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RBC257B — DISK,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

RBC257B: DISK,VALVE.

The DISK,VALVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, seat_angle: 45.0 DEGREES NOMINAL, thread_class: 2B, overall_height: 1.438 INCHES NOMINAL IN, outside_diameter: 1.188 INCHES NOMINAL IN, style_designator: PLUG. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-362-6547, 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
RBC257B
NSN: 4820-00-362-6547
FSC: 4820 — Valves, Nonpowered
CAGE: 7PZX0 — FAIRBANKS MORSE, LLC (USA)
SPECIFICATIONS
materialCOPPER ALLOY
seat_angle45.0 DEGREES NOMINAL
thread_class2B
overall_height1.438 INCHES NOMINAL IN
outside_diameter1.188 INCHES NOMINAL IN
style_designatorPLUG
nominal_thread_size0.250 INCHES IN
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN4820-00-362-6547
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: RBC257B · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
OUTSIDE DIAMETER: 1.188 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLUG
•
SEAT ANGLE: 45.0 DEGREES NOMINAL
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
THREAD CLASS: 2B
•
MATERIAL: COPPER ALLOY
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT1.438 INCHES NOMINAL IN
OUTSIDE DIAMETER1.188 INCHES NOMINAL IN
STYLE DESIGNATORPLUG
SEAT ANGLE45.0 DEGREES NOMINAL
NOMINAL THREAD SIZE0.250 INCHES IN
THREAD CLASS2B
MATERIALCOPPER ALLOY
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
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 RBC257B?
RBC257B is a DISK,VALVE.
What is the NSN for RBC257B?
RBC257B is cataloged in the U.S. Government catalog under NSN 4820-00-362-6547. 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.