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51157D — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

51157D: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.250 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 0.904 INCHES NOMINAL IN, special_features: TWO WRENCHING LUGS ON SEAT END, style_designator: THREADED FLANGED. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-130-8775, 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
51157D
NSN: 4820-01-130-8775
FSC: 4820 — Valves, Nonpowered
CAGE: 76364 — MILWAUKEE VALVE CO, INC DIV MILWAUKEE VALVE COMPANY, LLC (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
thread_class2A SINGLE THREADED PORTION A
thread_length0.250 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter0.904 INCHES NOMINAL IN
special_featuresTWO WRENCHING LUGS ON SEAT END
style_designatorTHREADED FLANGED
seat_angle_in_deg75.000 NOMINAL
nominal_thread_size0.750 INCHES SINGLE THREADED PORTION IN
under_flange_height0.312 INCHES NOMINAL IN
body_inside_diameter0.468 INCHES NOMINAL IN
seating_surface_shapeANGULAR
thread_quantity_per_inch24 SINGLE THREADED PORTION
NSN4820-01-130-8775
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 51157D · 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
•
FLANGE SEAT TO DISK END HEIGHT: 0.127 INCHES NOMINAL IN
•
FLANGE DIAMETER: 0.904 INCHES NOMINAL IN
•
THREAD LENGTH: 0.250 INCHES NOMINAL SINGLE THREADED PORTION IN
•
STYLE DESIGNATOR: THREADED FLANGED
•
BODY INSIDE DIAMETER: 0.468 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.750 INCHES SINGLE THREADED PORTION IN
•
UNDER FLANGE HEIGHT: 0.312 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.127 INCHES NOMINAL IN
FLANGE DIAMETER0.904 INCHES NOMINAL IN
THREAD LENGTH0.250 INCHES NOMINAL SINGLE THREADED PORTION IN
STYLE DESIGNATORTHREADED FLANGED
BODY INSIDE DIAMETER0.468 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.750 INCHES SINGLE THREADED PORTION IN
SPECIAL FEATURESTWO WRENCHING LUGS ON SEAT END
UNDER FLANGE HEIGHT0.312 INCHES NOMINAL IN
THREAD CLASS2A SINGLE THREADED PORTION A
THREAD QUANTITY PER INCH24 SINGLE THREADED PORTION
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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 51157D?
51157D is a SEAT,VALVE.
What is the NSN for 51157D?
51157D is cataloged in the U.S. Government catalog under NSN 4820-01-130-8775. 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.