• 21 MECHANICAL SYSTEMS AND COMPONENTS FOR GENERAL USE

• 21.020 Characteristics and design of machines

• 21.040 Screw threads

• 21.040.01 Screw threads in general

• 21.040.10 Metric screw threads

• 21.040.20 Inch screw threads

• 21.040.30 Special screw threads

• 21.060 Fasteners

• 21.060.01 Fasteners in general

• 21.060.01 Fasteners in general

• 21.060.10 Bolts

• 21.060.20 Nuts

• 21.060.30 Washers

• 21.060.40 Rivets

• 21.060.50 Pins

• 21.060.60 Rings

• 21.060.70 Clamps and staples

• 21.060.99 Other fasteners

• 21.080 Hinges

• 21.100 Bearings

• 21.100.01 Bearings in general

• 21.100.10 Plain bearings

• 21.100.20 Rolling bearings

• 21.120 Shafts and couplings

• 21.120.01 Shafts and couplings in general

• 21.120.10 Shafts

• 21.120.20 Couplings

• 21.120.30 Keys and keyways

• 21.120.40 Balancing and balancing machines

• 21.120.99 Other standards related to shafts and couplings

• 21.140 Seals

• 21.160 Springs

• 21.180 Housings

• 21.200 Gears

• 21.220 Flexible drives and transmissions

• 21.220.01 Flexible drives and transmissions in general

• 21.220.10 Belt drives and their components

• 21.220.20 Cable or rope drives and their components

• 21.220.30 Chain drives and their components

• 21.220.99 Other flexible drives and transmissions

• 21.240 Rotary-reciprocating mechanisms and their parts

• 21.260 Lubrication systems

           Last updated: 12/5/2001