PartsTable
Technical Data Sheet
PartsTable / COMPONENT / FF-6400-6-4
FF-6400-6-4 ✓ 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

ADAPTER,STRAIGHT,FLANGE TO PIPE. Key specifications include material: STEEL OVERALL, special_features: FIRST END IS FLAT FACE-.688-16 ORS MALE W/O-RING. SECOND END IS 0.438-20 ORB MALE, end_item_identification: 3990-01-443-8024; DUMP BODY, DEMOU, XM6, part_name_assigned_by_controlling_agency: ADAPTER 7/16 ORBM X 11/16 ORSM.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-538-1645, 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
FF-6400-6-4
NSN: 4730-01-538-1645
FSC: 4730
CAGE: 0S1H5 — TOMPKINS INDUSTRIES INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
special_featuresFIRST END IS FLAT FACE-.688-16 ORS MALE W/O-RING. SECOND END IS 0.438-20 ORB MALE
end_item_identification3990-01-443-8024; DUMP BODY, DEMOU, XM6
part_name_assigned_by_controlling_agencyADAPTER 7/16 ORBM X 11/16 ORSM
NSN4730-01-538-1645
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: FF-6400-6-4 · 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
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
SPECIAL FEATURESFIRST END IS FLAT FACE-.688-16 ORS MALE W/O-RING. SECOND END IS 0.438-20 ORB MALE
END ITEM IDENTIFICATION3990-01-443-8024; DUMP BODY, DEMOU, XM6
PART NAME ASSIGNED BY CONTROLLING AGENCYADAPTER 7/16 ORBM X 11/16 ORSM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
405921Interchangeable
interchangeable cross-reference
interchangeable
20206-1Interchangeable
interchangeable cross-reference
interchangeable
FR51127Interchangeable
interchangeable cross-reference
interchangeable
115666-0001Interchangeable
interchangeable cross-reference
interchangeable
51057-0027Interchangeable
interchangeable cross-reference
interchangeable
S-405921Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FF-6400-6-4?
FF-6400-6-4 is a ADAPTER,STRAIGHT,FLANGE TO PIPE.
What parts can replace FF-6400-6-4?
There are 6 known substitutes for FF-6400-6-4: 405921, 20206-1, FR51127 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FF-6400-6-4?
FF-6400-6-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-538-1645. 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