PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

T-39Key,socket Head Screw

Barrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc · NSN 5120-01-577-7990 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-577-7990 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-577-7990. Primary manufacturer part number: T-39.
Features
  • Key,socket Head Screw — FSC 5120
  • Wrenching Surface Shape: 6 POINT STAR SINGLE END EXTERNAL
  • Style Designator: FIXED T-HANDLE
  • 1 verified cross-reference
  • Primary manufacturer: Barrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Key,socket Head Screw, cataloged under National Stock Number 5120-01-577-7990, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Barrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-577-7990
Primary Part NumberT-39
Item NameKey,socket Head Screw
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerBarrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc
StatusACTIVE
Wrenching Surface Shape6 POINT STAR SINGLE END EXTERNAL
Style DesignatorFIXED T-HANDLE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
3110-00-144-8488110381-3 INTERCHANGEABLE
Bearing,ball,annular
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
3920-00-433-1121 INTERCHANGEABLE
Roller
3460-00-473-77645344524 INTERCHANGEABLE
Socket,straight Shank Tool
U S Army Tank Automotive Command Amsta-Im-Mm
3040-00-752-1156T39 INTERCHANGEABLE
Pawl
Nash Bros Construction Co Inc
5975-00-931-7902 INTERCHANGEABLE
Conduit Outlet
5340-01-053-2586T-39 INTERCHANGEABLE
Bumper
Lavelle Industries, Inc. Dba Lavelle
Cross-Reference Index
Part NumberManufacturer
T-39 PRIMARY Barrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc (USA)
Related Parts
3110-00-144-8488INTERCHANGEABLE
BEARING,BALL,ANNULAR
110381-3
3920-00-433-1121INTERCHANGEABLE
ROLLER
3460-00-473-7764INTERCHANGEABLE
SOCKET,STRAIGHT SHANK TOOL
5344524
3040-00-752-1156INTERCHANGEABLE
PAWL
T39
5975-00-931-7902INTERCHANGEABLE
CONDUIT OUTLET
5340-01-053-2586INTERCHANGEABLE
BUMPER
T-39

Frequently Asked Questions

What is NSN 5120-01-577-7990?

NSN 5120-01-577-7990 is a Key,socket Head Screw, manufactured by Barrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-577-7990?

NSN 5120-01-577-7990 has 1 cross-referenced part number: T-39 (Barrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc).

What NSN replaces 5120-01-577-7990?

There are 6 known substitutes for 5120-01-577-7990: 3110-00-144-8488, 3920-00-433-1121, 3460-00-473-7764 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of T-39?

Key specifications for T-39: Overall Length: 6.000 INCHES NOMINAL IN; Wrenching Surface Shape: 6 POINT STAR SINGLE END EXTERNAL; Special Features: TORX SIZE T-25; GREEN HANDLE; Style Designator: FIXED T-HANDLE. 4 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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