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Balance hairspring with roller for watch movements NIVAROX - New old stock

Category: Hairsprings

Movement size/Balance diameter

€ 29,95

including VAT. , plus shipping

Available now!

There are variations of this item. Please select the variation you wish.


Balance spring for watches with Swiss pallet escapement

Non-magnetic beryllium alloy NIVAROX
Dimensions: Movement size in Lignes/inner balance rim diameter in mm

Instructions:
1. measure inner balance rim diameter
2. determine beat rate
3. multiply balance rim diameter by beat factor
4. select suitable coil spring

Beat factor:
18000/h => 1,000
19800/h => 0,909
21600/h => 0,833
28800/h => 0,625
36000/h => 0,563

Example:
Measured inner balance rim diameter: 11.3 mm
Beat rate 21600/h => 0,833
11.3 mm x 0.833 = 9.41 mm

The best fitting coil spring is therefore: 8 3/4'''-9.4 mm

Please note: This is a raw hairspring that needs to be modified and regulated.


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