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6566-40-921-0101 — CROSS,TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

6566-40-921-0101: CROSS,TUBE.

The CROSS,TUBE is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY OVERALL, leg_length: 1.726 INCHES MINIMUM AND 1.758 INCHES MAXIMUM FIRST END IN, seat_angle: 12.0 DEGREES ALL ENDS, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDS, connection_style: FLARELESS (TUBE) ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-162-5108, 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
6566-40-921-0101
NSN: 4730-01-162-5108
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 78286 — SIKORSKY AIRCRAFT CORPORATION DBA SIKORSKY AIRCRAFT CORP (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
leg_length1.726 INCHES MINIMUM AND 1.758 INCHES MAXIMUM FIRST END IN
seat_angle12.0 DEGREES ALL ENDS
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleFLARELESS (TUBE) ALL ENDS
special_featuresW/BULKHEAD ON 4TH END PER MS33515S12
nominal_thread_size1.062 INCHES THIRD END IN
thread_quantity_per_inch12 ALL ENDS
thread_series_designatorUNF ALL ENDS
material_document_and_classificationQQ-A-225/9 FED SPEC SINGLE MATERIAL RESPONSE AND QQ-250/12 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
nominal_outside_diameter_tube_accommodated0.625 INCHES SECOND END IN
NSN4730-01-162-5108
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 6566-40-921-0101 · 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
•
CONNECTION STYLE: FLARELESS (TUBE) ALL ENDS
•
CONNECTION TYPE: THREADED EXTERNAL TUBE ALL ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/9 FED SPEC SINGLE MATERIAL RESPONSE AND QQ-250/12 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.750 INCHES FOURTH END IN
•
LEG LENGTH: 1.663 INCHES MINIMUM AND 1.695 INCHES MAXIMUM SECOND END IN
TECHNICAL CHARACTERISTICS
CONNECTION STYLEFLARELESS (TUBE) ALL ENDS
CONNECTION TYPETHREADED EXTERNAL TUBE ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/9 FED SPEC SINGLE MATERIAL RESPONSE AND QQ-250/12 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.750 INCHES FOURTH END IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.625 INCHES SECOND END IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED1.000 INCHES FIRST END IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.750 INCHES THIRD END IN
LEG LENGTH1.663 INCHES MINIMUM AND 1.695 INCHES MAXIMUM SECOND END IN
LEG LENGTH1.726 INCHES MINIMUM AND 1.758 INCHES MAXIMUM FIRST END IN
LEG LENGTH1.726 INCHES MINIMUM AND 1.758 INCHES MAXIMUM FOURTH END IN
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 1
65664-09210Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6566-40-921-0101?
6566-40-921-0101 is a CROSS,TUBE.
What parts can replace 6566-40-921-0101?
There is 1 known substitute for 6566-40-921-0101: 65664-09210. Substitute compatibility should be verified for your specific system.
What is the NSN for 6566-40-921-0101?
6566-40-921-0101 is cataloged in the U.S. Government catalog under NSN 4730-01-162-5108. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.