ETA 1240 – interchangeable spare parts

ETA 1240 movement

Which spare parts fit the ETA 1240 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

2Parts with interchange data

5Calibers sharing parts

Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of ETA and the original spare-part labels. All information has been carefully checked but is provided without guarantee. Please verify the interchangeability yourself before fitting, especially the height, diameter and execution of the part.

🔧 Interchangeable parts

Part no.	Description	Also fits
407	Sliding pinion	according to original label ETA 2340 ETA 2345 ETA 2350 ETA 2355
710ISO 40.010	Pallet fork	FHF 75

Source: original interchangeability lists of ETA (checked transcription) and checked original spare-part labels · as of 2026-10-28. Height / execution: the part fits only in this height or execution.

🌀 Matching mainspring

Mainspring dimensions for ETA 1240 (height × diameter × thickness × length) and matching mainspring in our shop:

ETA 1240: 1.50 × 7.5 × 0.085 × 260 mm (GR 4087)

🔗 Movements sharing the most parts

→ All calibers of ETA

❓ Frequently asked questions

Which ETA 1240 spare parts also fit other movements?

For the ETA 1240, 2 part numbers are listed as interchangeable. Together they fit 5 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the ETA 1240?

The most shared parts: ETA 2340 (1 parts), ETA 2345 (1 parts), ETA 2350 (1 parts).

Which mainspring fits the ETA 1240?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.50 × 7.5 × 0.085 × 260 mm (GR 4087, hand-wound, normal end hook).