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B577 — B577

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

B577: B577.

The B577 is a the manufacturer industrial component. Key specifications include height: 2.250 INCHES NOMINAL IN, material: COPPER ALLOY OVERALL, grease_capacity: 0.500 OUNCES OZ, style_designator: STRAIGHT, CAP FEED, W/BALL CHECK, nominal_thread_size: 0.125 INCHES IN, assembly_clearance_radius: 0.625 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-734-0106, 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
MRO→ MRO_GENERAL→ B577
NSN: 4730-00-734-0106
NIINs: 007340106, 014926594
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 64104 — DRESSER, LLC (USA)
SPECIFICATIONS
height2.250 INCHES NOMINAL IN
materialCOPPER ALLOY OVERALL
grease_capacity0.500 OUNCES OZ
style_designatorSTRAIGHT, CAP FEED, W/BALL CHECK
nominal_thread_size0.125 INCHES IN
assembly_clearance_radius0.625 INCHES MAXIMUM IN
screw_thread_series_designatorNPT
NSN4730-00-734-0106
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: B577 · 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
•
ASSEMBLY CLEARANCE RADIUS: 0.625 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: STRAIGHT, CAP FEED, W/BALL CHECK
•
NOMINAL THREAD SIZE: 0.125 INCHES IN
•
HEIGHT: 2.250 INCHES NOMINAL IN
•
SCREW THREAD SERIES DESIGNATOR: NPT
•
GREASE CAPACITY: 0.500 OUNCES OZ
•
MATERIAL: COPPER ALLOY OVERALL
TECHNICAL CHARACTERISTICS
ASSEMBLY CLEARANCE RADIUS0.625 INCHES MAXIMUM IN
STYLE DESIGNATORSTRAIGHT, CAP FEED, W/BALL CHECK
NOMINAL THREAD SIZE0.125 INCHES IN
HEIGHT2.250 INCHES NOMINAL IN
SCREW THREAD SERIES DESIGNATORNPT
GREASE CAPACITY0.500 OUNCES OZ
MATERIALCOPPER ALLOY OVERALL
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B577?
B577 is a B577. It is classified as a MRO (MRO_GENERAL).
What is the NSN for B577?
B577 is cataloged in the U.S. Government catalog under NSN 4730-00-734-0106. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.