Keys Clock Brass. Sizes from # 000- # 15. Due to the age and nature of wear and tear on the clock associated with the ordering of clock keys we do not warrantee the exact fit of clock keys ordered online. Cape Tools will only guarantee the fit if the clock is presented in store and we are able to physically match and verify the correct size to your clock. Below are approximate dimensions of the numbered system of the manufacturer. Clock key sizing chart Shaft width / Key # 1.75mm = 000 Key 2.0mm = 00 Key 2.25mm = 0 Key 2.50mm = 1 Key 2.75mm = 2 Key 3.0mm = 3 Key 3.25mm = 4 Key 3.50mm = 5 Key 3.75mm = 6 Key 4.0mm = 7 Key 4.25mm = 8 Key 4.50mm = 9 Key 4.75mm = 10 Key 5.00mm = 11 Key 5.25mm = 12 Key 5.50mm = 13 Key 5.75mm = 14 Key 6.0mm = 15 Key Clock Key Winders March 17th, 2026Terri
