PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

T-40Key,socket Head Screw

Barrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc · NSN 5120-01-577-7994 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-577-7994 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-577-7994. Primary manufacturer part number: T-40.
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 5120-01-577-7994, 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. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-577-7994
Primary Part NumberT-40
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 7
5940-00-188-5440821 INTERCHANGEABLE
Terminal Board
Keystone Electronics Corp
4910-00-247-1372T-40 INTERCHANGEABLE
Detector,engine Bearing Oil Leak
Federal-Mogul Corp Government Sales Dept
5320-00-285-10258327759 INTERCHANGEABLE
Rivet,solid
U S Army Tank Automotive Command Amsta-Im-Mm
5120-00-473-76515344527 INTERCHANGEABLE
Wrench Box Special
U S Army Tank Automotive Command Amsta-Im-Mm
3930-00-679-4823 INTERCHANGEABLE
Tractor,wheeled,warehouse
6680-01-360-0851T-40 INTERCHANGEABLE
Meter,flow Rate Indicating
Smith Meter Inc Parts Opn
5120-01-415-4192T40 INTERCHANGEABLE
Screwdriver Attachment,socket Wr
Stanley Industrial & Automotive Llc
Cross-Reference Index
Part NumberManufacturer
T-40 PRIMARY Barrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc (USA)
Related Parts
5940-00-188-5440INTERCHANGEABLE
TERMINAL BOARD
821
4910-00-247-1372INTERCHANGEABLE
DETECTOR,ENGINE BEARING OIL LEAK
T-40
5320-00-285-1025INTERCHANGEABLE
RIVET,SOLID
8327759
5120-00-473-7651INTERCHANGEABLE
WRENCH BOX SPECIAL
5344527
3930-00-679-4823INTERCHANGEABLE
TRACTOR,WHEELED,WAREHOUSE
6680-01-360-0851INTERCHANGEABLE
METER,FLOW RATE INDICATING
T-40
5120-01-415-4192INTERCHANGEABLE
SCREWDRIVER ATTACHMENT,SOCKET WR
T40

Frequently Asked Questions

What is NSN 5120-01-577-7994?

NSN 5120-01-577-7994 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 5120-01-577-7994?

NSN 5120-01-577-7994 has 1 cross-referenced part number: T-40 (Barrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc).

What NSN replaces 5120-01-577-7994?

There are 7 known substitutes for 5120-01-577-7994: 5940-00-188-5440, 4910-00-247-1372, 5320-00-285-1025 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of T-40?

Key specifications for T-40: Overall Length: 6.000 INCHES NOMINAL IN; Special Features: TORX SIZE T-27; GREEN HANDLE; Wrenching Surface Shape: 6 POINT STAR SINGLE END EXTERNAL; 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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