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Technical Data Sheet
3018931 ✓ 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 ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING BODY, bonnet_type: INSIDE SCREW, thread_class: 3B ALL ENDS, connection_type: THREADED INTERNAL BOSS ALL ENDS, connection_style: GASKET SEAL(BOSS) ALL ENDS, special_features: WEAPON SYSTEM ESSENTIAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-181-8823, 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
3018931
NSN: 4730-00-181-8823
FSC: 4730
CAGE: 00198 — PRATT & WHITNEY CANADA CORP DIV PRATT & WHITNEY CANADA CORP. (CAN)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING BODY
bonnet_typeINSIDE SCREW
thread_class3B ALL ENDS
connection_typeTHREADED INTERNAL BOSS ALL ENDS
connection_styleGASKET SEAL(BOSS) ALL ENDS
special_featuresWEAPON SYSTEM ESSENTIAL
style_designatorSTRAIGHT THRU
thread_directionRIGHT-HAND ALL ENDS
features_providedBONNET PACKING
mounting_facilityBULKHEAD
operating_pressure5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
flow_control_deviceSTEM
NSN4730-00-181-8823
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3018931 · 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 THREAD SIZE: 0.750 INCHES SECOND END IN
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES FIRST END IN
MATERIAL: STEEL COMP 347 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5646 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.750 INCHES SECOND END IN
END ITEM IDENTIFICATIONAIRCRAFT APPLICATION
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES FIRST END IN
MATERIALSTEEL COMP 347 OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES FIRST END IN
NOMINAL THREAD SIZE0.750 INCHES SECOND END IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5646 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SEAT ANGLE37.0 DEGREES FIRST END
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5646 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
949B9BB9Interchangeable
interchangeable cross-reference
interchangeable
949B9BBPInterchangeable
interchangeable cross-reference
interchangeable
322AS143-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3018931?
3018931 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace 3018931?
There are 3 known substitutes for 3018931: 949B9BB9, 949B9BBP, 322AS143-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 3018931?
3018931 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-181-8823. This indicates validated use in U.S. government and defense supply chains.
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