PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B18.3Key,socket Head Screw

The American Society of Mechanical Engineers · NSN 5120-00-596-1236 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-596-1236 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-596-1236. Primary manufacturer part number: B18.3.
Features
  • Key,socket Head Screw — FSC 5120
  • Short Arm Length: 0.250 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
  • Style Designator: L-HANDLE
  • Wrenching Surface Shape: HEXAGON BOTH ENDS EXTERNAL
  • Long Arm Length: 2.578 INCHES MINIMUM AND 2.766 INCHES MAXIMUM IN
  • Wrenching Surface Size: 0.035 INCHES NOMINAL BOTH ENDS IN
  • Specification/standard Data: 05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Material: STEEL OVERALL
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 5120-00-596-1236, 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 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 5 manufacturers, 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
NSN5120-00-596-1236
Primary Part NumberB18.3
Item NameKey,socket Head Screw
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe American Society of Mechanical Engineers
StatusACTIVE
Short Arm Length0.250 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
Style DesignatorL-HANDLE
Wrenching Surface ShapeHEXAGON BOTH ENDS EXTERNAL
Long Arm Length2.578 INCHES MINIMUM AND 2.766 INCHES MAXIMUM IN
Wrenching Surface Size0.035 INCHES NOMINAL BOTH ENDS IN
Specification/standard Data05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
MaterialSTEEL OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
5930-00-857-8809 INTERCHANGEABLE
Switch Assembly
2915-00-940-9398 INTERCHANGEABLE
Inner Shell Assembly,fuel Contro
4470-01-039-4127 INTERCHANGEABLE
Pellet,nylon Special
6605-01-268-0543 INTERCHANGEABLE
Compass,magnetic,mounted
2920-01-434-030387-19674A2 INTERCHANGEABLE
Switch,engine Starter,electrical
Brunswick Corp Dba Mercury Marine Div Mercury Marine
2510-01-519-51673KK136 INTERCHANGEABLE
Panel,vehicular Operation
Oshkosh Defense Llc
5330-01-734-2869101691 INTERCHANGEABLE
Ring,wiper
Naval Surface Warfare Center Dahlgren Div
Cross-Reference Index
Part NumberManufacturer
B18.3 The American Society of Mechanical Engineers (USA)
GGG-K-275 TY1CL2 General Services Administration Federal Supply Service (USA)
A-A-2473 Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA)
101691 Allen Mfg Co Sub of Chicago Pneumatic Tool Co (USA)
GGG-K-275 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
Related Parts
5930-00-857-8809INTERCHANGEABLE
SWITCH ASSEMBLY
2915-00-940-9398INTERCHANGEABLE
INNER SHELL ASSEMBLY,FUEL CONTRO
4470-01-039-4127INTERCHANGEABLE
PELLET,NYLON SPECIAL
6605-01-268-0543INTERCHANGEABLE
COMPASS,MAGNETIC,MOUNTED
2920-01-434-0303INTERCHANGEABLE
SWITCH,ENGINE STARTER,ELECTRICAL
87-19674A2
2510-01-519-5167INTERCHANGEABLE
PANEL,VEHICULAR OPERATION
3KK136
5330-01-734-2869INTERCHANGEABLE
RING,WIPER
101691

Frequently Asked Questions

What is NSN 5120-00-596-1236?

NSN 5120-00-596-1236 is a Key,socket Head Screw, manufactured by The American Society of Mechanical Engineers, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-00-596-1236?

NSN 5120-00-596-1236 has 5 cross-referenced part numbers: B18.3 (The American Society of Mechanical Engineers), GGG-K-275 TY1CL2 (General Services Administration Federal Supply Service), A-A-2473 (Federal Commercial Item Description Promulgated by General Services Administration Washington DC), 101691 (Allen Mfg Co Sub of Chicago Pneumatic Tool Co), GGG-K-275 (Federal Specifications Promulgated by General Services Administration Washington DC).

What NSN replaces 5120-00-596-1236?

There are 7 known substitutes for 5120-00-596-1236: 5930-00-857-8809, 2915-00-940-9398, 4470-01-039-4127 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of B18.3?

Key specifications for B18.3: Overall Length: 2.613 INCHES MINIMUM AND 2.801 INCHES MAXIMUM IN; Short Arm Length: 0.250 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN; Style Designator: L-HANDLE; Wrenching Surface Shape: HEXAGON BOTH ENDS EXTERNAL. 8 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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