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Technical Data Sheet
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3AS21906 — CROSS,TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

3AS21906: CROSS,TUBE.

The CROSS,TUBE is a the manufacturer industrial component. Key specifications include leg_length: 1.406 INCHES MINIMUM AND 1.453 INCHES MAXIMUM ALL ENDS IN, thread_class: 3A ALL ENDS A, style_designator: BEVELED BOTH ENDS, nominal_thread_size: 0.875 INCHES ALL ENDS IN, thread_quantity_per_inch: 14 ALL ENDS, thread_series_designator: UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-560-6484, 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
3AS21906
NSN: 4730-01-560-6484
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 20950 — ESPEY MFG AND ELECTRONICS CORP (USA)
SPECIFICATIONS
leg_length1.406 INCHES MINIMUM AND 1.453 INCHES MAXIMUM ALL ENDS IN
thread_class3A ALL ENDS A
style_designatorBEVELED BOTH ENDS
nominal_thread_size0.875 INCHES ALL ENDS IN
thread_quantity_per_inch14 ALL ENDS
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
nominal_pipe_size_accommodated0.625 INCHES ALL ENDS IN
part_name_assigned_by_controlling_agencyCROSS,FLARELESS TUBE
NSN4730-01-560-6484
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3AS21906 · 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
•
NOMINAL PIPE SIZE ACCOMMODATED: 0.625 INCHES ALL ENDS IN
•
STYLE DESIGNATOR: BEVELED BOTH ENDS
•
LEG LENGTH: 1.406 INCHES MINIMUM AND 1.453 INCHES MAXIMUM ALL ENDS IN
•
NOMINAL THREAD SIZE: 0.875 INCHES ALL ENDS IN
•
THREAD CLASS: 3A ALL ENDS A
•
THREAD QUANTITY PER INCH: 14 ALL ENDS
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
TECHNICAL CHARACTERISTICS
NOMINAL PIPE SIZE ACCOMMODATED0.625 INCHES ALL ENDS IN
STYLE DESIGNATORBEVELED BOTH ENDS
LEG LENGTH1.406 INCHES MINIMUM AND 1.453 INCHES MAXIMUM ALL ENDS IN
NOMINAL THREAD SIZE0.875 INCHES ALL ENDS IN
PART NAME ASSIGNED BY CONTROLLING AGENCYCROSS,FLARELESS TUBE
THREAD CLASS3A ALL ENDS A
THREAD QUANTITY PER INCH14 ALL ENDS
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
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
MS21906J10Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3AS21906?
3AS21906 is a CROSS,TUBE.
What parts can replace 3AS21906?
There is 1 known substitute for 3AS21906: MS21906J10. Substitute compatibility should be verified for your specific system.
What is the NSN for 3AS21906?
3AS21906 is cataloged in the U.S. Government catalog under NSN 4730-01-560-6484. This indicates validated use in U.S. government and defense supply chains.
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