--- name: BallSocketConstraint last_updated: 2026-06-10T23:09:11Z inherits: - Constraint - Instance - Object type: class memory_category: BaseParts summary: "Forces its two attachments into the same position and allows them to freely rotate about all three axes, with optional limits to restrict both tilt and twist." --- # Class: BallSocketConstraint > Forces its two attachments into the same position and allows them to freely > rotate about all three axes, with optional limits to restrict both tilt and > twist. ## Description A `BallSocketConstraint` constrains its [Attachments](/docs/reference/engine/classes/Attachment.md) so that they occupy the same position. By default it allows both attachments to freely rotate about all of their axes, but if [LimitsEnabled](/docs/reference/engine/classes/BallSocketConstraint.md) is `true`, the attachments can only rotate in a limited cone. 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](/docs/en-us/physics/units.md) to understand how Roblox units compare to metric units. #### Limits You can set limits to restrict both **tilt** and **twist** of a ball socket, similar to how a human's head can tilt and turn within a limited axial range. Enabling the [LimitsEnabled](/docs/reference/engine/classes/BallSocketConstraint.md) property exposes the [UpperAngle](/docs/reference/engine/classes/BallSocketConstraint.md) value to restrict **tilt** within a cone; it also exposes the [TwistLimitsEnabled](/docs/reference/engine/classes/BallSocketConstraint.md) property which, when enabled, lets you restrict **twist** rotation through the [TwistLowerAngle](/docs/reference/engine/classes/BallSocketConstraint.md) and [TwistUpperAngle](/docs/reference/engine/classes/BallSocketConstraint.md) limits. ## Properties ### Property: BallSocketConstraint.LimitsEnabled ```json { "type": "boolean", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "BallSocket", "capabilities": [ "Physics" ], "simulationAccess": true } ``` Sets whether the `BallSocketConstraint` has a limit on rotation based on [UpperAngle](/docs/reference/engine/classes/BallSocketConstraint.md). When `true`, it enforces that its [Attachment1](/docs/reference/engine/classes/Constraint.md) isn't rotated more than a set angle from its [Attachment0](/docs/reference/engine/classes/Constraint.md). ### Property: BallSocketConstraint.MaxFrictionTorque ```json { "type": "float", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": false, "can_save": false }, "thread_safety": "ReadSafe", "category": "Friction", "capabilities": [ "Physics" ], "simulationAccess": true } ``` Sets the maximum frictional torque applied to keep its [Attachments](/docs/reference/engine/classes/Attachment.md) aligned. `MaxFrictionTorque` specifies the stiffness of the `BallSocketConstraint` (how much it resists rotation around its [Attachments](/docs/reference/engine/classes/Attachment.md)). ### Property: BallSocketConstraint.Radius ```json { "type": "float", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "Appearance", "capabilities": [ "Physics" ], "simulationAccess": true } ``` The visualized radius of the `BallSocketConstraint`. ### Property: BallSocketConstraint.Restitution ```json { "type": "float", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "Limits", "capabilities": [ "Physics" ], "simulationAccess": true } ``` How elastic [Attachments](/docs/reference/engine/classes/Attachment.md) connected by a `BallSocketConstraint` will be when they reach the end of the range specified by [UpperAngle](/docs/reference/engine/classes/BallSocketConstraint.md) when [LimitsEnabled](/docs/reference/engine/classes/BallSocketConstraint.md) is `true`. Constrained between 0 and 1. ### Property: BallSocketConstraint.TwistLimitsEnabled ```json { "type": "boolean", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "Limits", "capabilities": [ "Physics" ], "simulationAccess": true } ``` Sets whether the `BallSocketConstraint` sets a limit on twist rotation based on [TwistUpperAngle](/docs/reference/engine/classes/BallSocketConstraint.md) and [TwistLowerAngle](/docs/reference/engine/classes/BallSocketConstraint.md). The twist angle is defined as the angle between the **Y** axis of [Attachment1](/docs/reference/engine/classes/Constraint.md) and the **Y** axis of [Attachment0](/docs/reference/engine/classes/Constraint.md). ### Property: BallSocketConstraint.TwistLowerAngle ```json { "type": "float", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "TwistLimits", "capabilities": [ "Physics" ], "simulationAccess": true } ``` Sets the lower twist rotation limit of the `BallSocketConstraint`, as long as [TwistLimitsEnabled](/docs/reference/engine/classes/BallSocketConstraint.md) is `true`. ### Property: BallSocketConstraint.TwistUpperAngle ```json { "type": "float", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "TwistLimits", "capabilities": [ "Physics" ], "simulationAccess": true } ``` Sets the upper twist rotation limit of the `BallSocketConstraint`, as long as [TwistLimitsEnabled](/docs/reference/engine/classes/BallSocketConstraint.md) is `true`. ### Property: BallSocketConstraint.UpperAngle ```json { "type": "float", "access": "ReadWrite", "security": { "read": "None", "write": "None" }, "serialization": { "can_load": true, "can_save": true }, "thread_safety": "ReadSafe", "category": "Limits", "capabilities": [ "Physics" ], "simulationAccess": true } ``` Sets the upper rotation limit of the `BallSocketConstraint`, as long as [LimitsEnabled](/docs/reference/engine/classes/BallSocketConstraint.md) is `true`. ## Inherited Members ### From [Constraint](/docs/reference/engine/classes/Constraint.md) - **Property `Active`** (`boolean`): Indicates if the constraint is currently active in the world. - **Property `Attachment0`** (`Attachment`): The Attachment that is connected to - **Property `Attachment1`** (`Attachment`): The Attachment that is connected to - **Property `Color`** (`BrickColor`): The color of the constraint. - **Property `Enabled`** (`boolean`): Toggles whether or not the constraint is enabled. - **Property `Visible`** (`boolean`): Toggles the constraint's visibility. - **Method `GetDebugAppliedForce(bodyId: int): Vector3`**: *(deprecated)* - **Method `GetDebugAppliedTorque(bodyId: int): Vector3`**: *(deprecated)* ### From [Instance](/docs/reference/engine/classes/Instance.md) - **Property `Archivable`** (`boolean`): Determines if an Instance and its descendants can be cloned using - **Property `archivable`** (`boolean`): *(deprecated, hidden)* - **Property `Capabilities`** (`SecurityCapabilities`): The set of capabilities allowed to be used for scripts inside this - **Property `Name`** (`string`): A non-unique identifier of the Instance. - **Property `Parent`** (`Instance`): Determines the hierarchical parent of the Instance. - **Property `PredictionMode`** (`PredictionMode`): - **Property `RobloxLocked`** (`boolean`): A deprecated property that used to protect CoreGui objects. *(hidden)* - **Property `Sandboxed`** (`boolean`): When enabled, the instance can only access abilities in its `Capabilities` - **Property `UniqueId`** (`UniqueId`): A unique identifier for the instance. - **Method `AddTag(tag: string): ()`**: Applies a tag to the instance. - **Method `children(): Instances`**: Returns an array of the object's children. *(deprecated)* - **Method `ClearAllChildren(): ()`**: This method destroys all of an instance's children. - **Method `Clone(): Instance`**: Create a copy of an instance and all its descendants, ignoring instances - **Method `clone(): Instance`**: *(deprecated)* - **Method `Destroy(): ()`**: Sets the Instance.Parent property to `nil`, locks the - **Method `destroy(): ()`**: *(deprecated)* - **Method `FindFirstAncestor(name: string): Instance?`**: Returns the first ancestor of the Instance whose - **Method `FindFirstAncestorOfClass(className: string): Instance?`**: Returns the first ancestor of the Instance whose - **Method `FindFirstAncestorWhichIsA(className: string): Instance?`**: Returns the first ancestor of the Instance for whom - **Method `FindFirstChild(name: string, recursive?: boolean): Instance?`**: Returns the first child of the Instance found with the given name. - **Method `findFirstChild(name: string, recursive?: boolean): Instance`**: *(deprecated)* - **Method `FindFirstChildOfClass(className: string): Instance?`**: Returns the first child of the Instance whose - **Method `FindFirstChildWhichIsA(className: string, recursive?: boolean): Instance?`**: Returns the first child of the Instance for whom - **Method `FindFirstDescendant(name: string): Instance?`**: Returns the first descendant found with the given Instance.Name. - **Method `GetActor(): Actor?`**: Returns the Actor associated with the Instance, if any. - **Method `GetAttribute(attribute: string): Variant`**: Returns the value which has been assigned to the given attribute name. - **Method `GetAttributeChangedSignal(attribute: string): RBXScriptSignal`**: Returns an event that fires when the given attribute changes. - **Method `GetAttributes(): Dictionary`**: Returns a dictionary of the instance's attributes. - **Method `GetChildren(): Instances`**: Returns an array containing all of the instance's children. - **Method `getChildren(): Instances`**: *(deprecated)* - **Method `GetDebugId(scopeLength?: int): string`**: Returns a coded string of the debug ID used internally by Roblox. - **Method `GetDescendants(): Instances`**: Returns an array containing all of the descendants of the instance. - **Method `GetFullName(): string`**: Returns a string describing the instance's ancestry. - **Method `GetStyled(name: string, selector: string?): Variant`**: Returns the styled or explicitly modified value of the specified property, - **Method `GetStyledPropertyChangedSignal(property: string): RBXScriptSignal`**: - **Method `GetTags(): Array`**: Gets an array of all tags applied to the instance. - **Method `HasTag(tag: string): boolean`**: Check whether the instance has a given tag. - **Method `IsAncestorOf(descendant: Instance): boolean`**: Returns true if an Instance is an ancestor of the given - **Method `IsDescendantOf(ancestor: Instance): boolean`**: Returns `true` if an Instance is a descendant of the given - **Method `isDescendantOf(ancestor: Instance): boolean`**: *(deprecated)* - **Method `IsPropertyModified(property: string): boolean`**: Returns `true` if the value stored in the specified property is not equal - **Method `QueryDescendants(selector: string): Instances`**: - **Method `Remove(): ()`**: Sets the object's `Parent` to `nil`, and does the same for all its *(deprecated)* - **Method `remove(): ()`**: *(deprecated)* - **Method `RemoveTag(tag: string): ()`**: Removes a tag from the instance. - **Method `ResetPropertyToDefault(property: string): ()`**: Resets a property to its default value. - **Method `SetAttribute(attribute: string, value: Variant): ()`**: Sets the attribute with the given name to the given value. - **Method `WaitForChild(childName: string, timeOut: double): Instance`**: Returns the child of the Instance with the given name. If the - **Event `AncestryChanged`**: Fires when the Instance.Parent property of this object or one of - **Event `AttributeChanged`**: Fires whenever an attribute is changed on the Instance. - **Event `ChildAdded`**: Fires after an object is parented to this Instance. - **Event `childAdded`**: *(deprecated)* - **Event `ChildRemoved`**: Fires after a child is removed from this Instance. - **Event `DescendantAdded`**: Fires after a descendant is added to the Instance. - **Event `DescendantRemoving`**: Fires immediately before a descendant of the Instance is removed. - **Event `Destroying`**: Fires immediately before (or is deferred until after) the instance is - **Event `StyledPropertiesChanged`**: Fires whenever any style property is changed on the instance, including ### From [Object](/docs/reference/engine/classes/Object.md) - **Property `ClassName`** (`string`): A read-only string representing the class this Object belongs to. - **Property `className`** (`string`): *(deprecated)* - **Method `GetPropertyChangedSignal(property: string): RBXScriptSignal`**: Get an event that fires when a given property of the object changes. - **Method `IsA(className: string): boolean`**: Returns true if an object's class matches or inherits from a given class. - **Method `isA(className: string): boolean`**: *(deprecated)* - **Event `Changed`**: Fires immediately after a property of the object changes, with some