Mechanical systems and components for general use

• Bearings

• Characteristics and design of machines, apparatus, equipment

• Fasteners

• Flexible drives and transmissions

• Gears

• Hinges, eyelets and other articulated joints

• Housings, enclosures, other machine parts

• Lubrication systems

• Rotary-reciprocating mechanisms and their parts

• Screw threads

• Seals, glands

• Shafts and couplings

• Springs