PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B18.3Key,socket Head Screw

The American Society of Mechanical Engineers · NSN 5120-01-367-3243 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-01-367-3243 — this item is cataloged by the U.S. Government under National Stock Number 5120-01-367-3243. Primary manufacturer part number: B18.3.
Features
  • Key,socket Head Screw — FSC 5120
  • Specification/standard Data: 05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Style Designator: L-HANDLE
  • Wrenching Surface Shape: SPLINE BOTH ENDS EXTERNAL
  • Wrenching Surface Flute Quantity: 6
  • Wrenching Surface Size: 0.110 INCHES NOMINAL BOTH ENDS IN
  • Material: STEEL OVERALL
  • 3 verified cross-references
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 5120-01-367-3243, 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 6 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. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5120-01-367-3243
Primary Part NumberB18.3
Item NameKey,socket Head Screw
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerThe American Society of Mechanical Engineers
StatusCANCELLED
Specification/standard Data05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Style DesignatorL-HANDLE
Wrenching Surface ShapeSPLINE BOTH ENDS EXTERNAL
Wrenching Surface Flute Quantity6
Wrenching Surface Size0.110 INCHES NOMINAL BOTH ENDS IN
MaterialSTEEL OVERALL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 9
5999-00-083-2111 INTERCHANGEABLE
Heat Sink,electrical-Electronic
3110-00-151-81351000R174 INTERCHANGEABLE
Bearing,ball,annular
Raytheon Company Dba Raytheon Co
3110-00-155-8890 INTERCHANGEABLE
Bearing,ball,annular
6540-00-660-014311310 INTERCHANGEABLE
Prism Set,ophthalmic
Gulden Ophthalmics Inc.
5999-00-938-629377C707934P001 INTERCHANGEABLE
Heat Sink,electrical-Electronic
Lockheed Martin Corporation Div Rms
5950-01-104-4442 INTERCHANGEABLE
Reactor
5935-01-260-5244MS-10 INTERCHANGEABLE
Socket,plug-in Electronic Compon
Power General Corp
6625-01-387-1829MS-10 INTERCHANGEABLE
Meter,power Factor
Wavetek Rf Products, Inc
5330-01-474-4929MS-10 INTERCHANGEABLE
Seal,plain
Rexnord Industries, Llc Div Aerosspace Bearing Operation
Cross-Reference Index
Part NumberManufacturer
B18.3 The American Society of Mechanical Engineers (USA)
MS10 Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
MS10A Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc (USA)
Related Parts
5999-00-083-2111INTERCHANGEABLE
HEAT SINK,ELECTRICAL-ELECTRONIC
3110-00-151-8135INTERCHANGEABLE
BEARING,BALL,ANNULAR
1000R174
3110-00-155-8890INTERCHANGEABLE
BEARING,BALL,ANNULAR
6540-00-660-0143INTERCHANGEABLE
PRISM SET,OPHTHALMIC
11310
5999-00-938-6293INTERCHANGEABLE
HEAT SINK,ELECTRICAL-ELECTRONIC
77C707934P001
5950-01-104-4442INTERCHANGEABLE
REACTOR
5935-01-260-5244INTERCHANGEABLE
SOCKET,PLUG-IN ELECTRONIC COMPON
MS-10
6625-01-387-1829INTERCHANGEABLE
METER,POWER FACTOR
MS-10
5330-01-474-4929INTERCHANGEABLE
SEAL,PLAIN
MS-10

Frequently Asked Questions

What is NSN 5120-01-367-3243?

NSN 5120-01-367-3243 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 5120-01-367-3243?

NSN 5120-01-367-3243 has 3 cross-referenced part numbers: B18.3 (The American Society of Mechanical Engineers), MS10 (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc), MS10A (Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc).

What NSN replaces 5120-01-367-3243?

There are 9 known substitutes for 5120-01-367-3243: 5999-00-083-2111, 3110-00-151-8135, 3110-00-155-8890 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of B18.3?

Key specifications for B18.3: Specification/standard Data: 05047-ASME B18.3 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD; Style Designator: L-HANDLE; Wrenching Surface Shape: SPLINE BOTH ENDS EXTERNAL; Wrenching Surface Flute Quantity: 6. 6 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5120-01-367-3243 still in active supply?

NSN 5120-01-367-3243 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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