MAS
Multiple Award Schedule
Default civilian vehicle. You bid a SIN, not a legacy Schedule 70 / 84 number. Orders flow through eBuy and eLibrary.
GSA
Civilian agencies buy through this catalog. We show which category codes match your trade so you know where you can bid.
Each catalog slot is a . If you hold the right one, agencies can buy faster.
MAS
Default civilian vehicle. You bid a SIN, not a legacy Schedule 70 / 84 number. Orders flow through eBuy and eLibrary.
OASIS+
Unrestricted and small-business professional services. Domain-based (management, technical, intelligence, research). Not a SIN catalog.
Alliant 2
Unrestricted GWAC for large IT. Small firms typically team rather than hold the prime seat.
8(a) STARS III
8(a) GWAC for IT. Functional areas replace SINs. Confirm the holder list and sunset before you chase a task.
54151S
Information Technology Professional Services
The workhorse SIN for labor-hour IT. Pair with 54151HACS when the SOW is cyber-specific.
NAICS 541511 Custom Computer Programming Services · 541512 Computer Systems Design Services · 541513 Computer Facilities Management Services · 541519 Other Computer Related Services
54151HACS
Highly Adaptive Cybersecurity Services
Incident response, risk/vulnerability assessment, cyber hunt, and penetration testing. Separate technical evaluation.
NAICS 541512 Computer Systems Design Services · 541519 Other Computer Related Services
518210C
Cloud Computing and Cloud-Related IT Services
IaaS/PaaS/SaaS. FedRAMP authorization is usually in the RFQ, not the SIN itself.
NAICS 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services · 541512 Computer Systems Design Services · 541513 Computer Facilities Management Services
561210
Facilities Maintenance and Management
BOS-style work. HVAC and electrical trades often flow through this SIN plus construction clauses.
NAICS 561210 Facilities Support Services · 238220 Plumbing, Heating, and Air-Conditioning Contractors · 238210 Electrical Contractors and Other Wiring Installation Contractors
OLM
Order-Level Materials
Not a standalone bid vehicle. Materials incidental to a services order, capped by the MAS OLM clause.
NAICS 561210 Facilities Support Services · 238220 Plumbing, Heating, and Air-Conditioning Contractors · 238210 Electrical Contractors and Other Wiring Installation Contractors
7 sample holders overlap your codes — illustrative, not a live GSA eLibrary extract.
Hardware, software, cloud, cyber, and IT professional services under MAS.
Janitorial, grounds, maintenance, HVAC, and facilities support.
Management consulting, engineering, logistics, and training.
Guard services, physical security, and protective equipment.
Tools, hardware, and MRO supplies often used as OLM on services orders.
Lab, medical, and test equipment plus related professional support.
| SIN | Title | NAICS | Your fit |
|---|---|---|---|
| 54151S | Information Technology Professional Services The workhorse SIN for labor-hour IT. Pair with 54151HACS when the SOW is cyber-specific. | 541511, 541512, 541513, 541519 | Mapped |
| 54151HACS | Highly Adaptive Cybersecurity Services Incident response, risk/vulnerability assessment, cyber hunt, and penetration testing. Separate technical evaluation. | 541512, 541519 | Mapped |
| 518210C | Cloud Computing and Cloud-Related IT Services IaaS/PaaS/SaaS. FedRAMP authorization is usually in the RFQ, not the SIN itself. | 518210, 541512, 541513 | Mapped |
| 33411 | Purchasing of New Electronic Equipment TAA-compliant hardware. Often combined with 811212 for maintenance. | 334111, 334220 | — |
| 561720 | Janitorial and Custodial Services SCA wage determinations attach at the order level. Green product clauses are common. | 561720 | — |
| 561210 | Facilities Maintenance and Management BOS-style work. HVAC and electrical trades often flow through this SIN plus construction clauses. | 561210, 238220, 238210 | Mapped |
| 561730 | Grounds Maintenance Mowing, snow, irrigation. Seasonal CLIN structures are typical. | 561730 | — |
| 541330ENG | Engineering Services A-E limitations still apply when the order is a statutory A-E package (Brooks Act). | 541330 | — |
| 541611 | Management and Financial Consulting PMO, acquisition support, and process improvement. Watch personal-services language. | 541611, 541614, 541690 | — |
| 541620 | Environmental Consulting Often paired with remediation SINs when dirt moves. | 541620, 562910 | — |
| 561612 | Protective Service Occupations FPS and civilian guard. Licensing is state-by-state on the order. | 561612 | — |
| 339113 | Medical Equipment and Supplies FDA and TAA dominate evaluation. Distribution SINs may be required for kitting. | 339112, 339113 | — |
| OLM | Order-Level Materials Not a standalone bid vehicle. Materials incidental to a services order, capped by the MAS OLM clause. | 561210, 238220, 238210 | Mapped |
| 541310 | Architectural Services Brooks Act still applies when the order is statutory A-E. Pair with 541330ENG on mixed packages. | 541310, 541320 | — |
| 334290 | Security and Detection Systems PACS, VMS, and intrusion. Often ordered with 238210 installation labor. | 561621, 334220 | — |
| 336413 | Aircraft Parts and Auxiliary Equipment Source-controlled aviation hardware. TAA and FAA/DoD airworthiness language dominate. | 336411, 336412, 336413 | — |
Composite examples of how MAS / STARS III records look in eLibrary — for matching practice, not award decisions.
Northline Cyber Partners LLC
47QTCA24D0128
NAICS 541512, 541519
Expires 2029-04-12
VA, MD, DC, TX
Harbor & Vale Facilities Inc.
47QSHA23D0881
NAICS 561210, 561720, 238220
Expires 2028-11-03
TX, OK, LA
Cinder Peak Mechanical
47QSHA25D0044
NAICS 238220, 238210
Expires 2030-01-19
TX, NM, AZ
Keystone Stack Software
47QTCA22D2109
NAICS 541511, 541512, 518210
Expires 2027-08-30
Nationwide
Red Oak Clinical Supply
36F79724D0188
NAICS 339112, 339113
Expires 2029-06-01
PA, NJ, NY, MD
Quorum Guard Group
47QSHA24D0510
NAICS 561612
Expires 2028-02-14
PA, DE, MD, VA
Lattice Field Engineering
47QRAA23D0117
NAICS 541330, 541620
Expires 2028-09-09
AL, TN, GA, FL
Aster GWAC Solutions
47QTCB22D0031
NAICS 541511, 541512, 541513
Expires 2026-07-02
Nationwide
Plainview Cloud Federal
47QTCA21D0888
NAICS 518210, 541513
Expires 2026-12-15
Nationwide
Mesa Rim Environmental
47QRAA25D0009
NAICS 541620, 562910
Expires 2030-03-22
NJ, NY, PA
Cedar Domain Partners
47QRCA24D0019
NAICS 541611, 541512, 541330
Expires 2034-12-19
Nationwide
Harborline Alliant JV
47QTCK18D0033
NAICS 541512, 541513, 518210
Expires 2028-06-30
Nationwide