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Technical Data Sheet
PartsTable / COMPONENT / 3780 20
3780 20 ✓ 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 PLUG,TUBE FITTING,THREADED is a the manufacturer industrial component. Key specifications include material: STEEL ALLOY OVERALL, point_type: SPLIT, point_angle: 135.0 DEGREES NOMINAL, shank_style: STRAIGHT ROUND, flute_length: 1.062 INCHES NOMINAL IN, overall_length: 3.250 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-729-6400, 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
3780 20
NSN: 4730-00-729-6400
FSC: 4730
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL ALLOY OVERALL
point_typeSPLIT
point_angle135.0 DEGREES NOMINAL
shank_styleSTRAIGHT ROUND
flute_length1.062 INCHES NOMINAL IN
flute_quantity2
overall_length3.250 INCHES NOMINAL IN
shank_diameter0.161 INCHES NOMINAL IN
special_featuresJOBBERS LG; SCREW MACHINE FLUTE LG; WIRE SIZE 20
cutting_end_styleGENERAL PURPOSE
nominal_cutting_diameter0.1610 INCHES IN
cutting_rotation_directionRIGHT-HAND
NSN4730-00-729-6400
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3780 20 · 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
•
HEAD HEIGHT: 0.219 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLUG, TUBE FITTING FLARED (NOTE: DRILLED HOLE IS OPTIONAL, SHOULD NOT BE CONSIDERED AS A SEPARATING CHARACTERISTIC)
•
SEAT ANGLE: 37.0 DEGREES
•
CONNECTION STYLE: FLARED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5640 ASSN STD 1ST MATERIAL RESPONSE OR 66 FED STD 1ST MATERIAL RESPONSE OR AMS 5640 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5640 ASSN STD 3RD MATERIAL RESPONSE OVERALL
•
THREAD SERIES DESIGNATOR: UNF EXTERNAL
•
NOMINAL THREAD SIZE: 0.438 INCHES EXTERNAL IN
TECHNICAL CHARACTERISTICS (FLIS)
HEAD HEIGHT0.219 INCHES NOMINAL IN
STYLE DESIGNATORPLUG, TUBE FITTING FLARED (NOTE: DRILLED HOLE IS OPTIONAL, SHOULD NOT BE CONSIDERED AS A SEPARATING CHARACTERISTIC)
OVERALL LENGTH0.769 INCHES NOMINAL IN
SEAT ANGLE37.0 DEGREES
CONNECTION STYLEFLARED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5640 ASSN STD 1ST MATERIAL RESPONSE OR 66 FED STD 1ST MATERIAL RESPONSE OR AMS 5640 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5640 ASSN STD 3RD MATERIAL RESPONSE OVERALL
THREAD SERIES DESIGNATORUNF EXTERNAL
NOMINAL THREAD SIZE0.438 INCHES EXTERNAL IN
THREAD DIRECTIONRIGHT-HAND EXTERNAL
MATERIALSTEEL COMP 303 OR STEEL COMP 303SE OR STEEL CORROSION RESISTING OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
NAS907 TYDInterchangeable
interchangeable cross-reference
interchangeable
3780 20Interchangeable
interchangeable cross-reference
interchangeable
NAS907Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3780 20?
3780 20 is a PLUG,TUBE FITTING,THREADED.
What parts can replace 3780 20?
There are 3 known substitutes for 3780 20: NAS907 TYD, 3780 20, NAS907. Substitute compatibility should be verified for your specific system.
What is the NSN for 3780 20?
3780 20 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-729-6400. 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