PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21657Hose Assembly,nonmetallic

Penflex Inc · NSN 4720-01-434-7947 · FSC 4720 · No Item Name Available
Verified by PartsTable
NSN 4720-01-434-7947 — this item is cataloged by the U.S. Government under National Stock Number 4720-01-434-7947. Primary manufacturer part number: 21657.
Features
  • Hose Assembly,nonmetallic — FSC 4720
  • Layer Composition and Location: 1ST LAYER BRAIDED CORROSION RESISTANT STEEL WIRE
  • Inside Surface Condition: SMOOTH
  • Layer Composition and Location: OUTER LAYER SPIRALLY LAID STEEL WIRE
  • Cross-Sectional Shape Style: ROUND
  • Inside Diameter: 0.750 INCHES NOMINAL IN
  • 1 verified cross-reference
  • Primary manufacturer: Penflex Inc
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
General Description

The Hose Assembly,nonmetallic, cataloged under National Stock Number 4720-01-434-7947, is classified within Federal Supply Class 4720 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings group. The primary manufacturer of record is Penflex Inc. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4720-01-434-7947
Primary Part Number21657
Item NameHose Assembly,nonmetallic
FSC / FSG4720 / 47 — No Item Name Available
ManufacturerPenflex Inc
StatusACTIVE
Layer Composition and Location1ST LAYER BRAIDED CORROSION RESISTANT STEEL WIRE
Inside Surface ConditionSMOOTH
Layer Composition and LocationOUTER LAYER SPIRALLY LAID STEEL WIRE
Cross-Sectional Shape StyleROUND
Inside Diameter0.750 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
5905-00-115-7216 INTERCHANGEABLE
Resistor,variable,wire Wound,non
2530-00-350-64925590650 INTERCHANGEABLE
Filter,fluid
U S Army Tank Automotive Command Amsta-Im-Mm
6685-00-488-5591 INTERCHANGEABLE
Thermometer,self-Indicating,bime
5330-00-997-1909 INTERCHANGEABLE
Packing,preformed
4730-01-036-9487 INTERCHANGEABLE
Adapter,straight,pipe to Boss
5310-01-327-906421657 INTERCHANGEABLE
Washer,spring Tension
Parker Hannifin Corporation Div Hydraulic Systems Division
5895-01-384-562321657 INTERCHANGEABLE
Modem,communications
Motorola/codex Corp Sub of Motorola Inc
5310-01-413-899621657 INTERCHANGEABLE
Washer,spring Tension
Industrial Technologies and Services Llc
4140-01-545-680021657 INTERCHANGEABLE
Fan,circulating
Itw Gse Inc.
5963-01-652-9908 INTERCHANGEABLE
Electronic Module,standardized
Cross-Reference Index
Part NumberManufacturer
21657 Penflex Inc (USA)
Related Parts
5905-00-115-7216INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,NON
2530-00-350-6492INTERCHANGEABLE
FILTER,FLUID
5590650
6685-00-488-5591INTERCHANGEABLE
THERMOMETER,SELF-INDICATING,BIME
5330-00-997-1909INTERCHANGEABLE
PACKING,PREFORMED
4730-01-036-9487INTERCHANGEABLE
ADAPTER,STRAIGHT,PIPE TO BOSS
5310-01-327-9064INTERCHANGEABLE
WASHER,SPRING TENSION
21657
5895-01-384-5623INTERCHANGEABLE
MODEM,COMMUNICATIONS
21657
5310-01-413-8996INTERCHANGEABLE
WASHER,SPRING TENSION
21657
4140-01-545-6800INTERCHANGEABLE
FAN,CIRCULATING
21657
5963-01-652-9908INTERCHANGEABLE
ELECTRONIC MODULE,STANDARDIZED

Frequently Asked Questions

What is NSN 4720-01-434-7947?

NSN 4720-01-434-7947 is a Hose Assembly,nonmetallic, manufactured by Penflex Inc, classified under FSC 4720 (No Item Name Available). Status: active.

What are the part numbers for NSN 4720-01-434-7947?

NSN 4720-01-434-7947 has 1 cross-referenced part number: 21657 (Penflex Inc).

What NSN replaces 4720-01-434-7947?

There are 10 known substitutes for 4720-01-434-7947: 5905-00-115-7216, 2530-00-350-6492, 6685-00-488-5591 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21657?

Key specifications for 21657: End Item Identification: W/S CODE, ARLEIGH BURKE CLASS DDG; Layer Composition and Location: 1ST LAYER BRAIDED CORROSION RESISTANT STEEL WIRE; Inside Surface Condition: SMOOTH; Layer Composition and Location: OUTER LAYER SPIRALLY LAID STEEL WIRE. 6 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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