Violin Bow Screws and Eyelets
It wasn’t until 1841 that the first thread standard was introduced by Sir Joseph Witworth, and not until 1857 that this standard had sizes that went down to sizes that could be used in bows.
In the 1860’s, the American John Sellers introduced another standard that was the basic for what is now the UNC/ UNF and the metric ISO thread form. These thread forms are best suited for a general purpose fastener. The 60 degree combined angle gives high friction, helping resist threads working loose, and the rough cut threads and sharp edges aren’t a problem since the fastener is not tightened and loosened every day.
What is needed in a bow is a thread form for repeated lateral transport, with steep angles for low friction and polished rounded crests and valleys, to avoid cutting into the softer metal of the eyelet when the screw and eyelet become out of alignment with each other. We feel confident that our new bow screws are the right thread form for the job and will also still be in service 200 years form now.
Our new eyelets, in addition to being made of the finest material also have tapered male threads to aid in the starting of the eyelet into the frog, as well as having a centered dimple to be used with a tap guide.