Victorian Unsprung Rim Knobset

The Victorian Unsprung Rim Knobset is a face-fix mortice knobset designed with a Victorian style mushroom knob profile. It features an unsprung mechanism, which means the knob does not return to its original position automatically after operation. This knobset is available with a rose diameter of 56mm and a knob diameter of 52mm. The projection from the mounting surface is 70mm. The product is offered in multiple finishes, including Brass, Chrome Plate, and Satin Chrome.

This rim knobset is typically fitted to internal doors equipped with a rim lock or night latch that accepts a knob spindle and is compatible with face-fix installation methods. The unsprung design makes it suitable where the knob is used solely for operation of the latch without the need for spring return.

Key Features

• Rose diameter: 56mm
• Knob diameter: 52mm
• Projection: 70mm
• Unsprung mechanism (non-returning knob)
• Face-fix mounting style
• Available finishes: Brass, Chrome Plate, Satin Chrome
• Pack quantity: 1

Fitment & What to Check

Check the door preparation to ensure compatibility with face-fix knobs and rim locks or night latches that accept a spindle diameter matching this knobset. Confirm the rose diameter of 56mm fits within the door surface area available for mounting. Verify that the projection of 70mm is suitable for the door thickness and clearance. The unsprung knob does not return automatically, so confirm that the latch or lock mechanism operates correctly with this type of knob.

Common Ordering Mistakes

• Selecting a sprung knobset instead of an unsprung knobset when the latch requires a non-returning knob
• Ordering incorrect rose diameter or knob diameter that does not match the existing door or lock preparation
• Choosing a finish that does not match other door hardware components
• Neglecting to confirm spindle and lock compatibility with a rim knobset