PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-T-21309Tang Breakoff Tool,screw Thread

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5120-00-116-9596 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-116-9596 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-116-9596. Primary manufacturer part number: MIL-T-21309.
Features
  • Tang Breakoff Tool,screw Thread — FSC 5120
  • Specification/standard Data: 0U583-SAE AS59158 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Nondefinitive Spec/std Data: 4 TYPE AND 1 CLASS AND B STYLE
  • Thread Size and Series/type Designator: 5/16-24 UNF
  • Unit Type: AUTOMATIC SPRING ACTUATED PUNCH
  • 8 verified cross-references
  • Primary manufacturer: Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Tang Breakoff Tool,screw Thread, cataloged under National Stock Number 5120-00-116-9596, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 8 commercial cross-references from 6 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
NSN5120-00-116-9596
Primary Part NumberMIL-T-21309
Item NameTang Breakoff Tool,screw Thread
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusCANCELLED
Specification/standard Data0U583-SAE AS59158 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Nondefinitive Spec/std Data4 TYPE AND 1 CLASS AND B STYLE
Thread Size and Series/type Designator5/16-24 UNF
Unit TypeAUTOMATIC SPRING ACTUATED PUNCH
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 9
5120-00-370-4026 INTERCHANGEABLE
Tang Breakoff Tool,screw Thread
5120-00-370-4027 INTERCHANGEABLE
Tang Breakoff Tool,screw Thread
5120-00-370-4028 INTERCHANGEABLE
Tang Breakoff Tool,screw Thread
5120-00-370-4032 INTERCHANGEABLE
Tang Breakoff Tool,screw Thread
5120-00-370-4033 INTERCHANGEABLE
Tang Breakoff Tool,screw Thread
5120-00-793-1086 INTERCHANGEABLE
Tang Breakoff Tool,screw Thread
5935-00-949-735336925 INTERCHANGEABLE
Connector,plug,electrical
Amphenol Corporation Div Amphenol Rf
5120-01-073-32983695-5 INTERCHANGEABLE
Tang Breakoff Tool,screw Thread
Stanley Engineered Fastening Llc
5940-01-360-864436925 INTERCHANGEABLE
Terminal,lug
Te Connectivity Corporation
Cross-Reference Index
Part NumberManufacturer
MIL-T-21309 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
3692-5 Stanley Engineered Fastening Llc (USA)
AS59158 Society of Automotive Engineers Inc (USA)
A-A-59158 TY4CL1STB General Services Administration Federal Supply Service (USA)
AS59158 TY4CL1STB General Services Administration Federal Supply Service (USA)
AS59158 Sae International Dba Sae International (USA)
A-A-59158 Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA)
MIL-T-21309 TY4CL1STB General Services Administration Federal Supply Service (USA)
Related Parts
5120-00-370-4026INTERCHANGEABLE
TANG BREAKOFF TOOL,SCREW THREAD
5120-00-370-4027INTERCHANGEABLE
TANG BREAKOFF TOOL,SCREW THREAD
5120-00-370-4028INTERCHANGEABLE
TANG BREAKOFF TOOL,SCREW THREAD
5120-00-370-4032INTERCHANGEABLE
TANG BREAKOFF TOOL,SCREW THREAD
5120-00-370-4033INTERCHANGEABLE
TANG BREAKOFF TOOL,SCREW THREAD
5120-00-793-1086INTERCHANGEABLE
TANG BREAKOFF TOOL,SCREW THREAD
5935-00-949-7353INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
36925
5120-01-073-3298INTERCHANGEABLE
TANG BREAKOFF TOOL,SCREW THREAD
3695-5
5940-01-360-8644INTERCHANGEABLE
TERMINAL,LUG
36925

Frequently Asked Questions

What is NSN 5120-00-116-9596?

NSN 5120-00-116-9596 is a Tang Breakoff Tool,screw Thread, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5120 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5120-00-116-9596?

NSN 5120-00-116-9596 has 8 cross-referenced part numbers: MIL-T-21309 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 3692-5 (Stanley Engineered Fastening Llc), AS59158 (Society of Automotive Engineers Inc), A-A-59158 TY4CL1STB (General Services Administration Federal Supply Service), AS59158 TY4CL1STB (General Services Administration Federal Supply Service) and 3 more.

What NSN replaces 5120-00-116-9596?

There are 9 known substitutes for 5120-00-116-9596: 5120-00-370-4026, 5120-00-370-4027, 5120-00-370-4028 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-T-21309?

Key specifications for MIL-T-21309: Specification/standard Data: 0U583-SAE AS59158 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD; Nondefinitive Spec/std Data: 4 TYPE AND 1 CLASS AND B STYLE; Thread Size and Series/type Designator: 5/16-24 UNF; Unit Type: AUTOMATIC SPRING ACTUATED PUNCH. 4 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5120-00-116-9596 still in active supply?

NSN 5120-00-116-9596 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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