PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-F-18866Locknut,tube Fitting

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 4730-01-092-6954 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-01-092-6954 — this item is cataloged by the U.S. Government under National Stock Number 4730-01-092-6954. Primary manufacturer part number: MIL-F-18866.
Features
  • Locknut,tube Fitting — FSC 4730
  • Thread Series: UNF
  • Surface Treatment Document and Classification: QQ-P-35,TY 1 FED SPEC SINGLE TREATMENT RESPONSE OR QQ-P-35 TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
  • Thread Class: 2B
  • Material: STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 308 OR STEEL COMP 309 OR STEEL COMP 309S OR STEEL COMP 310 OR STEEL COMP 310S OR STEEL COMP 314 OR STEEL COMP 316 OR STEEL COMP 316L OR STEEL COMP 317 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OR STEEL COMP 384 OR STEEL COMP 385 OVERALL
  • Surface Treatment: PASSIVATE OVERALL
  • Material Document and Classification: 66 FED STD ALL MATERIAL RESPONSES OVERALL
  • Nominal Thread Size: 0.750 INCHES IN
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
  • Applications requiring Steel Comp 301 or Steel Comp 302 or Steel Comp 302b or Steel Comp 303 or Steel Comp 303SE or Steel Comp 304 or Steel Comp 304l or Steel Comp 305 or Steel Comp 308 or Steel Comp 309 or Steel Comp 309s or Steel Comp 310 or Steel Comp 310s or Steel Comp 314 or Steel Comp 316 or Steel Comp 316l or Steel Comp 317 or Steel Comp 321 or Steel Comp 347 or Steel Comp 348 or Steel Comp 384 or Steel Comp 385 Overall construction
General Description

The Locknut,tube Fitting, cataloged under National Stock Number 4730-01-092-6954, 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 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4730-01-092-6954
Primary Part NumberMIL-F-18866
Item NameLocknut,tube Fitting
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Thread SeriesUNF
Surface Treatment Document and ClassificationQQ-P-35,TY 1 FED SPEC SINGLE TREATMENT RESPONSE OR QQ-P-35 TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Thread Class2B
MaterialSTEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 308 OR STEEL COMP 309 OR STEEL COMP 309S OR STEEL COMP 310 OR STEEL COMP 310S OR STEEL COMP 314 OR STEEL COMP 316 OR STEEL COMP 316L OR STEEL COMP 317 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OR STEEL COMP 384 OR STEEL COMP 385 OVERALL
Surface TreatmentPASSIVATE OVERALL
Material Document and Classification66 FED STD ALL MATERIAL RESPONSES OVERALL
Nominal Thread Size0.750 INCHES IN
Thread Quantity Per Inch16
Thread DirectionRIGHT-HAND
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
5331-00-006-2249 INTERCHANGEABLE
O-Ring
4730-00-727-89138WLNSS INTERCHANGEABLE
Locknut,tube Fitting
Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division
5331-00-808-079410596841-5 INTERCHANGEABLE
O-Ring
Us Army Aviation and Missile Command
5331-01-220-1924 INTERCHANGEABLE
O-Ring
5331-01-273-1002 INTERCHANGEABLE
O-Ring
5330-01-549-8046MS28778-8 INTERCHANGEABLE
Packing,preformed
Curtiss-Wright Flow Control Service, Llc Dba Engineered Arresting Systems - Esco Div Cw Flow Control Svc Llc Dba
5331-01-722-2601MS28778-8 INTERCHANGEABLE
O-Ring
Cdk Mobile Systems Inc
Cross-Reference Index
Part NumberManufacturer
MIL-F-18866 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MS28778-8 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
MIL-DTL-18866 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MS51860-56SS Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5331-00-006-2249INTERCHANGEABLE
O-RING
4730-00-727-8913INTERCHANGEABLE
LOCKNUT,TUBE FITTING
8WLNSS
5331-00-808-0794INTERCHANGEABLE
O-RING
10596841-5
5331-01-220-1924INTERCHANGEABLE
O-RING
5331-01-273-1002INTERCHANGEABLE
O-RING
5330-01-549-8046INTERCHANGEABLE
PACKING,PREFORMED
MS28778-8
5331-01-722-2601INTERCHANGEABLE
O-RING
MS28778-8

Frequently Asked Questions

What is NSN 4730-01-092-6954?

NSN 4730-01-092-6954 is a Locknut,tube Fitting, 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 4730-01-092-6954?

NSN 4730-01-092-6954 has 4 cross-referenced part numbers: MIL-F-18866 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MS28778-8 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MIL-DTL-18866 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MS51860-56SS (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 4730-01-092-6954?

There are 7 known substitutes for 4730-01-092-6954: 5331-00-006-2249, 4730-00-727-8913, 5331-00-808-0794 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-F-18866?

Key specifications for MIL-F-18866: Thread Series: UNF; Surface Treatment Document and Classification: QQ-P-35,TY 1 FED SPEC SINGLE TREATMENT RESPONSE OR QQ-P-35 TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Class: 2B; Material: STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 308 OR STEEL COMP 309 OR STEEL COMP 309S OR STEEL COMP 310 OR STEEL COMP 310S OR STEEL COMP 314 OR STEEL COMP 316 OR STEEL COMP 316L OR STEEL COMP 317 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OR STEEL COMP 384 OR STEEL COMP 385 OVERALL. 9 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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