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Technical Data Sheet
PartsTable / COMPONENT / NS4-4
NS4-4 ✓ 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

The BEARING,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, nut_style: TUBE COUPLING, nut_height: 0.590 INCHES NOMINAL IN, seat_angle: 43.0 DEGREES MINIMUM AND 45.0 DEGREES MAXIMUM, thread_class: 2B, thread_series: UNF. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-189-2737, 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
NS4-4
NSN: 4730-00-189-2737
FSC: 4730
CAGE: 41947 — MUELLER BRASS CO. (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleTUBE COUPLING
nut_height0.590 INCHES NOMINAL IN
seat_angle43.0 DEGREES MINIMUM AND 45.0 DEGREES MAXIMUM
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
fabrication_methodFORGED
length_to_shoulder0.440 INCHES NOMINAL IN
width_across_flats0.625 INCHES NOMINAL IN
nominal_thread_size0.438 INCHES IN
smallest_inside_diameter0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
NSN4730-00-189-2737
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: NS4-4 · 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
•
LENGTH TO SHOULDER: 0.440 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 20
•
SMALLEST INSIDE DIAMETER: 0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
•
NOMINAL TUBE OUTSIDE DIAMETER: 0.250 INCHES IN
•
WIDTH ACROSS FLATS: 0.625 INCHES NOMINAL IN
•
SPECIFICATION/STANDARD DATA: 81343-J513 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
NUT HEIGHT: 0.590 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
LENGTH TO SHOULDER0.440 INCHES NOMINAL IN
THREAD QUANTITY PER INCH20
SMALLEST INSIDE DIAMETER0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
NOMINAL TUBE OUTSIDE DIAMETER0.250 INCHES IN
WIDTH ACROSS FLATS0.625 INCHES NOMINAL IN
SPECIFICATION/STANDARD DATA81343-J513 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NUT HEIGHT0.590 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.438 INCHES IN
THREAD SERIESUNF
NUT STYLETUBE COUPLING
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
A5051Interchangeable
interchangeable cross-reference
interchangeable
A5-45-941Interchangeable
interchangeable cross-reference
interchangeable
GGG-W-641 TY3CL4STAInterchangeable
interchangeable cross-reference
interchangeable
E12315Interchangeable
interchangeable cross-reference
interchangeable
S1831Interchangeable
interchangeable cross-reference
interchangeable
D5050Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NS4-4?
NS4-4 is a BEARING,BALL,ANNULAR.
What parts can replace NS4-4?
There are 30 known substitutes for NS4-4: A5051, A5-45-941, GGG-W-641 TY3CL4STA and 27 more. Substitute compatibility should be verified for your specific system.
Is NS4-4 still available?
NS4-4 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