When your mechanical clock needs to be wound, you need a clock key. The easiest way to determine what size key you need is to measure it. This guide will show you how to measure your clock for a clock key.
On the back of your clock is the winding arbor (the steel shaft the key fits on to). With your digital gauge, measure the square shaft from flat side to flat side to get the millimeter size. Most winding arbors taper out towards the the clock and the end section is most likely the smallest. This helps to make the selection of the key size a little less critical, as the key will slide onto the shaft until it reaches the ideal point.
You can either order from that size or use this chart to find the clock key # that corresponds to your size.
A 7 key is shown as 400mm but I have bought 7 keys that are about 370 mm.
Are there two systems defining key dimensions and related sizes?
I believe there are american and metric measuring systems out there. If you buy from us the #7 key is a 4.00mm key.
Looking for a key to fit a Minneapolis Honeywell 8 day 7 jewel model 77 clock, along with maintenance instructions.
I’d appreciate any suggestions
seriously….who has a digital gauge lying around? what is the alternative
Hello, I am seeking a replacement key for a Seth Thomas Sonora five bell chime. Can you someone else me what what to buy? I will would be grateful. Thank you.
Hello, or should I say help?
I have a replica Regulator Schoolhouse clock, made in China and it’s about 8-10 years old. Lost the key about a week ago and I need a replacement. I can not get into the back of the mechanism without taking the wood case apart. Does anyone have any idea of what size key it takes. 31 day movement, no name for the maker, just “made in China”. Many thanks in advance.
I have a Seth Thomas ships bell clock. I brought it in the 70’s. The key fits inside a small opening. I have
brought a key with 5 different sizes in one and none of them fit.
I need help I purchased a Seth Thomas Anniversary clock not realizing it needed a key name dignity model#0794-000 what size key would it need? Thanks for any help
I would like to know how to wind my Regulator A chime clock, “front wind” . I was given this without instructions or a key (got a #9 replacement measured 4.54mm?) Help please!
The windup key is missing (thanks to a grandchild) for a Seth Thomas Westminister Chime mantel clock. CAT #9562-001, Woodbury. B Franz Hermie 340-020. What size key does it require. Thank you.
We are not able to give that information as we do not have a cross reference guide for clocks. You will have to measure to find the size key you will need.
I have a VAP Brevete mantelpiece clock and the key has gone missing. Tried getting winder but they all seem to big. Please could you help me with where I could get one.
I have misplaced a double-ended key for our Sessions mantel clock. It seems like the larger end is slightly over 3 mm (#4), but the smaller end is really small, very close to 1 mm. A smaller end on the original brass key was extruding perhaps to support the smaller end.
I could not find any #4/1 mm keys (most end up like #4/00000 size).
Is it possible the smaller end to be really that small?
I have a welby German made Starburst clock. Can anyone help if I submit a pic?