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Technical Data Sheet
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21666 ✓ Verified by PartsTable
EIZO · PIPE SECTION
WHAT YOU NEED TO KNOW
Schedule = wall thickness, NOT diameter Nominal pipe size != actual OD
Sch 40 and Sch 80 same OD, different wall
PRODUCT OVERVIEW

Neckband headset with adjustable microphone, for hands-free communication. Key specifications include shaft_end_type: SPLINED INVOLUTE, shaft_material: STEEL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4710-00-010-9595, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
21666
NSN: 4710-00-010-9595
FSC: 4710
CAGE: 78710 — TRIUMPH CONTROLS, LLC DBA TRIUMPH CONTROLS, LLC (USA)
SPECIFICATIONS
shaft_end_typeSPLINED INVOLUTE
shaft_materialSTEEL
NSN4710-00-010-9595
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: 21666 · EIZO ⚠ VERIFY BEFORE ORDERING Schedule = wall thickness, NOT pipe diameter. Sch 40 and Sch 80 have the same OD but different wall thickness. Nominal pipe size ≠ actual OD — a 1" pipe is actually 1.315" OD ✓ BROKER TIP Sch 40 = standard wall, Sch 80 = heavy wall (higher pressure), Sch 160 = extra heavy. Seamless pipe is required for high-pressure applications — welded pipe has lower ratings PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
WALL THICKNESS: 0.077 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.500 INCHES SINGLE END IN
•
DESIGN FORM: PREBENT
•
MATING END QUANTITY: 2 SINGLE END
•
THREAD SERIES DESIGNATOR: UNF SINGLE END
•
MATERIAL: ALUMINUM ALLOY SINGLE END
•
TUBE OUTSIDE DIAMETER: 0.271 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 33.0 SINGLE END
TECHNICAL CHARACTERISTICS (FLIS)
WALL THICKNESS0.077 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.500 INCHES SINGLE END IN
DESIGN FORMPREBENT
MATING END QUANTITY2 SINGLE END
THREAD SERIES DESIGNATORUNF SINGLE END
MATERIALALUMINUM ALLOY SINGLE END
TUBE OUTSIDE DIAMETER0.271 INCHES NOMINAL IN
SEAT ANGLE IN DEG33.0 SINGLE END
MATERIALALUMINUM ALLOY TUBING
END CONNECTION STYLEUNTHREADED INTERNAL SINGLE END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
3608ACInterchangeable
interchangeable cross-reference
interchangeable
21666Interchangeable
interchangeable cross-reference
interchangeable
24217Interchangeable
interchangeable cross-reference
interchangeable
SA21666Interchangeable
interchangeable cross-reference
interchangeable
35423-2Interchangeable
interchangeable cross-reference
interchangeable
KZ515Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21666?
21666 is a IMPELLER,PUMP,CENTRIFUGAL manufactured by EIZO.
What parts can replace 21666?
There are 10 known substitutes for 21666: 3608AC, 21666, 24217 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21666?
21666 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4710-00-010-9595. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026