PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B18.3Key,socket Head Screw

The American Society of Mechanical Engineers · NSN 5120-00-224-2510 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-224-2510 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-224-2510. Primary manufacturer part number: B18.3.
Features
  • Key,socket Head Screw — FSC 5120
  • Long Arm Length: 6.156 INCHES MINIMUM AND 6.344 INCHES MAXIMUM IN
  • Short Arm Length: 1.781 INCHES MINIMUM AND 1.969 INCHES MAXIMUM IN
  • Features Provided: SHORT SERIES
  • Wrenching Surface Size: 0.625 INCHES NOMINAL BOTH ENDS IN
  • Style Designator: L-HANDLE
  • Wrenching Surface Shape: HEXAGON BOTH ENDS EXTERNAL
  • Specification/standard Data: 05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Key,socket Head Screw, cataloged under National Stock Number 5120-00-224-2510, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is The American Society of Mechanical Engineers. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 13 commercial cross-references from 12 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5120-00-224-2510
Primary Part NumberB18.3
Item NameKey,socket Head Screw
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe American Society of Mechanical Engineers
StatusCANCELLED
Long Arm Length6.156 INCHES MINIMUM AND 6.344 INCHES MAXIMUM IN
Short Arm Length1.781 INCHES MINIMUM AND 1.969 INCHES MAXIMUM IN
Features ProvidedSHORT SERIES
Wrenching Surface Size0.625 INCHES NOMINAL BOTH ENDS IN
Style DesignatorL-HANDLE
Wrenching Surface ShapeHEXAGON BOTH ENDS EXTERNAL
Specification/standard Data05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
MaterialSTEEL OVERALL
Environmental Attribute CodePLASTICS REMOVAL IN THE MARINE ENVIRONMENT (PRIME) PRODUCT
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
3433-00-161-7526 INTERCHANGEABLE
Tip,welding Torch
5940-00-259-57451222860-2 INTERCHANGEABLE
Terminal,stud
Honeywell Intl Inc Defense Avionics Systems
2930-00-366-0647820 INTERCHANGEABLE
Pump,cooling System,engine
Elgin Industries Inc. Dba
6685-00-515-5094076253 INTERCHANGEABLE
Gage,pressure,dial Indicating
Ametek, Inc. Div Aerospace & Defense
3439-00-918-7920AW20 INTERCHANGEABLE
Heat Sink,soldering Aid
Ripley Co Inc
6530-01-049-182968018 INTERCHANGEABLE
Wrapper,sterilization
Kimberly-Clark Corporation
5330-01-230-160868018 INTERCHANGEABLE
Gasket
Reidville Hydraulics & Mfg Inc
6530-01-299-8049MA-180-89 INTERCHANGEABLE
Wrapper,sterilization
U S Dept of Veterans Affairs
5310-01-303-646457036 INTERCHANGEABLE
Washer
Prestolite Electric Inc
5120-01-428-7934AW20D INTERCHANGEABLE
Key,socket Head Screw
Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
Cross-Reference Index
Part NumberManufacturer
B18.3 The American Society of Mechanical Engineers (USA)
A-A-2473 Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA)
AW20 Sna Germany Gmbh (DEU)
10424479 Nimikkeistokeskus Ncb Finland (FIN)
68018 Allen Mfg Co Sub of Chicago Pneumatic Tool Co (USA)
GGG-K-275 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
57036 Apex Tool Group, Llc Dba Nicholson (USA)
1091883 Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA)
1940710 Naval Ship Systems Command (USA)
5120002242510 Etablissement Central De Gestion Etde Stockage Du Materiel
57036 Easco Hand Tools Inc Dba Danaher Tool Group Div Danaher Tool Group Easco Hand Tools Inc. (USA)
AW20D Sna Germany Gmbh (DEU)
GGG-K-275 TY1CL1 General Services Administration Federal Supply Service (USA)
Related Parts
3433-00-161-7526INTERCHANGEABLE
TIP,WELDING TORCH
5940-00-259-5745INTERCHANGEABLE
TERMINAL,STUD
1222860-2
2930-00-366-0647INTERCHANGEABLE
PUMP,COOLING SYSTEM,ENGINE
820
6685-00-515-5094INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
076253
3439-00-918-7920INTERCHANGEABLE
HEAT SINK,SOLDERING AID
AW20
6530-01-049-1829INTERCHANGEABLE
WRAPPER,STERILIZATION
68018
5330-01-230-1608INTERCHANGEABLE
GASKET
68018
6530-01-299-8049INTERCHANGEABLE
WRAPPER,STERILIZATION
MA-180-89
5310-01-303-6464INTERCHANGEABLE
WASHER
57036
5120-01-428-7934INTERCHANGEABLE
KEY,SOCKET HEAD SCREW
AW20D
5120-01-437-7908INTERCHANGEABLE
KEY,SOCKET HEAD SCREW
5998-01-492-2706INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY

Frequently Asked Questions

What is NSN 5120-00-224-2510?

NSN 5120-00-224-2510 is a Key,socket Head Screw, manufactured by The American Society of Mechanical Engineers, classified under FSC 5120 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5120-00-224-2510?

NSN 5120-00-224-2510 has 13 cross-referenced part numbers: B18.3 (The American Society of Mechanical Engineers), A-A-2473 (Federal Commercial Item Description Promulgated by General Services Administration Washington DC), AW20 (Sna Germany Gmbh), 10424479 (Nimikkeistokeskus Ncb Finland), 68018 (Allen Mfg Co Sub of Chicago Pneumatic Tool Co) and 8 more.

What NSN replaces 5120-00-224-2510?

There are 12 known substitutes for 5120-00-224-2510: 3433-00-161-7526, 5940-00-259-5745, 2930-00-366-0647 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of B18.3?

Key specifications for B18.3: Overall Length: 6.779 INCHES MINIMUM AND 6.969 INCHES MAXIMUM IN; Long Arm Length: 6.156 INCHES MINIMUM AND 6.344 INCHES MAXIMUM IN; Short Arm Length: 1.781 INCHES MINIMUM AND 1.969 INCHES MAXIMUM IN; Features Provided: SHORT SERIES. 10 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5120-00-224-2510 still in active supply?

NSN 5120-00-224-2510 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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