PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21-159Elbow,hose

Hii Unmanned Systems, Inc · NSN 4730-01-689-2973 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-01-689-2973 — this item is cataloged by the U.S. Government under National Stock Number 4730-01-689-2973. Primary manufacturer part number: 21-159.
Features
  • Elbow,hose — FSC 4730
  • 3 verified cross-references
  • Primary manufacturer: Hii Unmanned Systems, Inc
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
General Description

The Elbow,hose, cataloged under National Stock Number 4730-01-689-2973, 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 Hii Unmanned Systems, Inc. This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameElbow,hose
FSC / FSG4730 — No Item Name Available (FSG 47)
ManufacturersHii Unmanned Systems, Inc (CAGE 4Z5A9); Bluezone Group Pty Limited (CAGE Z0ZT6); Leidos Australia Pty Limited (CAGE Z0YR8)
Technical Specifications
ParameterValue
NSN4730-01-689-2973
Primary Part Number21-159
Item NameElbow,hose
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerHii Unmanned Systems, Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
3110-00-004-343921159 INTERCHANGEABLE
Bearing,ball,annular
Industrial Technologies and Services Llc
3010-00-441-9992211-59 INTERCHANGEABLE
Coupling,shaft,flexible
Ontic Engineering & Manufacturing, Inc Dba Ontic Us
5999-01-096-664507-9031-0062 INTERCHANGEABLE
Shielding Gasket,electronic
Parker-Hannifin Corporation Dba Pneutronics Div Chomerics Division
5815-01-171-1603 INTERCHANGEABLE
Switch Board Assy
5330-01-207-246821159 INTERCHANGEABLE
Parts Kit,seal Replacement,mecha
Parker Hannifin Corporation Div Hydraulic Systems Division
6625-01-223-2980 INTERCHANGEABLE
Ohmmeter
5330-01-291-9098 INTERCHANGEABLE
Seal,plain Encased
5950-01-407-3077H8000074-001 INTERCHANGEABLE
Reactor
Raytheon Company Dba Raytheon
5305-01-631-291502-031012 INTERCHANGEABLE
Screw,cap,socket Head
Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace
Cross-Reference Index
Part NumberManufacturer
21-159 Hii Unmanned Systems, Inc (USA)
21-159 Bluezone Group Pty Limited (AUS)
21-159 Leidos Australia Pty Limited (AUS)
Related Parts
3110-00-004-3439INTERCHANGEABLE
BEARING,BALL,ANNULAR
21159
3010-00-441-9992INTERCHANGEABLE
COUPLING,SHAFT,FLEXIBLE
211-59
5999-01-096-6645INTERCHANGEABLE
SHIELDING GASKET,ELECTRONIC
07-9031-0062
5815-01-171-1603INTERCHANGEABLE
SWITCH BOARD ASSY
5330-01-207-2468INTERCHANGEABLE
PARTS KIT,SEAL REPLACEMENT,MECHA
21159
6625-01-223-2980INTERCHANGEABLE
OHMMETER
5330-01-291-9098INTERCHANGEABLE
SEAL,PLAIN ENCASED
5950-01-407-3077INTERCHANGEABLE
REACTOR
H8000074-001
5305-01-631-2915INTERCHANGEABLE
SCREW,CAP,SOCKET HEAD
02-031012

Frequently Asked Questions

What is NSN 4730-01-689-2973?

NSN 4730-01-689-2973 is a Elbow,hose, manufactured by Hii Unmanned Systems, Inc, classified under FSC 4730 (No Item Name Available). Status: active.

What are the part numbers for NSN 4730-01-689-2973?

NSN 4730-01-689-2973 has 3 cross-referenced part numbers: 21-159 (Hii Unmanned Systems, Inc), 21-159 (Bluezone Group Pty Limited), 21-159 (Leidos Australia Pty Limited).

What NSN replaces 4730-01-689-2973?

There are 9 known substitutes for 4730-01-689-2973: 3110-00-004-3439, 3010-00-441-9992, 5999-01-096-6645 and 6 more. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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