NEW Hermle Mainspring

This is for one brand new Hermle mainspring that can go inside a Hermle barrel. Please carefully read the chart below so you can choose the right size in the drop down menu above.

Barrel No.

Mainspring Size

Inches and Metric

#10

43/64 x .0175 x 58-5/8”

(17 x .45 x 1490mm)

#11

43/64 x .0165 x 59-1/16”

(17 x .42 x 1500mm)

#20 & 56

(same size)

43/64 x .0150 x 47-1/4”

(17 x .38 x 1200mm)

#21 & 50

(same size)

43/64 x .0155 x 47-1/4”

(17 x .40 x 1200mm)

#31

15/32 x .0133 x 45-1/4”

(12 x .34 x 1150mm)

#30 & 32

(same size)

15/32 x .0165 x 43-5/16”

(12 x .42 x 1100mm)

#33

15/32 x .0120 x 45-1/4”

(12 x .32 x 1150mm)

#40 & 42

(same size)

43/64 x .0150 x 43-5/16”

(17 x .38 x 1100mm)

#41

53/64 x .0155 x 61”

(21 x .40 x 1550mm)

#52

43/64 x .0165 x 47-1/4”

(17 x .42 x 1200mm)

#54

53/64 x .0165 x 74-13/16”

(21 x .42 x 1900mm)

#55

53/64 x .0175 x 70-7/8”

(21 x .45 x 1800mm)

#57

43/64 x .0120 x 59-1/16”

(17 x .32 x 150­­0mm)


We do combine purchases to save on shipping as long as they are made on the same day. Please email me for combined shipping rates on multiple items and allow 24 hours for us to send you a combined invoice with your total. We do ship worldwide and always TRY to ship the same day payment is received. Items must be returned in original condition or it will not be accepted. A refund of the purchase price will be given. Shipping is non-refundable unless the mistake is ours. Make sure you order the correct size on your items so you don't have to send them back or exchange them. We are more than willing to help you get what you need. Please call or email us with any concerns or questions before leaving feedback. We care about our customers and will work with you on any issue. If you refuse to communicate with us we will have to block you from buying from us again. Thank you.