By Outrider Editorial Team · Updated August 20, 2026
Official definition
This U.S. industry comprises establishments primarily engaged in manufacturing power, distribution, and specialty transformers (except electronic components). Industrial-type and consumer-type transformers in this industry vary (e.g., step up or step down) voltage but do not convert alternating to direct or direct to alternating current.
NAICS 335311 obligated $311 million in FY2025 across 4,379 contract actions. DoD is $294 million, or 95 percent, driven by installation electrical infrastructure and energy resilience projects. DOT at $6 million, DOE at $5 million, State at $2 million, and Interior at $2 million make up the rest. The average action is around $71,000, which reflects a mix of individual unit replacements and larger substation-scale buys.
What belongs here
Power, distribution, and specialty transformers other than electronic components. These change voltage without converting between alternating and direct current, which is the line that separates them from power supplies and converters.
- Other miscellaneous electrical equipment, including power supplies and converters, is 335999.
- Installing the transformer as part of a building or site electrical scope is 238210.
- Mechanical drive components in the same equipment rooms are 333613.
Competing in this code
194 IDVs against 4,379 actions means most awards compete individually. The market condition that shapes every one of them is lead time. Distribution and power transformer delivery schedules have stretched dramatically across the industry, and federal solicitations increasingly evaluate delivery date as a discriminator rather than a formality. A domestic manufacturer with available production slots and documented Buy American compliant material sourcing is competing on the one factor buyers currently care about most, and the 800-employee size standard keeps that manufacturer inside the small business lane.
Frequently Asked
NAICS 335311 questions, answered.
What is the SBA size standard for NAICS 335311?
SBA sets it at 800 employees, counted as a 24-month average headcount across your company and every affiliate, not revenue. At or under that number you are small on NAICS 335311 solicitations and eligible for the set-asides in this code.
Which agencies buy transformers under NAICS 335311?
FY2025 obligations: DoD ($294 million), DOT ($6 million), DOE ($5 million), State ($2 million), Interior ($2 million). DoD at 95 percent reflects installation electrical infrastructure recapitalization and energy resilience projects across the services.
Why does delivery schedule matter so much in NAICS 335311?
Because transformer lead times across the industry have stretched to the point where they gate project completion. Federal solicitations now treat delivery date as a real discriminator and no longer as an administrative field, which advantages domestic manufacturers with available production slots over lower-priced offers with distant delivery.
What is the boundary between NAICS 335311 and 335999?
Function. 335311 covers transformers that step voltage up or down without converting between alternating and direct current. Power supplies, converters, and rectifiers that do convert fall into 335999. The definition is explicit about this, and it decides which code a solicitation uses.
Register Under NAICS 335311
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