Division Systems, Equipment and Components

2A001Anti-friction bearings, bearing systems and components, as follows:

1. 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.

   Technical Notes:

   1.

   ‘Ring’ – annular part of a radial rolling bearing incorporating one or more raceways (ISO 5593:1997).

   2.

   ‘Rolling element’ – ball or roller which rolls between raceways (ISO 5593:1997).

2. b..

   Not used;

3. c..

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

   1. 1..

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

   2. 2..

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

   3. 3..

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

2A101Radial 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:

1. a..

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

2. b..

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

3. c..

   A width between 10 mm and 20 mm.

2A225Crucibles made of materials resistant to liquid actinide metals, as follows:

1. a..

   Crucibles having both of the following characteristics:

   1. 1..

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

   2. 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:

      1. a..

         Calcium fluoride (CaF₂);

      2. b..

         Calcium zirconate (metazirconate) (CaZrO₃);

      3. c..

         Cerium sulphide (Ce₂S₃);

      4. d..

         Erbium oxide (erbia) (Er₂O₃);

      5. e..

         Hafnium oxide (hafnia) (HfO₂);

      6. f..

         Magnesium oxide (MgO);

      7. g..

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

      8. h..

         Yttrium oxide (yttria) (Y₂O₃); or

      9. i..

         Zirconium oxide (zirconia) (ZrO₂);

2. b..

   Crucibles having both of the following characteristics:

   1. 1..

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

   2. 2..

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

3. c..

   Crucibles having all of the following characteristics:

   1. 1..

      A volume of between 50 cm³ and 2 000 cm³;

   2. 2..

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

   3. 3..

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

2A226Valves having all of the following characteristics:

1. a..

   A ‘nominal size’ of 5 mm or greater;

2. b..

   Having a bellows seal; and

3. c..

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