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[F1ANNEX IU.K.

CATEGORY 2 – MATERIALS PROCESSINGU.K.

[2A] Systems, Equipment and ComponentsU.K.

NB:For quiet running bearings, see the Military Goods Controls.U.K.

[2A001] Anti-friction bearings, bearing systems and components, as follows:

NB:SEE ALSO 2A101.U.K.
a.

Ball bearings and solid roller bearings, having all tolerances specified by the manufacturer in accordance with ISO 492 Tolerance Class 4 or Class 2 (or national equivalents), or better, and having both ‘rings’ and ‘rolling elements’, made from monel or beryllium;

Note:2A001.a. does not control tapered roller bearings.U.K.
Technical Notes:U.K.
1.‘Ring’ – annular part of a radial rolling bearing incorporating one or more raceways (ISO 5593:1997).U.K.
2.‘Rolling element’ – ball or roller which rolls between raceways (ISO 5593:1997).U.K.
b.

Not used;

c.

Active magnetic bearing systems using any of the following, and specially designed components therefor:

1.

Materials with flux densities of 2,0 T or greater and yield strengths greater than 414 MPa;

2.

All-electromagnetic 3D homopolar bias designs for actuators; or

3.

High temperature (450 K (177 °C) and above) position sensors.

[2A101] Radial ball bearings, other than those specified in 2A001, having all tolerances specified in accordance with ISO 492 Tolerance Class 2 (or ANSI/ABMA Std 20 Tolerance Class ABEC-9 or other national equivalents), or better and having all of the following characteristics:

a.

An inner ring bore diameter between 12 mm and 50 mm;

b.

An outer ring outside diameter between 25 mm and 100 mm; and

c.

A width between 10 mm and 20 mm.

[2A225] Crucibles made of materials resistant to liquid actinide metals, as follows:

a.

Crucibles having both of the following characteristics:

1.

A volume of between 150 cm3 and 8 000 cm3; and

2.

Made of or coated with any of the following materials, or combination of the following materials, having an overall impurity level of 2 % or less by weight:

a.

Calcium fluoride (CaF2);

b.

Calcium zirconate (metazirconate) (CaZrO3);

c.

Cerium sulphide (Ce2S3);

d.

Erbium oxide (erbia) (Er2O3);

e.

Hafnium oxide (hafnia) (HfO2);

f.

Magnesium oxide (MgO);

g.

Nitrided niobium-titanium-tungsten alloy (approximately 50 % Nb, 30 % Ti, 20 % W);

h.

Yttrium oxide (yttria) (Y2O3); or

i.

Zirconium oxide (zirconia) (ZrO2);

b.

Crucibles having both of the following characteristics:

1.

A volume of between 50 cm3 and 2 000 cm3; and

2.

Made of or lined with tantalum, having a purity of 99,9 % or greater by weight;

c.

Crucibles having all of the following characteristics:

1.

A volume of between 50 cm3 and 2 000 cm3;

2.

Made of or lined with tantalum, having a purity of 98 % or greater by weight; and

3.

Coated with tantalum carbide, nitride, boride, or any combination thereof.

[2A226] Valves having all of the following characteristics:

a.

A ‘nominal size’ of 5 mm or greater;

b.

Having a bellows seal; and

c.

Wholly made of or lined with aluminium, aluminium alloy, nickel, or nickel alloy containing more than 60 % nickel by weight.

Technical Note:U.K.

For valves with different inlet and outlet diameters, the ‘nominal size’ in 2A226 refers to the smallest diameter.]