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Technical Data Sheet
PartsTable / COMPONENT / 21990-1
21990-1 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The CIRCUIT CARD ASSEMBLY is a the manufacturer industrial component. Key specifications include end_item_identification: USED ON ASR9 EQUIPMENT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-196-1997, 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
21990-1
NSN: 4730-00-196-1997
FSC: 4730
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
end_item_identificationUSED ON ASR9 EQUIPMENT
NSN4730-00-196-1997
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 21990-1 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM B43 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD SERIES DESIGNATOR: NPT ALL ENDS
•
MATERIAL: COPPER ALLOY 230 OVERALL
•
CONNECTION TYPE: THREADED EXTERNAL PIPE ALL ENDS
•
SPECIFICATION/STANDARD DATA: 81346-ASTM B687 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
NOMINAL THREAD SIZE: 0.500 INCHES ALL ENDS IN
•
CONNECTION STYLE: PLAIN (PIPE) ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B43 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD SERIES DESIGNATORNPT ALL ENDS
MATERIALCOPPER ALLOY 230 OVERALL
CONNECTION TYPETHREADED EXTERNAL PIPE ALL ENDS
SPECIFICATION/STANDARD DATA81346-ASTM B687 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NOMINAL THREAD SIZE0.500 INCHES ALL ENDS IN
THREAD SERIES DESIGNATORNPT ALL ENDS
CONNECTION STYLEPLAIN (PIPE) ALL ENDS
NOMINAL OVERALL LENGTH5.500 INCHES IN
MATERIALCOPPER ALLOY 230 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
002195Interchangeable
interchangeable cross-reference
interchangeable
21990-1Interchangeable
interchangeable cross-reference
interchangeable
MS51846-71Interchangeable
Same NIIN cross-reference
interchangeable
ASTM-B687Interchangeable
Same NIIN cross-reference
interchangeable
WWN351Interchangeable
Same NIIN cross-reference
interchangeable
528-1-2X5-1-2Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21990-1?
21990-1 is a CIRCUIT CARD ASSEMBLY.
What parts can replace 21990-1?
There are 7 known substitutes for 21990-1: 002195, 21990-1, MS51846-71 and 4 more. Substitute compatibility should be verified for your specific system.
Is 21990-1 still available?
21990-1 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026