PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-DTL-18866Tee,tube to Boss

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 4730-00-800-1735 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-00-800-1735 — this item is cataloged by the U.S. Government under National Stock Number 4730-00-800-1735. Primary manufacturer part number: MIL-DTL-18866.
Features
  • Tee,tube to Boss — FSC 4730
  • Maximum Operating Temp: 121.0 CELSIUS SINGLE RESPONSE DEGC
  • Nominal Outside Diameter Tube Accommodated: 0.500 INCHES SECOND END IN
  • Leg Length: 1.250 INCHES NOMINAL FIRST END IN
  • Media for Which Designed: AIR SECOND RESPONSE
  • Operating Pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
  • Specification/standard Data: 96906-MS51892 GOVERNMENT STANDARD
  • Media for Which Designed: HYDRAULIC FLUID FIRST RESPONSE
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
  • Applications requiring Steel Overall construction
General Description

The Tee,tube to Boss, cataloged under National Stock Number 4730-00-800-1735, is classified within Federal Supply Class 4730 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings 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 25 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4730-00-800-1735
Primary Part NumberMIL-DTL-18866
Item NameTee,tube to Boss
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Maximum Operating Temp121.0 CELSIUS SINGLE RESPONSE DEGC
Nominal Outside Diameter Tube Accommodated0.500 INCHES SECOND END IN
Leg Length1.250 INCHES NOMINAL FIRST END IN
Media for Which DesignedAIR SECOND RESPONSE
Operating Pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Specification/standard Data96906-MS51892 GOVERNMENT STANDARD
Media for Which DesignedHYDRAULIC FLUID FIRST RESPONSE
Surface Treatment Document and ClassificationMIL-C-16232 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
Nominal Thread Size0.750 INCHES ALL ENDS IN
Nondefinitive Spec/std Data14A FIGURE AND 19 TABLE A
Seat Angle12.0 DEGREES FIRST END
Nominal Outside Diameter Tube Accommodated0.500 INCHES FIRST END IN
MaterialSTEEL OVERALL
Furnished Items and Quantity1 LOCKNUT AND 1 PREFORMED PACKING
Thread Series DesignatorUNF ALL ENDS
Surface TreatmentPHOSPHATE OVERALL
Connection TypeTHREADED EXTERNAL BOSS SECOND END
Connection StyleFLARELESS (TUBE) FIRST END
Connection StyleFLARELESS (TUBE) THIRD END
Seat Angle12.0 DEGREES THIRD END
Connection StyleEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
Thread Class2A ALL ENDS A
Leg Length1.438 INCHES NOMINAL SECOND END IN
Connection TypeTHREADED EXTERNAL TUBE FIRST END
Connection TypeTHREADED EXTERNAL TUBE THIRD END
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4730-00-466-7467 INTERCHANGEABLE
Locknut,tube Fitting
4730-00-727-9786 INTERCHANGEABLE
Elbow,tube
4730-00-800-3121 INTERCHANGEABLE
Sleeve,clinch,tube Fitting
4730-00-800-3129 INTERCHANGEABLE
Sleeve,clinch,tube Fitting
4730-00-800-4790 INTERCHANGEABLE
Nut,tube Coupling
4730-00-801-3466 INTERCHANGEABLE
Nipple,tube
4730-00-849-9692 INTERCHANGEABLE
Tee,tube
4730-01-012-3977 INTERCHANGEABLE
Elbow,tube
4730-01-017-1246 INTERCHANGEABLE
Union,tube
4730-01-017-1457 INTERCHANGEABLE
Nut,tube Coupling
Cross-Reference Index
Part NumberManufacturer
MIL-DTL-18866 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MILF21467 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-F-18866 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-F-21467F1G14ATABLE19 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MS51892-6P Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
MS51892-6PB Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
4730-00-466-7467INTERCHANGEABLE
LOCKNUT,TUBE FITTING
4730-00-727-9786INTERCHANGEABLE
ELBOW,TUBE
4730-00-800-3121INTERCHANGEABLE
SLEEVE,CLINCH,TUBE FITTING
4730-00-800-3129INTERCHANGEABLE
SLEEVE,CLINCH,TUBE FITTING
4730-00-800-4790INTERCHANGEABLE
NUT,TUBE COUPLING
4730-00-801-3466INTERCHANGEABLE
NIPPLE,TUBE
4730-00-849-9692INTERCHANGEABLE
TEE,TUBE
4730-01-012-3977INTERCHANGEABLE
ELBOW,TUBE
4730-01-017-1246INTERCHANGEABLE
UNION,TUBE
4730-01-017-1457INTERCHANGEABLE
NUT,TUBE COUPLING
4730-01-017-1458INTERCHANGEABLE
NUT,TUBE COUPLING
4730-01-020-7517INTERCHANGEABLE
SLEEVE,CLINCH,TUBE FITTING

Frequently Asked Questions

What is NSN 4730-00-800-1735?

NSN 4730-00-800-1735 is a Tee,tube to Boss, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 4730 (No Item Name Available). Status: active.

What are the part numbers for NSN 4730-00-800-1735?

NSN 4730-00-800-1735 has 6 cross-referenced part numbers: MIL-DTL-18866 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MILF21467 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-F-18866 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-F-21467F1G14ATABLE19 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MS51892-6P (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M) and 1 more.

What NSN replaces 4730-00-800-1735?

There are 12 known substitutes for 4730-00-800-1735: 4730-00-466-7467, 4730-00-727-9786, 4730-00-800-3121 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-DTL-18866?

Key specifications for MIL-DTL-18866: Maximum Operating Temp: 121.0 CELSIUS SINGLE RESPONSE DEGC; Nominal Outside Diameter Tube Accommodated: 0.500 INCHES SECOND END IN; Leg Length: 1.250 INCHES NOMINAL FIRST END IN; Media for Which Designed: AIR SECOND RESPONSE. 25 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com