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MAS SINs Data Dictionary

This document describes the fields available in the MAS SINs API endpoints (/api/mas_sins/). For filtering, ordering, and pagination, see the MAS SINs API Reference.

Overview

MAS SINs (Special Item Numbers) are GSA schedule line items used to categorize offerings under the MAS schedule. Tango stores SINs as reference data so other datasets (e.g. GSA eLibrary enrichment) can store only SIN codes and join to this table for details.

Note: This endpoint supports response shaping via the shape query parameter. Default shape includes all 15 fields.

Update Frequency

This data is updated by re-running the loader command against the repo-tracked CSV:

  • Management command: load_mas_sins
  • Source file: src/api/data/mas_sins.csv

Fields

Field Type Description Source
sin String Special Item Number code. Primary key. GSA MAS SIN export
large_category_code String (1 char) Large category code (e.g., A). GSA MAS SIN export
large_category_name String Large category name (e.g., Office Management). GSA MAS SIN export
sub_category_code String Subcategory code (e.g., A01). GSA MAS SIN export
sub_category_name String Subcategory name (e.g., Audio Visual Products). GSA MAS SIN export
psc_code String | null PSC code from source (4 chars, may be alphanumeric). GSA MAS SIN export
state_local Boolean Whether SIN is eligible for state/local/cooperative purchasing. GSA MAS SIN export
set_aside_code String (1 char) | null One of Y, N, B. GSA MAS SIN export
service_comm_code String (1 char) | null One of B, C, S, P. GSA MAS SIN export
expiration_date Date | null Parsed from a 7-digit YYYYDDD numeric format when present. GSA MAS SIN export
tdr Boolean TDR flag (Y/N in source). GSA MAS SIN export
olm Boolean OLM flag (Y/N in source). GSA MAS SIN export
naics_codes List[Integer] NAICS codes associated with the SIN. GSA MAS SIN export
title String SIN title (normalized to remove leading SIN code prefix). GSA MAS SIN export
description String | null SIN description (normalized to remove leading SIN code prefix). GSA MAS SIN export

Category codes and names

The MAS SIN dataset includes a small, stable hierarchy:

  • Large category: large_category_code + large_category_name
  • Subcategory: sub_category_code + sub_category_name

For convenience, here is the full mapping present in src/api/data/mas_sins.csv.

Large categories

Code Name
A Office Management
B Facilities
C Furniture and Furnishings
D Human Capital
E Professional Services
F Information Technology
G Miscellaneous
H Scientific Management and Solutions
I Industrial Products and Services
J Security and Protection
K Transportation and Logistics Services
L Travel

Subcategories

Large category code Subcategory code Subcategory name
A A01 Audio Visual Products
A A02 Audio Visual Services
A A03 Document Services
A A04 Mail Management
A A05 Office Management Maintenance and Repair
A A06 Media Products
A A07 Media Services
A A08 Office Services
A A09 Office Supplies
A A10 Printing and Photographic Equipment
A A11 Records Management
B B01 Facilities Maintenance and Repair
B B02 Facilities Services
B B03 Facilities Solutions
B B04 Facilities Supplies
B B05 Food Service Equipment
B B06 Structures
C C01 Flooring
C C02 Furniture Services
C C03 Healthcare Furniture
C C04 Household Dormitory and Quarters Furniture
C C05 Miscellaneous Furniture
C C06 Office Furniture
C C07 Packaged Furniture
C C08 Signs
D D01 Background Investigations
D D02 Compensation and Benefits
D D03 Human Resources
D D04 Social Services
E E01 Business Administrative Services
E E02 Environmental Services
E E03 Financial Services
E E04 Identity Protection Services
E E05 Language Services
E E06 Legal Services
E E07 Logistical Services
E E08 Marketing and Public Relations
E E09 Technical and Engineering Services (non- IT)
E E10 Training
F F01 Electronic Commerce
F F02 IT Hardware
F F03 IT Services
F F04 IT Software
F F05 IT Solutions
F F06 IT Training
F F07 Telecommunications
G G01 Apparel
G G02 Awards
G G03 Flags
G G04 Musical Instruments
G G05 Personal Hair Care Items
G G06 Complementary SINs
H H01 Laboratory Animals
H H02 Laboratory Equipment
H H03 Medical Equipment
H H04 Scientific Services
H H05 Search and Navigation
H H06 Testing and Analysis
I I01 Cleaning Supplies
I I02 Fire/Rescue/Safety/Environmental Protection Equipment
I I03 Fuel Management
I I04 Hardware and Tools
I I05 Industrial Products
I I06 Industrial Products and Services Maintenance and Repair
I I07 Machinery and Components
I I08 Packaging
I I09 Test and Measurement Supplies
J J01 Marine and Harbor
J J02 Protective Equipment
J J03 Security Animals and Related Services
J J04 Security Services
J J05 Security Systems
J J06 Testing Equipment
K K01 Automotive Body Maintenance and Repair
K K02 Motor Vehicles (non-Combat)
K K03 Package Delivery
K K04 Packaging Services
K K05 Transportation of Things
L L01 Employee Relocation
L L02 Lodging
L L03 Travel Agent and Misc. Services

Data sources

  • GSA eLibrary reference export (yoni/MAS_Schedule-SIN.csv), normalized into src/api/data/mas_sins.csv.
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