Source: Roblox Creator Hub · CC BY 4.0 · View source · Code samples: MIT Imported 2026-10-03. Formatting adapted for this site.
TorsionSpringConstraint
Inherits from: Constraint → Instance → Object
A TorsionSpringConstraint applies a torque based on a relative angle and a relative angular velocity. Specifically, torsion springs try to bring two axes from two parts together in a compliant way.
Correct orientation of a torsion spring's attachments is important. The constraint will attempt to bring the SecondaryAxis of each attachment into alignment. When building mechanisms like swinging doors, ensure that the secondary axes are perpendicular to the intended axis of rotation.
When configuring this constraint, it may be helpful to study Roblox Units to understand how Roblox units compare to metric units.
Damping
The Damping value controls how fast the spring's oscillation dies down. A value of 0 allows the spring to oscillate endlessly, while higher values bring the spring to a rest more quickly.
Stiffness
Stiffness sets the torsional strength of the spring. Higher values create a spring that responds with more force.
Limits
Enabling the LimitsEnabled property exposes the MaxAngle value to restrict the spring's range within a cone; it also exposes the Restitution value which defines the elasticity of the attachments when they reach their limit.
Inherits from: Constraint
Memory category: BaseParts
Properties
| Name | Type / Returns | Description |
|---|---|---|
| TorsionSpringConstraint.Coils | float | The number of coils visualized for the constraint. |
| TorsionSpringConstraint.CurrentAngle | float | The current angle, in degrees, of the limiting cone. |
| TorsionSpringConstraint.Damping | float | Damping constant for the TorsionSpringConstraint. Multiplied to the velocity of the constraint's Attachments to reduce the spring force applied. |
| TorsionSpringConstraint.LimitEnabled | boolean | |
| TorsionSpringConstraint.LimitsEnabled | boolean | Limits the relative angular motion of the secondary axes of attachments through a cone constraint. |
| TorsionSpringConstraint.MaxAngle | float | The maximum angle of the constraint's limiting cone. |
| TorsionSpringConstraint.MaxTorque | float | The maximum allowable torque provided by the torsion spring. |
| TorsionSpringConstraint.Radius | float | The visualization radius of the spring. |
| TorsionSpringConstraint.Restitution | float | The restitution coefficient of the cone constraint. |
| TorsionSpringConstraint.Stiffness | float | The torsional stiffness of the spring. |
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 |
TorsionSpringConstraint.Coils
This property indicates the number of spring coils for visualization. Default value is 8.
| 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 |
TorsionSpringConstraint.CurrentAngle
The current angle, in degrees, of the torsion spring's limiting cone. The limiting cone is formed at the position of the constraint's Attachment0 around its secondary axis with an angle equal to MaxAngle.
| 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 |
TorsionSpringConstraint.Damping
Damping constant for the TorsionSpringConstraint. Multiplied to the velocity of the constraint's Attachments to reduce the spring force applied.
| Field | Value |
|---|---|
| type | float |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Spring |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
| simulationAccess | true |
TorsionSpringConstraint.LimitEnabled
Deprecated. This property is deprecated. Use LimitsEnabled instead.
| Field | Value |
|---|---|
| type | boolean |
| tags | ["Hidden","Deprecated"] |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Spring |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
| simulationAccess | true |
TorsionSpringConstraint.LimitsEnabled
This property, when enabled, limits the relative angular motion of the secondary axes of attachments through a cone constraint. The default value is false.
| Field | Value |
|---|---|
| type | boolean |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Spring |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
| simulationAccess | true |
TorsionSpringConstraint.MaxAngle
This property determines the maximum angle (in degrees) of the torsion spring's limiting cone. The limiting cone is formed at the position of the constraint's Attachment0 around its secondary axis with an angle equal to MaxAngle. Default value is 45 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 |
TorsionSpringConstraint.MaxTorque
This property determines the maximum torque supported by the torsion spring. Defaults to 1000.
| Field | Value |
|---|---|
| type | float |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Spring |
| serialization | {"can_load":true,"can_save":true} |
| capabilities | ["Physics"] |
| simulationAccess | true |
TorsionSpringConstraint.Radius
This property indicates the visualization radius of the spring, in studs. Default value is 0.4.
| 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 |
TorsionSpringConstraint.Restitution
This property defines how elastic Attachments connected by a TorsionSpringConstraint are when they reach the end of the range specified by MaxAngle, when LimitEnabled is true. The value defaults to 0 and can be any floating number within the range of 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 |
TorsionSpringConstraint.Stiffness
In the absence of damping, this property is proportional to the opposing torque of the spring. For instance, higher stiffness results in a larger opposing torque, and smaller stiffness results in a smaller opposing torque. The larger the torque value, the faster the axes are pushed together when the relative angle is positive (or away from each other if the relative angle is negative). The value defaults to 100.
| Field | Value |
|---|---|
| type | float |
| security | {"read":"None","write":"None"} |
| thread safety | ReadSafe |
| category | Spring |
| 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. |