# init(pin0:pin1:linearLimit:checksForInternalCollisions:) Creates a new prismatic joint. ``` init(pin0: GeometricPin, pin1: GeometricPin, linearLimit: ClosedRange? = nil, checksForInternalCollisions: Bool = false) ``` ## Parameters `pin0` The local position and orientation on the first entity. `pin1` The local position and orientation on the second entity. `linearLimit` A limit of the the translation of `pin1` from `pin0` in the direction of the x-axis of `pin0`. `checksForInternalCollisions` A Boolean that indicates whether the joint checks for collisions between the two [`Entity`](/documentation/RealityKit/Entity) instances. --- 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)