- 3399 - Primary Metal Products (2 Companies)
- 3421 - Cutlery (10 Companies)
- 3423 - Hand & Edge Tools (14 Companies)
- 3429 - Hardware, Nec (10 Companies)
- 3432 - Plumbing Fixture Fittings & Trim (60 Companies)
- 3433 - Heating Equipment, Except Electric (12 Companies)
- 3441 - Fabricated Structural Metal (49 Companies)
- 3442 - Metal Doors, Sash & Trim (1 Company)
- 3443 - Fabricated Plate Work (Boiler Shops) (48 Companies)
- 3444 - Sheet Metalwork (206 Companies)
- 3446 - Architectural Metalwork (47 Companies)
- 3448 - Prefabricated Metal Buildings & Components (13 Companies)
- 3449 - Misc Structural Metalwork (2 Companies)
- 3469 - Metal Stampings (10 Companies)
- 3471 - Plating And Polishing (79 Companies)
- 3479 - Metal Coating & Allied Services (136 Companies)
- 3484 - Small Arms (1 Company)
- 3491 - Industrial Valves (37 Companies)
- 3494 - Valve & Pipe Fittings, Nec (8 Companies)
- 3495 - Wire Springs (6 Companies)
- 3496 - Miscellaneous Fabricated Wire Products (15 Companies)
- 3498 - Fabricated Pipe & Fittings (32 Companies)
- 3499 - Fabricated Metal Products (37 Companies)
- 3511 - Turbines And Turbine Generator Sets (3 Companies)
- 3519 - Internal Combustion Engines (32 Companies)
- 3523 - Farm Machinery And Equipment (5 Companies)
- 3524 - Lawn And Garden Equipment (2 Companies)
- 3531 - Construction Machinery (3 Companies)
- 3533 - Oil And Gas Field Machinery And Equipment (1 Company)
- 3534 - Elevator And Moving Stairways (1 Company)
- 3536 - Hoists, Cranes, And Monorails (1 Company)
- 3541 - Machine Tools, Metal Cutting Type (2 Companies)
- 3542 - Machine Tools, Metal Forming Type (2 Companies)
- 3543 - Industrial Patterns (1 Company)
- 3544 - Special Dies, Tools, Jigs, And Fixtures (26 Companies)
- 3545 - Machine Tool Accessories (16 Companies)
- 3546 - Power Driven Handtools (2 Companies)
- 3552 - Textile Machinery (1 Company)
- 3553 - Woodworking Machinery (1 Company)
- 3556 - Food Products Machinery (12 Companies)
- 3559 - Special Industry Machinery (16 Companies)
- 3561 - Pumps And Pumping Equipment (6 Companies)
- 3564 - Blowers, Fans, And Air Purification Equipment (1 Company)
- 3565 - Packaging Machinery (2 Companies)
- 3567 - Ndustrial Furnaces And Ovens (18 Companies)
- 3569 - General Industrial Machinery (51 Companies)
- 3571 - Electronic Computers (28 Companies)
- 3578 - Calculating And Accounting Equipment (167 Companies)
- 3582 - Commercial Laundry, Drycleaning, And Pressing Equi (11 Companies)
- 3585 - Refrigeration And Heating Equipment (19 Companies)
