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SCREWS & EYELETS
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| Why can't I get an eyelet to fit this screw? |
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Standard Quality / 5-40 with Brass Eyelet
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per 10
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| SELSQ1 |
Violin
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26.00 |
| SELSQ2 |
Viola |
27.00 |
| SELSQ3 |
Cello |
30.00 |
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per 5 |
| SELSQ4 |
Bass, standard 4mm |
20.00 |
| SELSQ5 |
Bass, heavy 4.5mm |
42.00 |
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Highest Quality - 5-40
Stainless Screws, Bronze Eyelets
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per 10 |
| SELHQ1 |
Violin |
75.00 |
| SELHQ2 |
Viola |
80.00 |
| SELHQ3 |
Cello |
90.00 |
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per 5 |
| SELHQ4 |
Bass, 4mm |
105.00 |
SCREWS BLANKS WITH TANGS AND LEADS UNCUT
Without Eyelet
Half-threaded, half-unthreaded, total length 80mm. Allows you to control the length and position of the threads as well as the length of pilot and tang. Eyelets not included
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Standard 5-40
Long enough for violin, viola or cello. Any of the 5-40 eyelets will work with these screws
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per 10 |
| SEBST5-40 |
Violin, Viola or Cello
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45.00 |
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| SEBSS5-40 |
Violin, Viola or Cello
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75.00 |
Titanium 5-40
Over 1 gram lighter
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| SEBTI5-40 |
Violin, Viola or Cello
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107.00 |
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BowWorks Screw Blanks
The new BowWorks bow screws are here!
After over 150 years of bow screws being compromised, (by adopting the standardized thread form that was designed for the purpose of fastening, as opposed to transverse transport, and abandoning the tradition of custom designing a thread form for the job at hand) my years of studying bow screws and thread forms, has finally paid off.
We are delighted to introduce a thread form just for the purpose of moving a bow frog back and forth against the tension of the bow hair. Our first offering is available in screws of stainless or titanium, with eyelets of bronze, in lengths for violin/viola and cello. The pitch is .8 mm (31.74tpi) with a shaft size of 3.2mm (.126”) and an overall crest to crest diameter of 3.1 mm. The back end is left unfinished so you can cut them to length, and file in the flats where they are needed. The front is turned down so if you are lathe-less, you can use them as they come, otherwise you have plenty of threads to cut back so that they just fit the mortise.
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| BowWorks Stainless Screw Blank .8mm on a 3.2mm shaft (use eyelets E1SBW.8 or E3SBW.8) |
| SEBCC.8 |
Violin, Cello
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57.50 |
| BowWorks Titanium Screw Blank .8mm on a 3.2mm shaft (use eyelets E1SBW.8 or E3SBW.8) |
| SEBCC.8 |
Violin, Cello
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114.00 |
 Why do eyelets wear out?
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. But what we need 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. As can be seen from the thread at the bottom right, once upon a time using the right thread form for the job was understood. 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 being made of the finest material our eyelets 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.
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EYELETS of Brass & Bronze
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| Violin Brass |
Per 10
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| E1S54 |
5-40 threads, standard shank |
12.50 |
| E1T54 |
5-40 threads, thick shank |
27.00 |
| E1S00 |
without threads, standard shank |
12.50 |
| E1T00 |
without threads, thick shank |
27.00 |
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Violin Bronze
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| E1S54HQ |
5-40 threads, standard shank |
45.00 |
| E1T54HQ |
5-40 threads, thick shank |
68.00 |
| E1S00HQ |
without threads, standard shank |
48.00 |
| E1T00HQ |
without threads, thick shank |
68.00 |
| ES1BW.8 |
BowWorks violin |
55.00 |
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Cello Brass
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| E3S54 |
5-40 threads, standard shank |
14.50 |
| E3T54 |
5-40 threads, thick shank |
29.50 |
| E3S00 |
without threads, standard shank |
14.50 |
| E3T00 |
without threads, thick shank |
29.50 |
| Cello Bronze |
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| E354HQ |
5-40 threads, standard shank |
55.00 |
| E3T54HQ |
5-40 threads, thick shank |
72.00 |
| E3S00HQ |
without threads, standard shank |
55.00 |
| E3T00HQ |
without threads, thick shank |
72.00 |
| E3SBW.8 |
BowWorks cello |
67.50 |
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Bass
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per 5 |
| E440 |
Brass, standard 4mm |
17.00 |
| E440HQ |
Bronze, standard 4mm |
58.00 |
| E4HD |
Brass, heavy 4.5mm |
20.00 |
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Why can't I get an eyelet to fit this screw?
People often call and want to know where they can find an eyelet for such and such a screw. Or they want to know where they can buy a bunch of taps so they will always be prepared. The history of measurement standards really is a fascinating story, so I will do my best with the space and time available.
To start with, to have a standard thread you need to have a standard measure. In England King Henry did a good job in the 13th century using his body parts. These remained as standards until England went Metric in the 1960s. Although England was the exception, France also has inches and feet, along with other units, but no one could agree on whose foot to use, with every region and sometimes every village having it's own standards. This problem was made even worse in the late middle ages when the size of a man's foot was related to another, unrelated part of his anatomy, causing some Rulers to exaggerate and sometimes even outright lie about the size of their "foot", until, finally all Rulers claimed to be 12 inches-- a claim not supported by modern science-- So, During the French Revolution it was ordered to find another standard, a "natural one." They decided to take the distance from the North Pole to the Equator (as it passed through Paris, of course) as best as it could be measured in those days and then take one ten-millionth of that and call it the "Metre" The metric system was discarded in France in 1812, reinstated in 1840 with most of Europe adopting it by the late 1870s. This did not mean that trades people threw out their old measuring or thread-cutting tools at that time. It should be kept in mind that adopting a system of measurement is different from wide-spread acceptance and use. Meanwhile, back to the screw-thread.
In the mid-19th Century almost every factory and manufacturer had it's own design of screw thread and, consequently, fasteners were often made specially for the job at hand. This meant that compatibility and interchangeability between companies was just about non-existent. The first standardized threads were introduced in 1841 by Sir Whitworth and were based on the English Foot and inch system. In 1864 an American, totally agreeing with Sir Whitworth about the need for a standardized thread, introduced his own, again based on the inch-foot, the SAE or American Standard. By 1884 in Britain the BA thread form was introduced to be used on smaller screws. It wasn't until 1947 that the ISO was created to standardize the Metric thread. In 1966 the BA was discarded in favor of the Metric standard. Oops, almost out of space, But I think you are starting to get the idea.
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