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PartsTable / COMPONENT / MS21918-8
MS21918-8 ✓ 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 SLEEVE,CLINCH,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1213 OR STEEL COMP 630, flange_width: 0.060 INCHES NOMINAL IN, overall_length: 0.750 INCHES NOMINAL IN, special_features: WEAPON SYSTEM ESSENTIAL, style_designator: FLARELESS, seat_angle_in_deg: 35.0. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-203-6945, 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
MS21918-8
NSN: 4730-00-203-6945
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 1213 OR STEEL COMP 630
flange_width0.060 INCHES NOMINAL IN
overall_length0.750 INCHES NOMINAL IN
special_featuresWEAPON SYSTEM ESSENTIAL
style_designatorFLARELESS
seat_angle_in_deg35.0
surface_treatmentCADMIUM AND CHROMATE OR PASSIVATE
casehardening_indicatorCASEHARDENED
end_item_identificationC-141 AIRCRAFT AND CH-47 HELICOPTER
flange_outside_diameter0.625 INCHES NOMINAL IN
sleeve_outside_diameter0.585 INCHES NOMINAL IN
criticality_code_justificationFEAT
NSN4730-00-203-6945
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS21918-8 · 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
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.500 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 40.0
•
SLEEVE OUTSIDE DIAMETER: 0.585 INCHES MINIMUM AND 0.589 INCHES MAXIMUM IN
•
FLANGE OUTSIDE DIAMETER: 0.625 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLARELESS
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS (FLIS)
CASEHARDENING INDICATORNOT CASEHARDENED
OVERALL LENGTH0.372 INCHES MINIMUM AND 0.378 INCHES MAXIMUM IN
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.500 INCHES NOMINAL IN
SEAT ANGLE IN DEG40.0
SLEEVE OUTSIDE DIAMETER0.585 INCHES MINIMUM AND 0.589 INCHES MAXIMUM IN
FLANGE OUTSIDE DIAMETER0.625 INCHES NOMINAL IN
STYLE DESIGNATORFLARELESS
MATERIALSTEEL
SURFACE TREATMENTCADMIUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
MS21922-8Interchangeable
interchangeable cross-reference
interchangeable
AS21922-8Interchangeable
interchangeable cross-reference
interchangeable
AS81280Interchangeable
interchangeable cross-reference
interchangeable
ER819-8Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS21918-8?
MS21918-8 is a SLEEVE,CLINCH,TUBE FITTING.
What parts can replace MS21918-8?
There are 4 known substitutes for MS21918-8: MS21922-8, AS21922-8, AS81280 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS21918-8?
MS21918-8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-203-6945. 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