PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-T-21309Inserter,screw Thread Insert

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5120-00-804-6054 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-804-6054 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-804-6054. Primary manufacturer part number: MIL-T-21309.
Features
  • Inserter,screw Thread Insert — FSC 5120
  • Unit Type: MANDREL
  • Specification/standard Data: 0U583-SAE AS59158 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
  • Nondefinitive Spec/std Data: 3 TYPE AND 2 CLASS AND B STYLE
  • Thread Size and Series/type Designator: 1-8 UNIFIED NATIONAL COARSE (UNC)
  • 9 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 Inserter,screw Thread Insert, cataloged under National Stock Number 5120-00-804-6054, 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 9 commercial cross-references from 7 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-00-804-6054
Primary Part NumberMIL-T-21309
Item NameInserter,screw Thread Insert
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Unit TypeMANDREL
Specification/standard Data0U583-SAE AS59158 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
Nondefinitive Spec/std Data3 TYPE AND 2 CLASS AND B STYLE
Thread Size and Series/type Designator1-8 UNIFIED NATIONAL COARSE (UNC)
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
5120-00-555-9497 INTERCHANGEABLE
Inserter,screw Thread Insert
3120-00-662-56273-72416 INTERCHANGEABLE
Bearing,sleeve
The Boeing Company Div Defense
5120-00-804-6052 INTERCHANGEABLE
Inserter,screw Thread Insert
5120-00-804-6053 INTERCHANGEABLE
Inserter,screw Thread Insert
5120-01-032-40503724-20 INTERCHANGEABLE
Inserter,screw Thread Insert
Stanley Engineered Fastening Llc
Cross-Reference Index
Part NumberManufacturer
MIL-T-21309 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
AS59158 Society of Automotive Engineers Inc (USA)
MIL-T-21309 TY3CL2STB General Services Administration Federal Supply Service (USA)
AS59158 TY3CL2STB General Services Administration Federal Supply Service (USA)
A-A-59158 Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA)
1005284-6 Emerson Power Transmission Corporation Dba Emerson Div Emerson Power Transmission Division (USA)
A-A-59158 TY3CL2STB General Services Administration Federal Supply Service (USA)
AS59158 Sae International Dba Sae International (USA)
3724-16 Stanley Engineered Fastening Llc (USA)
Related Parts
5120-00-555-9497INTERCHANGEABLE
INSERTER,SCREW THREAD INSERT
3120-00-662-5627INTERCHANGEABLE
BEARING,SLEEVE
3-72416
5120-00-804-6052INTERCHANGEABLE
INSERTER,SCREW THREAD INSERT
5120-00-804-6053INTERCHANGEABLE
INSERTER,SCREW THREAD INSERT
5120-01-032-4050INTERCHANGEABLE
INSERTER,SCREW THREAD INSERT
3724-20

Frequently Asked Questions

What is NSN 5120-00-804-6054?

NSN 5120-00-804-6054 is a Inserter,screw Thread Insert, 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: active.

What are the part numbers for NSN 5120-00-804-6054?

NSN 5120-00-804-6054 has 9 cross-referenced part numbers: MIL-T-21309 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), AS59158 (Society of Automotive Engineers Inc), MIL-T-21309 TY3CL2STB (General Services Administration Federal Supply Service), AS59158 TY3CL2STB (General Services Administration Federal Supply Service), A-A-59158 (Federal Commercial Item Description Promulgated by General Services Administration Washington DC) and 4 more.

What NSN replaces 5120-00-804-6054?

There are 5 known substitutes for 5120-00-804-6054: 5120-00-555-9497, 3120-00-662-5627, 5120-00-804-6052 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-T-21309?

Key specifications for MIL-T-21309: Unit Type: MANDREL; Specification/standard Data: 0U583-SAE AS59158 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD; Nondefinitive Spec/std Data: 3 TYPE AND 2 CLASS AND B STYLE; Thread Size and Series/type Designator: 1-8 UNIFIED NATIONAL COARSE (UNC). 4 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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