Can the 8K knob be installed on a 9K chassis? February 19, 2026 00:31 Updated AnswerNo. The 8K chassis is different than the 9K chassis and the two are not compatible. Applies To9K chassis, 8K knob Related articles What lubricant can I use for the Key Combinator? 45H & 47H Mortise Locks Templates, Installation Instructions & Specifications What is the Part Number for the 40H Trim Cassettes 9K Grade 1 Cylindrical Locks Templates, Installation Instructions & Specifications How to Order: 45H Series Mortise Locks with Visual Indicator