PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FFB561ANDTYPE1ANDGRADECScrew,lag

Federal Specifications Promulgated by General Services Administration Washington DC · NSN 5305-00-282-8991 · FSC 5305 · No Item Name Available
Verified by PartsTable
NSN 5305-00-282-8991 — this item is cataloged by the U.S. Government under National Stock Number 5305-00-282-8991. Primary manufacturer part number: FFB561ANDTYPE1ANDGRADEC.
Features
  • Screw,lag — FSC 5305
  • Fastener Length: 2.000 INCHES NOMINAL IN
  • Head Height: 0.250 INCHES NOMINAL IN
  • Head Style: SQUARE
  • Material: STEEL OVERALL
  • Width Between Flats: 0.562 INCHES NOMINAL IN
  • Nonmachine Thread Style: FETTER DRIVE (TYPE DR)
  • 2 verified cross-references
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Screw,lag, cataloged under National Stock Number 5305-00-282-8991, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Federal Specifications Promulgated by General Services Administration Washington DC. Government technical data includes 6 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5305-00-282-8991
Primary Part NumberFFB561ANDTYPE1ANDGRADEC
Item NameScrew,lag
FSC / FSG5305 / 53 — No Item Name Available
ManufacturerFederal Specifications Promulgated by General Services Administration Washington DC
StatusACTIVE
Fastener Length2.000 INCHES NOMINAL IN
Head Height0.250 INCHES NOMINAL IN
Head StyleSQUARE
MaterialSTEEL OVERALL
Width Between Flats0.562 INCHES NOMINAL IN
Nonmachine Thread StyleFETTER DRIVE (TYPE DR)
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
6680-01-106-308054064 INTERCHANGEABLE
Transmitter,liquid Quantity
Setra Systems, Inc. Dba Gems Sensors
5940-01-160-1733SS20829B INTERCHANGEABLE
Terminal,lug
Electro-Term, Inc. Dba Electro Term Inc
5120-01-534-145154064 INTERCHANGEABLE
Screwdriver,flat Tip
Aerovironment, Inc. Dba Aerovironment Inc
5342-01-642-106954064 INTERCHANGEABLE
Fairlead Section,block
Tulsa Winch, Inc.
Cross-Reference Index
Part NumberManufacturer
FFB561ANDTYPE1ANDGRADEC Federal Specifications Promulgated by General Services Administration Washington DC (USA)
540-6-4 Department of the Air Force (USA)
Related Parts
6680-01-106-3080INTERCHANGEABLE
TRANSMITTER,LIQUID QUANTITY
54064
5940-01-160-1733INTERCHANGEABLE
TERMINAL,LUG
SS20829B
5120-01-534-1451INTERCHANGEABLE
SCREWDRIVER,FLAT TIP
54064
5342-01-642-1069INTERCHANGEABLE
FAIRLEAD SECTION,BLOCK
54064

Frequently Asked Questions

What is NSN 5305-00-282-8991?

NSN 5305-00-282-8991 is a Screw,lag, manufactured by Federal Specifications Promulgated by General Services Administration Washington DC, classified under FSC 5305 (No Item Name Available). Status: active.

What are the part numbers for NSN 5305-00-282-8991?

NSN 5305-00-282-8991 has 2 cross-referenced part numbers: FFB561ANDTYPE1ANDGRADEC (Federal Specifications Promulgated by General Services Administration Washington DC), 540-6-4 (Department of the Air Force).

What NSN replaces 5305-00-282-8991?

There are 4 known substitutes for 5305-00-282-8991: 6680-01-106-3080, 5940-01-160-1733, 5120-01-534-1451 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of FFB561ANDTYPE1ANDGRADEC?

Key specifications for FFB561ANDTYPE1ANDGRADEC: Fastener Length: 2.000 INCHES NOMINAL IN; Head Height: 0.250 INCHES NOMINAL IN; Head Style: SQUARE; Material: STEEL OVERALL. 6 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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