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.cursor/rules/roblox/physics/constraints/hinge.md
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---
title: Hinge
description: HingeConstraint allows its two attachments to rotate about one axis, with optional assigned power for motor or servo behavior.
---
<Alert severity="info">
For an overview on creating, visualizing, and simulating mechanical constraints, including `Class.HingeConstraint`, see [Mechanical constraints](../../physics/mechanical-constraints.md). Also see [Roblox&nbsp;units](../../physics/units.md) to understand how Roblox units compare to metric units.
</Alert>
A `Class.HingeConstraint`
allows its two attachments to rotate about one axis, forcing them into
the same position and **X** axis alignment. This constraint can also be
powered to behave like a [motor](#angular-power) or [servo](#angular-power), and you can set limits to restrict the hinge's rotational range.
<video controls src="../../assets/physics/constraints/Hinge-Demo.mp4" width="90%" alt="Demo video of HingeConstraint"></video>
<Alert severity="info">
Orientation of a hinge's attachments affects how it rotates. To ensure rotation occurs around the desired axis, each attachment's `Class.Attachment.Axis|Axis`, visualized by the yellow arrow, should point in the same direction.
</Alert>
### Angular power
If a hinge's `Class.HingeConstraint.ActuatorType|ActuatorType` is set to `Enum.ActuatorType|Motor`, it attempts to rotate the attachments with the goal of reaching its `Class.HingeConstraint.AngularVelocity|AngularVelocity`. You can further control this rotation through both `Class.HingeConstraint.MotorMaxAcceleration|MotorMaxAcceleration` and `Class.HingeConstraint.MotorMaxTorque|MotorMaxTorque`.
If a hinge's `Class.HingeConstraint.ActuatorType|ActuatorType` is set to `Enum.ActuatorType|Servo`, it attempts to rotate to an angle specified by `Class.HingeConstraint.TargetAngle|TargetAngle`. This rotation is controlled by both `Class.HingeConstraint.AngularSpeed|AngularSpeed` and `Class.HingeConstraint.ServoMaxTorque|ServoMaxTorque`.
<GridContainer numColumns="2">
<figure>
<video controls src="../../assets/physics/constraints/Hinge-ActuatorType-Motor.mp4" alt="Video showing angular power configured for motor behavior"></video>
<figcaption>ActuatorType = **Motor**</figcaption>
</figure>
<figure>
<video controls src="../../assets/physics/constraints/Hinge-ActuatorType-Servo.mp4" alt="Video showing angular power configured for servo behavior"></video>
<figcaption>ActuatorType = **Servo**</figcaption>
</figure>
</GridContainer>
### 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 `Class.HingeConstraint.LimitsEnabled|LimitsEnabled` property exposes the `Class.HingeConstraint.LowerAngle|LowerAngle` and `Class.HingeConstraint.UpperAngle|UpperAngle` limits, as well as `Class.HingeConstraint.Restitution|Restitution` which defines the elasticity of the attachments when they reach either limit.