DESIGN CRITERIA

All PREFAG movements have been used
for decades in most critical physical environments like:

Aviation

Helicopters

Civil and commercial jets

Propeller aircrafts

Commercial/military supersonic flight equipment

Ship applications (vibration and shock)

Railroad (repetitive bumps)

Textile machinery (extremely high vibration)

For these high-end applications all our movements are equipped with:

Spring-backed sapphire jewels

Top quality tungsten carbide pivots

For non-vibration sensitive pointers

Copper coil formers for high damping are available

Mechanical self-centering pivot holding system, for best alignment and avoidance of adhesion

PREFAG zero adjustment for a play-free self-locking jewel screw positioning without counter nut or adding adhesive.

PREFAG welded hair springs for controlled torque and secure hairspring position, to avoid the overheating of the springs and a changed hysteresis.