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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

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

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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