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Technical Data Sheet
PartsTable / COMPONENT / B-400-6
B-400-6 ✓ 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 NIPPLE,TUBE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, seat_angle: 20.0 DEGREES ALL ENDS, thread_class: 2A ALL ENDS A, connection_style: FLARELESS (TUBE) ALL ENDS, style_designator: FLARELESS W/ CENTER WRENCHING FACILITY, nominal_thread_size: 0.438 INCHES ALL ENDS IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-061-0389, 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
B-400-6
NSN: 4730-00-061-0389
FSC: 4730
CAGE: 3T9T9 — SWAGELOK CO (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
seat_angle20.0 DEGREES ALL ENDS
thread_class2A ALL ENDS A
connection_styleFLARELESS (TUBE) ALL ENDS
style_designatorFLARELESS W/ CENTER WRENCHING FACILITY
nominal_thread_size0.438 INCHES ALL ENDS IN
nominal_overall_length1.609 INCHES IN
thread_series_designatorUNF ALL ENDS
furnished_items_and_quantity2 TUBE COUPLING NUT
nominal_outside_diameter_tube_accommodated0.250 INCHES ALL ENDS IN
NSN4730-00-061-0389
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: B-400-6 · 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 OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES ALL ENDS IN
•
THREAD SERIES DESIGNATOR: UNF ALL ENDS
•
SEAT ANGLE: 20.0 DEGREES ALL ENDS
•
MATERIAL: COPPER ALLOY OVERALL
•
NOMINAL OVERALL LENGTH: 1.609 INCHES IN
•
STYLE DESIGNATOR: FLARELESS W/ CENTER WRENCHING FACILITY
•
FURNISHED ITEMS AND QUANTITY: 2 TUBE COUPLING NUT
•
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES ALL ENDS IN
THREAD SERIES DESIGNATORUNF ALL ENDS
SEAT ANGLE20.0 DEGREES ALL ENDS
MATERIALCOPPER ALLOY OVERALL
NOMINAL OVERALL LENGTH1.609 INCHES IN
STYLE DESIGNATORFLARELESS W/ CENTER WRENCHING FACILITY
FURNISHED ITEMS AND QUANTITY2 TUBE COUPLING NUT
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
THREAD CLASS2A ALL ENDS A
CONNECTION STYLEFLARELESS (TUBE) ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
CD4Interchangeable
interchangeable cross-reference
interchangeable
4SC4Interchangeable
interchangeable cross-reference
interchangeable
4UInterchangeable
interchangeable cross-reference
interchangeable
762FBInterchangeable
interchangeable cross-reference
interchangeable
762FB1-4Interchangeable
Same NIIN cross-reference
interchangeable
B55125-004Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B-400-6?
B-400-6 is a NIPPLE,TUBE.
What parts can replace B-400-6?
There are 8 known substitutes for B-400-6: CD4, 4SC4, 4U and 5 more. Substitute compatibility should be verified for your specific system.
Is B-400-6 still available?
B-400-6 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026