By Outrider Editorial Team · Updated August 20, 2026
PSC R425 covers professional engineering and technical support services: the systems engineering and technical assistance (SETA) work, program-office support, and technical advisory services that sit beside nearly every large federal acquisition program. At $33.2 billion in FY2025 obligations, it is one of the biggest single service codes in federal contracting.
PSC vs NAICS: why you need both
Agencies classify what they are buying with a PSC and classify the vendor's industry with a NAICS code. Every solicitation carries one of each, and vendors who only track NAICS codes miss opportunities filed under service codes they never watch. R425 is the canonical example: the same R425 requirement can be solicited under engineering services, R&D, or management consulting NAICS codes depending on the program office.
Where R425 dollars actually land
FY2025 awards coded R425 flowed mostly to vendors registered under NAICS 541330 Engineering Services at $15.1 billion, followed by R&D code 541715 ($4.7B), its legacy twin 541712 ($2.3B), 541990 ($1.9B), and management consulting 541611. If your registration covers 541330 and you sell technical support, R425 is the PSC to build your opportunity searches around.
NAICS crosswalk
Where FY2025 R425 dollars landed, by the winning vendor's registered NAICS code.
- 541330Engineering Services$15.1B
- 541712Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)$2.3B
FY2025 federal contract obligations, USAspending.gov
Frequently Asked
PSC R425 questions, answered.
What does PSC R425 cover?
Professional engineering and technical support services: SETA support, program-office technical assistance, engineering analysis, and technical advisory work that supports government programs without being the hardware or R&D contract itself.
What NAICS code should I register under to win R425 work?
In FY2025, $15.1B of R425 obligations went to vendors under NAICS 541330 (Engineering Services), with 541715 (R&D) second. Register under the code that matches what your company actually does; 541330 is the most common pairing on real R425 awards.
How is a PSC different from a NAICS code?
The PSC describes what the government is buying on an award; the NAICS code describes the industry of the vendor. Every federal contract action carries both. You pick your NAICS codes when you register in SAM.gov; contracting officers assign the PSC per award.
Watch R425 opportunities
Solicitations are filed by PSC as well as NAICS. Outrider matches your company profile against both so nothing filed under a code you do not watch slips past.
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