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Technical Data Sheet
PartsTable / COMPONENT / MS21920-28
MS21920-28 ✓ 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 CLAMP,HOSE is a the manufacturer industrial component. Key specifications include material: STEEL BOLT, temp_rating: 500.0 FAHRENHEIT DEGF, overall_width: 0.655 INCHES NOMINAL IN, inside_diameter: 3.250 INCHES MINIMUM AND 3.500 INCHES MAXIMUM IN, style_designator: BAND, surface_treatment: PASSIVATE BAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-013-2978, 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
MS21920-28
NSN: 4730-00-013-2978
FSC: 4730
CAGE: 66295 — WITTEK COMPANIES INTL INC (USA)
SPECIFICATIONS
materialSTEEL BOLT
temp_rating500.0 FAHRENHEIT DEGF
overall_width0.655 INCHES NOMINAL IN
inside_diameter3.250 INCHES MINIMUM AND 3.500 INCHES MAXIMUM IN
style_designatorBAND
surface_treatmentPASSIVATE BAND
fastening_device_typeSELF-LOCKING HEXAGON NUT
end_item_identificationGRUMMAN A10 AIRCRAFT
NSN4730-00-013-2978
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21920-28 · 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
•
FASTENING DEVICE TYPE: SELF-LOCKING HEXAGON NUT
•
STYLE DESIGNATOR: BAND
•
SURFACE TREATMENT: CADMIUM NUT
•
TEMP RATING: 500.0 FAHRENHEIT DEGF
•
MATERIAL: STEEL NUT
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATIONGRUMMAN A10 AIRCRAFT
FASTENING DEVICE TYPESELF-LOCKING HEXAGON NUT
STYLE DESIGNATORBAND
SURFACE TREATMENTCADMIUM NUT
TEMP RATING500.0 FAHRENHEIT DEGF
MATERIALSTEEL NUT
OVERALL WIDTH0.655 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM BOLT
SURFACE TREATMENTPASSIVATE BAND
MATERIALSTEEL CORROSION RESISTING BAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
U80-28Interchangeable
Same NIIN cross-reference
interchangeable
RM76Interchangeable
Same NIIN cross-reference
interchangeable
IPD5H4450Interchangeable
Same NIIN cross-reference
interchangeable
MIL-DTL-8783/1Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21920-28?
MS21920-28 is a CLAMP,HOSE.
What parts can replace MS21920-28?
There are 4 known substitutes for MS21920-28: U80-28, RM76, IPD5H4450 and 1 more. Substitute compatibility should be verified for your specific system.
Is MS21920-28 still available?
MS21920-28 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