PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

BS4Key,socket Head Screw

Bondhus Corp · NSN 5120-01-240-0666 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-240-0666 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-240-0666. Primary manufacturer part number: BS4.
Features
  • Key,socket Head Screw — FSC 5120
  • Blade Length: 97.0 MILLIMETERS NOMINAL MM
  • Material: STEEL WRENCHING SURFACE
  • Features Provided: BALL END
  • Wrenching Surface Shape: HEXAGON SINGLE END EXTERNAL
  • Wrenching Surface Size: 4.0 MILLIMETERS NOMINAL SINGLE END MM
  • Surface Treatment: OXIDE WRENCHING SURFACE
  • Material: PLASTIC HANDLE
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Wrenching Surface construction
General Description

The Key,socket Head Screw, cataloged under National Stock Number 5120-01-240-0666, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Bondhus Corp. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-01-240-0666
Primary Part NumberBS4
Item NameKey,socket Head Screw
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerBondhus Corp
StatusACTIVE
Blade Length97.0 MILLIMETERS NOMINAL MM
MaterialSTEEL WRENCHING SURFACE
Features ProvidedBALL END
Wrenching Surface ShapeHEXAGON SINGLE END EXTERNAL
Wrenching Surface Size4.0 MILLIMETERS NOMINAL SINGLE END MM
Surface TreatmentOXIDE WRENCHING SURFACE
MaterialPLASTIC HANDLE
Style DesignatorSCREWDRIVER HANDLE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5315-00-188-9486BS1022PC10 INTERCHANGEABLE
Key,machine
Circor Naval Solutions Llc Dba Warren Pumps
4320-00-218-38203622P INTERCHANGEABLE
Cover,hydraulic,pump-Motor
Curtiss-Wright Electro-Mechanical Corporation Div Epd
5950-00-401-734810660 INTERCHANGEABLE
Transformer,power
Magnetika Inc
5965-00-402-520810660 INTERCHANGEABLE
Headset-Microphone
Astrocom Electronics Inc
5950-00-733-916010660 INTERCHANGEABLE
Reactor
Continental Electronics Corp
6105-00-800-8416BS4 INTERCHANGEABLE
Motor,direct Current
Aerocontrolex Group, Inc. Div Talley Actuators
5930-00-908-760677C706668P001 INTERCHANGEABLE
Switch,rotary
Lockheed Martin Corporation Div Rms
5910-01-093-9040CS485 INTERCHANGEABLE
Capacitor,fixed,plastic Dielectr
High Energy Corp.
6505-01-112-188610660 INTERCHANGEABLE
Aspirin Tablets
Goldline Laboratories, Inc. Dba Goldline Laboratories
5330-01-159-5000 INTERCHANGEABLE
Gasket,belljar
Cross-Reference Index
Part NumberManufacturer
0257 1317 Blackwood J. Blackwood & Son Pty Ltd (AUS)
BS4 PRIMARY Bondhus Corp (USA)
10660 PRIMARY Bondhus Corp (USA)
Related Parts
5315-00-188-9486INTERCHANGEABLE
KEY,MACHINE
BS1022PC10
4320-00-218-3820INTERCHANGEABLE
COVER,HYDRAULIC,PUMP-MOTOR
3622P
5950-00-401-7348INTERCHANGEABLE
TRANSFORMER,POWER
10660
5965-00-402-5208INTERCHANGEABLE
HEADSET-MICROPHONE
10660
5950-00-733-9160INTERCHANGEABLE
REACTOR
10660
6105-00-800-8416INTERCHANGEABLE
MOTOR,DIRECT CURRENT
BS4
5930-00-908-7606INTERCHANGEABLE
SWITCH,ROTARY
77C706668P001
5910-01-093-9040INTERCHANGEABLE
CAPACITOR,FIXED,PLASTIC DIELECTR
CS485
6505-01-112-1886INTERCHANGEABLE
ASPIRIN TABLETS
10660
5330-01-159-5000INTERCHANGEABLE
GASKET,BELLJAR
8455-01-317-9831INTERCHANGEABLE
STRAP,NECK
BS-4
3020-01-413-7517INTERCHANGEABLE
GUARD,MECHANICAL DRIVE

Frequently Asked Questions

What is NSN 5120-01-240-0666?

NSN 5120-01-240-0666 is a Key,socket Head Screw, manufactured by Bondhus Corp, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-01-240-0666?

NSN 5120-01-240-0666 has 3 cross-referenced part numbers: 0257 1317 (Blackwood J. Blackwood & Son Pty Ltd), BS4 (Bondhus Corp), 10660 (Bondhus Corp).

What NSN replaces 5120-01-240-0666?

There are 12 known substitutes for 5120-01-240-0666: 5315-00-188-9486, 4320-00-218-3820, 5950-00-401-7348 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of BS4?

Key specifications for BS4: Blade Length: 97.0 MILLIMETERS NOMINAL MM; Material: STEEL WRENCHING SURFACE; Overall Length: 170.0 MILLIMETERS NOMINAL MM; Features Provided: BALL END. 9 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com