NOTES FROM THE BENCH

Clock Repair Archive - -     Mainspring specs:

popular european mechanism mainspring specs in inches ( LISTED width X strength X length): 

#10 --- .669X .0177 X 58.6
#11 --- .669 X .0157 X 47.25
#20 --- .669 X .015 X 47.25
#21 --- .669 X .0157 X 47.25
#30 --- .472 X .0157 X 43.25
#31 --- .472 X .0134 X 45.25
#32 ---- .472 X .0165 X 43,25
#33 ---- .472 X .0126 X 45.25
#40 ---- .669 X .015 X 43.25
#41 ---- .827 X .0157 X 45.25
#42 ---- .669 X .0157 X 43.25
#50 ---- .669 X .0157 X 47.25
#52 ---- .669 X .0165 X 47.25
#54 ---- .827 X .0165 X 75
#55 ---- .827X .0177 X 71
#56 ---- .669 X .015 X 47.25
#57 ----.669 X .0126 X 59
These are approximate measurements : width and strength are plus or minus .0015 inches; and length is plus or minus .1 inch.


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