| HCC | Description |
| A1 | Radioactive, Licensed |
| A2 | Radioactive, License Exempt |
| A3 | Radioactive, License Exempt, Authorized |
| B1 | Alkali, Corrosive, Inorganic |
| B2 | Alkali, Corrosive, Organic |
| B3 | Alkali, Low Risk |
| C1 | Acid, Corrosive, Inorganic |
| C2 | Acid, Corrosive, Organic |
| C3 | Acid, Low Risk |
| C4 | Acid, Corrosive and Oxidizer, Inorganic |
| C5 | Acid, Corrosive and Oxidizer, Organic |
| D1 | Oxidizer |
| D2 | Oxidizer and Poison |
| D3 | Oxidizer and Corrosive, Acidic |
| D4 | Oxidizer and Corrosive, Alkali |
| E1 | Explosive, Military |
| E2 | Explosive, Low Risk |
| F1 | Flammable Liquid, DOT Packing Group I, OSHA IA |
| F2 | Flammable Liquid, DOT Packing Group II, OSHA IB |
| F3 | Flammable Liquid, DOT Packing Group III, OSHA IC |
| F4 | Flammable Liquid, DOT Packing Group III, OSHA II |
| F5 | Flammable Liquid and Poison |
| F6 | Flammable Liquid, and Corrosive, Acidic |
| F7 | Flammable Liquid and Corrosive, Alkali |
| F8 | Flammable Solid |
| G1 | Gas, Poison (Nonflammable) |
| G2 | Gas, Flammable |
| G3 | Gas, Nonflammable |
| G4 | Gas, Nonflammable, Oxidizer |
| G5 | Gas, Nonflammable, Corrosive |
| G6 | Gas, Poison, Corrosive (Nonflammable) |
| G7 | Gas, Poison, Oxidizer (Nonflammable) |
| G8 | Gas, Poison, Flammable |
| G9 | Gas, Poison, Corrosive, Oxidizer (Nonflammable) |
| H1 | Hazard Characteristics Not Yet Determined |
| K1 | Infectious Substance |
| K2 | Cytotoxic Drugs |
| M1 | Magnetized Material |
| N1 | Not Regulated as Hazardous |
| P1 | Peroxide, Organic, DOT Regulated |
| P2 | Peroxide, Organic, Low Risk |
| R1 | Reactive Chemical, Flammable |
| R2 | Water Reactive Chemical |
| T1 | DOT Poison-Inhalation Hazard |
| T2 | UN Poison, Packing Group I |
| T3 | UN Poison, Packing Group II |
| T4 | UN Poison, Packing Group III |
| T5 | Pesticide, Low Risk |
| T6 | Health Hazard |
| T7 | Carcinogen (OSHA, NTP, IARC) |
| V1 | Miscellaneous Hazardous Materials - Class 9 |
| V2 | Aerosol, NonFlammable |
| V3 | Aerosol, Flammable |
| V4 | DOT Combustible Liquid, OSHA IIIA |
| V5 | High Flash Point Materials, OSHA IIIB |
| V6 | Petroleum Products |
| V7 | Environmental Hazard |
| X1 | Multiple Hazards Under One NSN |
| Z1 | Article Containing Asbestos |
| Z2 | Article Containing Mercury |
| Z3 | Article Containing Polychlorinated Biphenyl (PCB) |
| Z4 | Article, Battery, Lead Acid, Nonspillable |
| Z5 | Article, Battery, Nickel Cadmium, Nonspillable |
| Z6 | Article, Battery, Lithium |
| Z7 | Article, Battery, Dry Cell |