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Technical Data Sheet
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4BU ✓ 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 CENTER BULKHEAD A, connection_style: FLARELESS (TUBE) ALL ENDS, style_designator: FLARELESS W/ OFFSET WRENCHING FACILITY, nominal_thread_size: 0.438 INCHES CENTER BULKHEAD IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-061-6912, 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
4BU
NSN: 4730-00-061-6912
FSC: 4730
CAGE: 28968 — CIRCOR INSTRUMENTATION TECHNOLOGIES, INC. DBA HOKE GYROLOK (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
seat_angle20.0 DEGREES ALL ENDS
thread_class2A CENTER BULKHEAD A
connection_styleFLARELESS (TUBE) ALL ENDS
style_designatorFLARELESS W/ OFFSET WRENCHING FACILITY
nominal_thread_size0.438 INCHES CENTER BULKHEAD IN
nominal_overall_length2.270 INCHES IN
thread_series_designatorUNF CENTER BULKHEAD
furnished_items_and_quantity4 FERRULE SLEEVE AND 2 TUBE COUPLING NUT AND 1 LOCKNUT
nominal_outside_diameter_tube_accommodated0.250 INCHES ALL ENDS IN
NSN4730-00-061-6912
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4BU · 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
•
THREAD SERIES DESIGNATOR: UNF ALL ENDS
•
MATERIAL: COPPER ALLOY OVERALL
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES ALL ENDS IN
•
NOMINAL OVERALL LENGTH: 2.270 INCHES IN
•
SEAT ANGLE: 20.0 DEGREES ALL ENDS
•
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
•
FURNISHED ITEMS AND QUANTITY: 4 FERRULE SLEEVE AND 2 TUBE COUPLING NUT AND 1 LOCKNUT
•
STYLE DESIGNATOR: FLARELESS W/ OFFSET WRENCHING FACILITY
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNF ALL ENDS
MATERIALCOPPER ALLOY OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES ALL ENDS IN
NOMINAL OVERALL LENGTH2.270 INCHES IN
SEAT ANGLE20.0 DEGREES ALL ENDS
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
FURNISHED ITEMS AND QUANTITY4 FERRULE SLEEVE AND 2 TUBE COUPLING NUT AND 1 LOCKNUT
STYLE DESIGNATORFLARELESS W/ OFFSET WRENCHING FACILITY
NOMINAL THREAD SIZE0.438 INCHES CENTER BULKHEAD IN
CONNECTION STYLEFLARELESS (TUBE) ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
3614ANG25Interchangeable
interchangeable cross-reference
interchangeable
AA-3614Interchangeable
interchangeable cross-reference
interchangeable
3614MILG3278AInterchangeable
interchangeable cross-reference
interchangeable
583RH-3/16-3/8SInterchangeable
interchangeable cross-reference
interchangeable
JF-6Interchangeable
interchangeable cross-reference
interchangeable
56801Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4BU?
4BU is a NIPPLE,TUBE.
What parts can replace 4BU?
There are 22 known substitutes for 4BU: 3614ANG25, AA-3614, 3614MILG3278A and 19 more. Substitute compatibility should be verified for your specific system.
Is 4BU still available?
4BU 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