Includes
Compressor and Turbine Rotors; Blades; Combustion Chamber; Accessory Gear Box; Afterburner; Exhaust Cone; Reservoirs, Hydraulic; Tank, Oil.

Excludes
Oil, Air, Anti-icing, and Hydraulic Regulators, Valves, and Pumps specially designed for Gas Turbines and Jet Engines (FSC 2995); Control Assemblies, Push-Pull (FSC 2995); Engine Mounted Control Assemblies (FSC 2995); Fuel System Components (FSC 2915); Engine Electrical System Components (FSC 2925); Engine Cooling System Components (FSC 2935); Engine Air/Oil Cleaner/Filter/Strainers (FSC 2945).

Notes
Engines and Components classified in this FSC are intended for use as/on aircraft and/or guided missile prime movers.

Possible NAICS Codes
336412 – Aircraft Engine and Engine Parts Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
336411 – Aircraft Manufacturing
314999 – All Other Miscellaneous Textile Product Mills
332510 – Hardware Manufacturing
332722 – Bolt, Nut, Screw, Rivet, and Washer Manufacturing
488190 – Other Support Activities for Air Transportation
333611 – Turbine and Turbine Generator Set Units Manufacturing
332996 – Fabricated Pipe and Pipe Fitting Manufacturing

Includes
Carburetors; Fuel Pumps; Engine Fuel Filters; Fuel Controls, Jet Engine; Fuel Primers; Water Injection Controls and Valves; Fuel Valves; Fuel Flow Regulators; Components of Smoke Abatement Systems.

Excludes
Aircraft Fuel Tanks (FSC 1560); In-flight Refueling System Fuel Components (FSC 1680). Fuel System Components not specifically designed for use with Aircraft Engines or Missile Prime movers.

Notes
Fuel components specially designed for propulsion fuel systems, aircraft and missiles are to be placed in this FSC.

Possible NAICS Codes
336412 – Aircraft Engine and Engine Parts Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
334419 – Other Electronic Component Manufacturing
332991 – Ball and Roller Bearing Manufacturing
332722 – Bolt, Nut, Screw, Rivet, and Washer Manufacturing
333611 – Turbine and Turbine Generator Set Units Manufacturing
333998 – All Other Miscellaneous General Purpose Machinery Manufacturing
339950 – Sign Manufacturing
336411 – Aircraft Manufacturing

Includes
Engine Dynafocal Suspension Mounts; Engine Cowling Mounts; Engine Mounted Control Assemblies; Pneumatic Starters; Push-Pull Control Assemblies; Specially designed Jet Engine Air, Oil, Anti-icing and Hydraulic Regulators; Valves and Pumps; Starting Units.

Excludes
Exhaust System; (FSC 1560); Jet Engine Hydraulic Reservoirs (FSC 2840); Jet Engine Oil Tanks (FSC 2840); Electrical Starters (FSC 2925); Cockpit Mounted Control Quadrants (FSC 1680); Aircraft Engine Covers (FSC 1730).

Notes
Items classified in this class must be specifically designed for use with aircraft or guided missile prime-movers only.

Possible NAICS Codes
336412 – Aircraft Engine and Engine Parts Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
336411 – Aircraft Manufacturing
332510 – Hardware Manufacturing
333612 – Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing
488190 – Other Support Activities for Air Transportation
332722 – Bolt, Nut, Screw, Rivet, and Washer Manufacturing

Possible NAICS Codes
332722 – Bolt, Nut, Screw, Rivet, and Washer Manufacturing
322299 – All Other Converted Paper Product Manufacturing
332510 – Hardware Manufacturing
332112 – Nonferrous Forging
333618 – Other Engine Equipment Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
332994 – Small Arms, Ordnance, and Ordnance Accessories Manufacturing
336412 – Aircraft Engine and Engine Parts Manufacturing
423710 – Hardware Merchant Wholesalers
332912 – Fluid Power Valve and Hose Fitting Manufacturing

Includes
Magnetos; Igniters (Spark Plugs); Ignition Coils; Ignition Distributors; Engine Voltage Regulators; Ignition Harness Assemblies; Starting Motors for Engines; Engine Accessory Generators.

Excludes
Aircraft Lighting Fixtures (FSC 6220); and Auxiliary Aircraft Generators (FSC 6115).

Notes
Items designed for specific use on aircraft and guided missile prime movers are to be placed in this FSC.

Possible NAICS Codes
336412 – Aircraft Engine and Engine Parts Manufacturing
339950 – Sign Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
336320 – Motor Vehicle Electrical and Electronic Equipment Manufacturing
336411 – Aircraft Manufacturing
488190 – Other Support Activities for Air Transportation
334419 – Other Electronic Component Manufacturing
332722 – Bolt, Nut, Screw, Rivet, and Washer Manufacturing

Includes
Control Assemblies, Push-Pull; Brace, Positioning Cargo Ramp Stowed on Board; Cockpit Mounted Control Quadrants; Actuators, Electromechanical and Mechanical; Ventilators; Relief Tubes; Map Holders; Aerial Glider Towing Accessories Attached to Aircraft; Belts, Safety and Lap; Harness, Shoulder and Safety; Litter Attaching Supports; Electric Windshield Wipers; Aircraft Onboard Inert Gas Generators; Aircraft Furniture; Aircraft Mounted Winches and Hoists; In-Flight Refueling System Components, including Fuel Components; Aircraft Curtains; Cable Tension Regulators; Sun Visors; Rear-View Mirrors; Mechanical Transmissions, Gearboxes and Constant Speed Drives Specially Designed for Aircraft.

Excludes
Engine Mounted Control Assemblies; Fitted Covers, Aircraft Pylons; Helicopter Rotor Brake System Components; Helicopter Automatic Stabilization Equipment.

Possible NAICS Codes
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
336411 – Aircraft Manufacturing
336412 – Aircraft Engine and Engine Parts Manufacturing
488190 – Other Support Activities for Air Transportation
334511 – Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing

Includes
Flight Control Surfaces, internal and external Auxiliary Fuel Tanks; Exhaust Systems, Pylons, Trim Tabs; Aircraft.

Excludes
Fitted Covers; Helicopter Rotor Brake System and Components; Aircraft Loose Equipment and Alternate Mission Configuration Equipment stored on board the Aircraft.

Notes
This class includes fabricated system parts that are permanently attached or peculiar to the integral airframe of an aircraft, such as support structural components, spars, ribs, ailerons, stabilizers, bulkheads.

Possible NAICS Codes
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
336411 – Aircraft Manufacturing
488190 – Other Support Activities for Air Transportation

Includes
Air Filters; Oil Filters; Strainers; Cleaners.

Excludes
Fuel Filters (FSC 2915); Items designed for other than Engines.

Notes
Items placed in this FSC should be specifically designed for use on aircraft or guided missile prime movers only.

Possible NAICS Codes
336412 – Aircraft Engine and Engine Parts Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
336411 – Aircraft Manufacturing
336390 – Other Motor Vehicle Parts Manufacturing
314999 – All Other Miscellaneous Textile Product Mills
333611 – Turbine and Turbine Generator Set Units Manufacturing
332991 – Ball and Roller Bearing Manufacturing
488190 – Other Support Activities for Air Transportation

Description
Maintenance, Repair and Rebuilding of Equipment: Engines, Turbines, and Components

Possible NAICS Codes
336412 – Aircraft Engine and Engine Parts Manufacturing
811310 – Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance
333618 – Other Engine Equipment Manufacturing
811111 – General Automotive Repair
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
336350 – Motor Vehicle Transmission and Power Train Parts Manufacturing
488190 – Other Support Activities for Air Transportation
333611 – Turbine and Turbine Generator Set Units Manufacturing
336611 – Ship Building and Repairing
811490 – Other Personal and Household Goods Repair and Maintenance

Includes
General Purpose Oil Grease, Air, Liquid, Gas, and chemical Seals; Oakum; Prefabricated Gaskets and Seals designed for a single specific application.

Excludes
O-Rings (FSC 5331); Bulk material items, such as; Rubber, Cork, and Asbestos Sheets and Strips (FSG 93); Liquid Gasket Materials (RTV), Permatex, etc.) (FSG 80); RFI and EMI Seals and Gaskets (FSC 5999), and all Seal Retainers.

Notes
This FSC includes only seals and gaskets designed for standard use. Seals, gaskets and packing are made from materials specifically designed and constructed to resist deterioration from the action of heat, gas, chemicals, liquids, and used to fill a cavity and create a tight seal. Similar materials used to make seals, gaskets and packing are available in bulk form, refer to FSG 93, FSG 80, and FSG 83.

Possible NAICS Codes
339991 – Gasket, Packing, and Sealing Device Manufacturing
332722 – Bolt, Nut, Screw, Rivet, and Washer Manufacturing
333618 – Other Engine Equipment Manufacturing
336411 – Aircraft Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
332994 – Small Arms, Ordnance, and Ordnance Accessories Manufacturing
339950 – Sign Manufacturing
333998 – All Other Miscellaneous General Purpose Machinery Manufacturing
333120 – Construction Machinery Manufacturing
326220 – Rubber and Plastics Hoses and Belting Manufacturing

Description
Hardware

Includes
Access Covers; Bumpers; Casters; Cabinet and Door Hardware; Clevises; Hinges; Latches; Straps and Strapping; Turnbuckles; Webbed Straps.

Excludes
Weapons System Hardware (5342).

Notes
Common hardware designed primarily for commercial use will be classified in this FSC. Hardware is the physical, tangible, and permanent components of end items that may not be classified elsewhere. It consists also of common items that are commonly used in construction and/or manufacturing (e.g., hinges, door locks).

Possible NAICS Codes
332510 – Hardware Manufacturing
332722 – Bolt, Nut, Screw, Rivet, and Washer Manufacturing
444110 – Home Centers
423710 – Hardware Merchant Wholesalers
333618 – Other Engine Equipment Manufacturing
339999 – All Other Miscellaneous Manufacturing
332999 – All Other Miscellaneous Fabricated Metal Product Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
336411 – Aircraft Manufacturing
333120 – Construction Machinery Manufacturing

Includes
Shafts and Shafting; Collars; Gearshafts; Ball Joints; Actuating Cylinders.

Possible NAICS Codes
333613 – Mechanical Power Transmission Equipment Manufacturing
336411 – Aircraft Manufacturing
333618 – Other Engine Equipment Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
332510 – Hardware Manufacturing
336350 – Motor Vehicle Transmission and Power Train Parts Manufacturing
332722 – Bolt, Nut, Screw, Rivet, and Washer Manufacturing
332994 – Small Arms, Ordnance, and Ordnance Accessories Manufacturing
336412 – Aircraft Engine and Engine Parts Manufacturing
333612 – Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing

Includes
Appliance and Extension Cords; Electric Power and Distribution Cable with Attachments, Multiapplication; Common Components of Electrical Rotating Equipment, such as End Bells and Frames.

Possible NAICS Codes
334419 – Other Electronic Component Manufacturing
335311 – Power, Distribution, and Specialty Transformer Manufacturing
335139 – Electric Lamp Bulb and Other Lighting Equipment Manufacturing
333618 – Other Engine Equipment Manufacturing
335999 – All Other Miscellaneous Electrical Equipment and Component Manufacturing
332510 – Hardware Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
332722 – Bolt, Nut, Screw, Rivet, and Washer Manufacturing
336411 – Aircraft Manufacturing
332994 – Small Arms, Ordnance, and Ordnance Accessories Manufacturing

Description
Bushings, Rings, Shims and Spacers

Includes
Externally Threaded Rings; Keyed and Serrated Lock Rings; Dee Rings; Instrument Retaining Rings; Shim Sets and Assortments; Plate Spacers; Ring Spacers; Sleeve Spacers; Stepped Spacers; Spacer Sets and Assortments; Sleeve Bushings; Machine Threaded Bushings; Machine Threaded Plugs.

Excludes
Sleeve Bearings (FSC 3120); Pipe Threaded Plugs (FSC 4730); Piston Rings (FSC 2520, 2805, 2810, 2815, 2825, 2990, 3040, 4310 and 4820); Retaining Rings (FSC 5325); Shim Stock (FSC 9515).

Notes
All items, including specially designed, will be classified in this FSC. a. A bushing is cylindrical in shape, hollow, and designed primarily to be inserted into a hole to reduce the effective inside diameter of the hole, and to protect the body structure about the hole, and to protect the body structure about the hole from damage resulting from stress, strain, and vibration. b. A ring is cylindrical in shape, usually flat with a center hole. Rings are multi-applicational. See specific item name for designated usage. c. A shim is a thin, sometimes tapered, piece of material used to fill in space between things. See specific item name for dimensional parameters. d. A spacer is a device for holding two members at a given distance from each other.

Possible NAICS Codes
332510 – Hardware Manufacturing
332722 – Bolt, Nut, Screw, Rivet, and Washer Manufacturing
332119 – Metal Crown, Closure, and Other Metal Stamping (except Automotive)
336411 – Aircraft Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
332999 – All Other Miscellaneous Fabricated Metal Product Manufacturing
333618 – Other Engine Equipment Manufacturing
332994 – Small Arms, Ordnance, and Ordnance Accessories Manufacturing
332439 – Other Metal Container Manufacturing
333998 – All Other Miscellaneous General Purpose Machinery Manufacturing

Includes
Helicopter dynamic components and specially designed parts that transmit power from the aircraft power plant to the rotary wing and rotary rudder. Also included in this class are Rotors; Blades; Rotor Blade, Trim, Tabs; Blade Sets; Yokes; Clutches and Transmissions.

Excludes
Propellers (FSC 1610); Rotor Brake Systems Components (FSC 1630); Rotor Blade Hydraulic Folding System Components (FSC 1650); Hydraulic Servo System Components (FSC 1650).

Notes
This class includes miscellaneous component parts specifically designed for, and used exclusively in, helicopter drive mechanisms and rotor blades when not specifically classified elsewhere in the FSC indexes.

Possible NAICS Codes
336411 – Aircraft Manufacturing
336413 – Other Aircraft Parts and Auxiliary Equipment Manufacturing
336412 – Aircraft Engine and Engine Parts Manufacturing
333998 – All Other Miscellaneous General Purpose Machinery Manufacturing