# PhysicsPrismaticJoint A joint that allows movement along a straight line, similar to a sliding drawer. ``` struct PhysicsPrismaticJoint ``` ## Overview `PhysicsPrismaticJoint`, also called a “slider joint”, allows one linear degree of freedom along the x-axis between two [`Entity`](/documentation/RealityKit/Entity) pins. > Tip: Pass an orientation when creating the ``doc://com.apple.RealityKit/documentation/RealityKit/GeometricPin`` instances to change the axis of rotation. ## Topics ### Initializers [`init(pin0: GeometricPin, pin1: GeometricPin, linearLimit: ClosedRange?, checksForInternalCollisions: Bool)`](/documentation/RealityKit/PhysicsPrismaticJoint/init(pin0:pin1:linearLimit:checksForInternalCollisions:)) Creates a new prismatic joint. ### Instance Properties [`var linearLimit: ClosedRange?`](/documentation/RealityKit/PhysicsPrismaticJoint/linearLimit) A limit of the translation between the pins in the direction of the x-axis. ## Relationships ### Conforms To [`Equatable`](/documentation/Swift/Equatable) [`PhysicsJoint`](/documentation/RealityKit/PhysicsJoint) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)