PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21657Adapter,straight,pipe to Boss

Spx Corporation Dba Dielectric Communications Div Spx Communication Technologies · NSN 4730-01-036-9487 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-01-036-9487 — this item is cataloged by the U.S. Government under National Stock Number 4730-01-036-9487. Primary manufacturer part number: 21657.
Features
  • Adapter,straight,pipe to Boss — FSC 4730
  • Nominal Thread Size: 0.937 INCHES SECOND END IN
  • Connection Type: THREADED INTERNAL PIPE FIRST END
  • Thread Quantity Per Inch: 26 SECOND END
  • Surface Treatment: CADMIUM OVERALL
  • Connection Type: THREADED EXTERNAL BOSS SECOND END
  • Nominal Overall Length: 0.910 INCHES IN
  • Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
  • Applications requiring Copper Alloy Overall construction
General Description

The Adapter,straight,pipe to Boss, cataloged under National Stock Number 4730-01-036-9487, 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 Spx Corporation Dba Dielectric Communications Div Spx Communication Technologies. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references 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
NSN4730-01-036-9487
Primary Part Number21657
Item NameAdapter,straight,pipe to Boss
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerSpx Corporation Dba Dielectric Communications Div Spx Communication Technologies
StatusACTIVE
Nominal Thread Size0.937 INCHES SECOND END IN
Connection TypeTHREADED INTERNAL PIPE FIRST END
Thread Quantity Per Inch26 SECOND END
Surface TreatmentCADMIUM OVERALL
Connection TypeTHREADED EXTERNAL BOSS SECOND END
Nominal Overall Length0.910 INCHES IN
Connection StyleEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
Nominal Thread Size0.375 INCHES FIRST END IN
Connection StylePLAIN (PIPE) FIRST END
MaterialCOPPER ALLOY OVERALL
Thread Series DesignatorUNS SECOND END
Thread Class3A SECOND END A
Thread Series DesignatorNPT FIRST END
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
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
4720-01-434-7947 INTERCHANGEABLE
Hose Assembly,nonmetallic
4140-01-545-680021657 INTERCHANGEABLE
Fan,circulating
Itw Gse Inc.
5963-01-652-9908 INTERCHANGEABLE
Electronic Module,standardized
Cross-Reference Index
Part NumberManufacturer
21657 Spx Corporation Dba Dielectric Communications Div Spx Communication Technologies (USA)
A21657-1 Spx Corporation Dba Dielectric Communications Div Spx Communication Technologies (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
5310-01-327-9064INTERCHANGEABLE
WASHER,SPRING TENSION
21657
5895-01-384-5623INTERCHANGEABLE
MODEM,COMMUNICATIONS
21657
5310-01-413-8996INTERCHANGEABLE
WASHER,SPRING TENSION
21657
4720-01-434-7947INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
4140-01-545-6800INTERCHANGEABLE
FAN,CIRCULATING
21657
5963-01-652-9908INTERCHANGEABLE
ELECTRONIC MODULE,STANDARDIZED

Frequently Asked Questions

What is NSN 4730-01-036-9487?

NSN 4730-01-036-9487 is a Adapter,straight,pipe to Boss, manufactured by Spx Corporation Dba Dielectric Communications Div Spx Communication Technologies, classified under FSC 4730 (No Item Name Available). Status: active.

What are the part numbers for NSN 4730-01-036-9487?

NSN 4730-01-036-9487 has 2 cross-referenced part numbers: 21657 (Spx Corporation Dba Dielectric Communications Div Spx Communication Technologies), A21657-1 (Spx Corporation Dba Dielectric Communications Div Spx Communication Technologies).

What NSN replaces 4730-01-036-9487?

There are 10 known substitutes for 4730-01-036-9487: 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: Nominal Thread Size: 0.937 INCHES SECOND END IN; Connection Type: THREADED INTERNAL PIPE FIRST END; Thread Quantity Per Inch: 26 SECOND END; Surface Treatment: CADMIUM OVERALL. 13 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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