335999: All Other Miscellaneous Electrical Equipment and Component Manufacturing

What this code covers

NAICS 335999 is the residual code for electrical equipment and components: static power supplies, AC to DC converters and DC to AC inverters, battery chargers, electric solenoids, surge suppressors, ultrasonic generators and cleaners, fuel cells, and capacitors and rectifiers that are not electronic component types. If the product is a loaded circuit card rather than a finished electrical unit, 334418 is the better fit.

Defense buyers use it for rugged power supplies and converters for aircraft, ships and vehicles, shelter power distribution, battery chargers for vehicle and portable batteries, solenoids for valves and actuators, and shipboard power conditioning. Small firms do well here because many of these units are drawing-controlled boxes that a competent electrical shop can build to print.

What federal buyers typically ask for

Power characteristics are cited by platform standard: MIL-STD-704 for aircraft electrical power, MIL-STD-1275 for military vehicles, and MIL-STD-1399 for shipboard interfaces. Environmental and EMI qualification usually points to MIL-STD-810 and MIL-STD-461. First article testing with a full qualification report is common for a new source on a drawing-controlled unit, and a certificate of conformance ships with every lot.

Because most of these units contain electronic parts, the DFARS counterfeit electronic part clause applies, and the housings and hardware can bring in the specialty metals clause. Units drawn for a named weapon system are often ITAR controlled. Critical application items at DLA and NAVSUP Weapon Systems Support require source approval before award, and the package usually asks for test data.

Spares and replacement units are often small business set-asides, and commercial rugged power products are bought under commercial item procedures. Original equipment for a platform tends to go to the system prime and reach small shops as subcontracts.