PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-T-21309 TY4CL3Tang Breakoff Tool,screw Thread

General Services Administration Federal Supply Service · NSN 5120-00-777-3814 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-777-3814 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-777-3814. Primary manufacturer part number: MIL-T-21309 TY4CL3.
Features
  • Tang Breakoff Tool,screw Thread — FSC 5120
  • Unit Type: SOLID PUNCH
  • Thread Size and Series/type Designator: 10-24 UNIFIED NATIONAL COARSE (UNC) AND 10-32 UNF
  • Nondefinitive Spec/std Data: 4 TYPE AND 3 CLASS
  • 2 verified cross-references
  • Primary manufacturer: General Services Administration Federal Supply Service
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Tang Breakoff Tool,screw Thread, cataloged under National Stock Number 5120-00-777-3814, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is General Services Administration Federal Supply Service. Government technical data includes 3 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. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-00-777-3814
Primary Part NumberMIL-T-21309 TY4CL3
Item NameTang Breakoff Tool,screw Thread
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerGeneral Services Administration Federal Supply Service
StatusACTIVE
Unit TypeSOLID PUNCH
Thread Size and Series/type Designator10-24 UNIFIED NATIONAL COARSE (UNC) AND 10-32 UNF
Nondefinitive Spec/std Data4 TYPE AND 3 CLASS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
5120-00-776-7263 INTERCHANGEABLE
Tang Breakoff Tool,screw Thread
5120-00-776-7266 INTERCHANGEABLE
Tang Breakoff Tool,screw Thread
5120-01-329-7537 INTERCHANGEABLE
Tang Breakoff Tool,screw Thread
Cross-Reference Index
Part NumberManufacturer
MIL-T-21309 TY4CL3 General Services Administration Federal Supply Service (USA)
MIL-T-21309 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5120-00-776-7263INTERCHANGEABLE
TANG BREAKOFF TOOL,SCREW THREAD
5120-00-776-7266INTERCHANGEABLE
TANG BREAKOFF TOOL,SCREW THREAD
5120-01-329-7537INTERCHANGEABLE
TANG BREAKOFF TOOL,SCREW THREAD

Frequently Asked Questions

What is NSN 5120-00-777-3814?

NSN 5120-00-777-3814 is a Tang Breakoff Tool,screw Thread, manufactured by General Services Administration Federal Supply Service, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-00-777-3814?

NSN 5120-00-777-3814 has 2 cross-referenced part numbers: MIL-T-21309 TY4CL3 (General Services Administration Federal Supply Service), MIL-T-21309 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 5120-00-777-3814?

There are 3 known substitutes for 5120-00-777-3814: 5120-00-776-7263, 5120-00-776-7266, 5120-01-329-7537. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-T-21309 TY4CL3?

Key specifications for MIL-T-21309 TY4CL3: Unit Type: SOLID PUNCH; Thread Size and Series/type Designator: 10-24 UNIFIED NATIONAL COARSE (UNC) AND 10-32 UNF; Nondefinitive Spec/std Data: 4 TYPE AND 3 CLASS. 3 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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