and MotorMaxTorque. If a hinge's ActuatorType is set to Servo, it attempts to rotate to an angle specified by TargetAngle. This rotation is controlled by both AngularSpeed and ServoMaxTorque.

Limits

You can set limits to restrict the rotation of a hinge, useful for mechanisms like doors which should only swing open or closed within a set range. Enabling the LimitsEnabled property exposes the LowerAngle and UpperAngle limits, as well as Restitution which defines the elasticity of the attachments when they reach either limit.

Inherits from: Constraint

Memory category: BaseParts

Properties

Name	Type / Returns	Description
HingeConstraint.ActuatorType	ActuatorType	Sets whether the rotation of the `HingeConstraint` is actuated and, if so, what kind of actuation it uses.
HingeConstraint.AngularResponsiveness	float	Specifies the sharpness of the servo motor in reaching the `TargetAngle`.
HingeConstraint.AngularSpeed	float	The desired angular speed a `HingeConstraint` with `ActuatorType` set to `Servo` will attempt to maintain while rotating towards its `TargetAngle`. Measured in radians/second.
HingeConstraint.AngularVelocity	float	The angular velocity a `HingeConstraint` with `ActuatorType` set to `Motor` will attempt to achieve. Measured in radians/second.
HingeConstraint.CurrentAngle	float	The current angle of the `HingeConstraint`.
HingeConstraint.LimitsEnabled	boolean	Sets whether the `HingeConstraint` will limit the range of rotation.
HingeConstraint.LowerAngle	float	The minimum rotation angle the `HingeConstraint` will allow if `LimitsEnabled` is true.
HingeConstraint.MotorMaxAcceleration	float	The maximum angular acceleration a `HingeConstraint` with `ActuatorType` set to `Motor` can apply to achieve its `AngularVelocity`. Measured in radians/second².
HingeConstraint.MotorMaxTorque	float	The maximum torque a `HingeConstraint` with `ActuatorType` set to `Motor` can apply when trying to reach its desired `AngularVelocity`.
HingeConstraint.Radius	float	The visualized radius of the `HingeConstraint`.
HingeConstraint.Restitution	float	How elastic `Attachment` connected by a `HingeConstraint` will be when they reach the end of the range when `LimitsEnabled` is true. Constrained between 0 and 1.
HingeConstraint.ServoMaxTorque	float	The maximum torque a `HingeConstraint` with `ActuatorType` set to `Servo` can apply when trying to reach its desired `TargetAngle`.
HingeConstraint.SoftlockServoUponReachingTarget	boolean
HingeConstraint.TargetAngle	float	The target angle a `HingeConstraint` will attempt to rotate to if its `ActuatorType` is set to `Servo`. Measured in degrees.
HingeConstraint.UpperAngle	float	The maximum rotation angle the `HingeConstraint` will allow if `LimitsEnabled` is true.

Inherited from Constraint

Name	Type / Returns	Description
Constraint.Active	boolean	Indicates if the constraint is currently active in the world.
Constraint.Attachment0	Attachment	The `Attachment` that is connected to `Constraint.Attachment1`.
Constraint.Attachment1	Attachment	The `Attachment` that is connected to `Constraint.Attachment0`.
Constraint.Color	BrickColor	The color of the constraint.
Constraint.Enabled	boolean	Toggles whether or not the constraint is enabled.
Constraint.Visible	boolean	Toggles the constraint's visibility.

Inherited from Instance

Name	Type / Returns	Description
Instance.Archivable	boolean	Determines if an `Instance` and its descendants can be cloned using `Instance:Clone()`, and can be saved/published.
Instance.archivable	boolean
Instance.Capabilities	SecurityCapabilities	The set of capabilities allowed to be used for scripts inside this container.
Instance.IsInSandbox	boolean	Indicates whether the instance is inside a sandboxed container.
Instance.Name	string	A non-unique identifier of the `Instance`.
Instance.Parent	Instance	Determines the hierarchical parent of the `Instance`.
Instance.PredictionMode	PredictionMode	Reflects the client-side prediction mode applied to the instance under server-authoritative physics.
Instance.RobloxLocked	boolean	A deprecated property that used to protect `CoreGui` objects.
Instance.Sandboxed	boolean	When enabled, the instance can only access abilities in its `Capabilities` list.
Instance.UniqueId	UniqueId	A unique identifier for the instance.

Inherited from Object

Name	Type / Returns	Description
Object.ClassName	string	A read-only string representing the class this `Object` belongs to.
Object.className	string

HingeConstraint.ActuatorType

Sets whether the rotation of the HingeConstraint is actuated and, if so, what kind of actuation.

If ActuatorType is set to Motor, the hinge will attempt to rotate the attachments with the goal of reaching AngularVelocity. This rotation is limited by both MotorMaxAcceleration and MotorMaxTorque.
If ActuatorType is set to Servo, the hinge will attempt to rotate to an angle specified by TargetAngle. This rotation is limited by both AngularSpeed and ServoMaxTorque.

Note that both actuated and free spinning rotation can be limited by setting LimitsEnabled to true.

Field	Value
type	ActuatorType
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Hinge
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.AngularResponsiveness

This property specifies the sharpness of the servo motor in reaching the TargetAngle, when ActuatorType is set to Servo. Larger values correspond to a faster response and smaller values results in more damping and a slower response.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Servo
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.AngularSpeed

The desired angular speed a HingeConstraint with ActuatorType set to Servo will attempt to maintain while rotating towards its TargetAngle. Measured in radians/second.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Servo
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.AngularVelocity

The angular velocity a HingeConstraint with ActuatorType set to Motor will attempt to achieve. Measured in radians/second.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Motor
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.CurrentAngle

The current angle of the HingeConstraint. This angle is calculated by measuring the angle separation of the Y axes of the Attachments.

Field	Value
type	float
tags	["ReadOnly","NotReplicated"]
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Derived
serialization	{"can_load":false,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.LimitsEnabled

Sets whether the HingeConstraint will limit the range of rotation. If enabled, the constraint will only allow the CurrentAngle to be between LowerAngle and UpperAngle. If the Attachment reach the end of the limited range of rotation then they will stop rotating. If Restitution is greater than 0 then the attachments will bounce when they hit the ends of the limited range.

Field	Value
type	boolean
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Hinge
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.LowerAngle

The minimum rotation angle the HingeConstraint will allow if LimitsEnabled is true. Measured in degrees.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Limits
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.MotorMaxAcceleration

The maximum angular acceleration a HingeConstraint with ActuatorType set to Motor can apply to achieve its AngularVelocity. Measured in radians/second².

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Motor
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.MotorMaxTorque

The maximum torque a HingeConstraint with ActuatorType set to Motor can apply when trying to reach its desired AngularVelocity.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Motor
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.Radius

The visualized radius of the HingeConstraint.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Appearance
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.Restitution

How elastic Attachment connected by a HingeConstraint will be when they reach the end of the range when LimitsEnabled is true. Constrained between 0 and 1.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Limits
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.ServoMaxTorque

The maximum torque a HingeConstraint with ActuatorType set to Servo can apply when trying to reach its desired TargetAngle.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Servo
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.SoftlockServoUponReachingTarget

Deprecated. This property should not be used in new work.

Field	Value
type	boolean
tags	["Deprecated"]
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Servo
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.TargetAngle

The target angle a HingeConstraint will attempt to rotate to if its ActuatorType is set to Servo. Measured in degrees.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Servo
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

HingeConstraint.UpperAngle

The maximum rotation angle the HingeConstraint will allow if LimitsEnabled is true. Measured in degrees.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Limits
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

Methods

Inherited from Constraint

Name	Type / Returns	Description
Constraint:GetDebugAppliedForce	Vector3
Constraint:GetDebugAppliedTorque	Vector3

Inherited from Instance

Name	Type / Returns	Description
Instance:AddTag	()	Applies a tag to the instance.
Instance:children	Instances	Returns an array of the object's children.
Instance:ClearAllChildren	()	This method destroys all of an instance's children.
Instance:Clone	Instance	Create a copy of an instance and all its descendants, ignoring instances that are not `Archivable`.
Instance:clone	Instance
Instance:Destroy	()	Sets the `Instance.Parent` property to `nil`, locks the `Instance.Parent` property, disconnects all connections, and calls `Destroy()` on all children.
Instance:destroy	()
Instance:FindFirstAncestor	Instance?	Returns the first ancestor of the `Instance` whose `Instance.Name` is equal to the given name.
Instance:FindFirstAncestorOfClass	Instance?	Returns the first ancestor of the `Instance` whose `Object.ClassName` is equal to the given className.
Instance:FindFirstAncestorWhichIsA	Instance?	Returns the first ancestor of the `Instance` for whom `Object:IsA()` returns true for the given className.
Instance:FindFirstChild	Instance?	Returns the first child of the `Instance` found with the given name.
Instance:findFirstChild	Instance
Instance:FindFirstChildOfClass	Instance?	Returns the first child of the `Instance` whose `ClassName` is equal to the given class name.
Instance:FindFirstChildWhichIsA	Instance?	Returns the first child of the `Instance` for whom `Object:IsA()` returns true for the given className.
Instance:FindFirstDescendant	Instance?	Returns the first descendant found with the given `Instance.Name`.
Instance:GetActor	Actor?	Returns the `Actor` associated with the Instance, if any.
Instance:GetAttribute	Variant	Returns the value which has been assigned to the given attribute name.
Instance:GetAttributeChangedSignal	RBXScriptSignal	Returns an event that fires when the given attribute changes.
Instance:GetAttributes	Dictionary	Returns a dictionary of the instance's attributes.
Instance:GetChildren	Instances	Returns an array containing all of the instance's children.
Instance:getChildren	Instances
Instance:GetDebugId	string	Returns a coded string of the debug ID used internally by Roblox.
Instance:GetDescendants	Instances	Returns an array containing all of the descendants of the instance.
Instance:GetFullName	string	Returns a string describing the instance's ancestry.
Instance:GetStyled	Variant	Returns the styled or explicitly modified value of the specified property, or else the default property value if it hasn't been styled/modified.
Instance:GetStyledPropertyChangedSignal	RBXScriptSignal	Returns an event that fires when the given style property changes on the instance.
Instance:GetTags	Array	Gets an array of all tags applied to the instance.
Instance:HasTag	boolean	Check whether the instance has a given tag.
Instance:IsAncestorOf	boolean	Returns true if an `Instance` is an ancestor of the given descendant.
Instance:IsDescendantOf	boolean	Returns `true` if an `Instance` is a descendant of the given ancestor.
Instance:isDescendantOf	boolean
Instance:IsPropertyModified	boolean	Returns `true` if the value stored in the specified property is not equal to the code-instantiated default.
Instance:QueryDescendants	Instances	Returns an array containing all descendants of the instance that match the `selector` string.
Instance:Remove	()	Sets the object's `Parent` to `nil`, and does the same for all its descendants.
Instance:remove	()
Instance:RemoveTag	()	Removes a tag from the instance.
Instance:ResetPropertyToDefault	()	Resets a property to its default value.
Instance:SetAttribute	()	Sets the attribute with the given name to the given value.
Instance:WaitForChild	Instance	Returns the child of the `Instance` with the given name. If the child does not exist, it will yield the current thread until it does.

Inherited from Object

Name	Type / Returns	Description
Object:GetPropertyChangedSignal	RBXScriptSignal	Get an event that fires when a given property of the object changes.
Object:IsA	boolean	Returns true if an object's class matches or inherits from a given class.
Object:isA	boolean

Events

Inherited from Instance

Name	Type / Returns	Description
Instance.AncestryChanged		Fires when the `Instance.Parent` property of this object or one of its ancestors is changed.
Instance.AttributeChanged		Fires whenever an attribute is changed on the `Instance`.
Instance.ChildAdded		Fires after an object is parented to this `Instance`.
Instance.childAdded
Instance.ChildRemoved		Fires after a child is removed from this `Instance`.
Instance.DescendantAdded		Fires after a descendant is added to the `Instance`.
Instance.DescendantRemoving		Fires immediately before a descendant of the `Instance` is removed.
Instance.Destroying		Fires immediately before (or is deferred until after) the instance is destroyed via `Instance:Destroy()`.
Instance.StyledPropertiesChanged		Fires whenever any style property is changed on the instance, including when a property is set to `nil`.

Inherited from Object

Name	Type / Returns	Description
Object.Changed		Fires immediately after a property of the object changes, with some limitations.