Said insertion parts (22') and openings are provided with an enlarged surface in relation to the core diameters thereof.

The MFD is a function of the core diameter, the wavelength of the laser, and the refractive index difference between the core and the cladding.

Multimode fibers have a relatively large core diameter (50 μm).

Both the core diameter and the outer diameter of the compression screw (4) are conically tapered from coronal to apical, at least in the apical area thereof.

The carbon nano-fibres may have an average diameter of around 0.2mm (200 x 10-9m) a length of from 10 to 20mm and an inner core diameter of from 65-70nm.

The invention relates to a mounting screw (1) for fastening a fitting part (11) on a hollow chamber profile (12), wherein the ratio between the head diameter and core diameter of the outer thread (6) lies between 1.2 and 1.3.

Between the head-anchoring section (6) and the shaft section is a second threaded section (4) which has the same core diameter as the head-anchoring section.

The cavity has, at each annular element, a profile with regions which are narrower and wider than the core diameter of the corresponding expansion screw.

The laser power amplifier is of greater core and cladding diameter than the oscillator or preamplifier, thus enabling lower brightness pump sources to be employed.

The elongate, hollow inner core has an inner core outer diameter that is less than or equal to the central lumen diameter.

An inner core (5) is fixed to a larger diameter outer core (10), the difference in diameter providing an abutment.

The core wires (12) have the same diameter.

The ground rotor core (20) is nested in the ground stator core inner bore (33), wherein the punched outer diameter of the rotor core (20) is equal to the punched diameter of inner bore (33) of the stator core (30).

The plunger weight can be reduced without reducing the plunger diameter.

A ratio of the root tooth diameter of the stator core to the outer diameter of the stator core is less than about 0.75.