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51145-FP-183 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

51145-FP-183: 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: 0.210 INCHES NOMINAL SINGLE THREADED PORTION IN, overall_height: 0.472 INCHES NOMINAL IN, style_designator: PLAIN THREADED, nominal_thread_size: 1.438 INCHES SINGLE THREADED PORTION IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-115-7399, 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
51145-FP-183
NSN: 4820-01-115-7399
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_length0.210 INCHES NOMINAL SINGLE THREADED PORTION IN
overall_height0.472 INCHES NOMINAL IN
style_designatorPLAIN THREADED
nominal_thread_size1.438 INCHES SINGLE THREADED PORTION IN
body_inside_diameter0.965 INCHES NOMINAL IN
seating_surface_shapeFLAT
thread_quantity_per_inch20 SINGLE THREADED PORTION
thread_series_designatorUN SINGLE THREADED PORTION
material_document_and_classificationQQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4820-01-115-7399
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 51145-FP-183 · 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
•
THREAD LENGTH: 0.210 INCHES NOMINAL SINGLE THREADED PORTION IN
•
STYLE DESIGNATOR: PLAIN THREADED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
BODY INSIDE DIAMETER: 0.965 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 1.438 INCHES SINGLE THREADED PORTION IN
•
THREAD CLASS: 2A SINGLE THREADED PORTION A
•
THREAD QUANTITY PER INCH: 20 SINGLE THREADED PORTION
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.472 INCHES NOMINAL IN
THREAD LENGTH0.210 INCHES NOMINAL SINGLE THREADED PORTION IN
STYLE DESIGNATORPLAIN THREADED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
BODY INSIDE DIAMETER0.965 INCHES NOMINAL IN
NOMINAL THREAD SIZE1.438 INCHES SINGLE THREADED PORTION IN
THREAD CLASS2A SINGLE THREADED PORTION A
THREAD QUANTITY PER INCH20 SINGLE THREADED PORTION
MATERIALNICKEL ALLOY OVERALL
THREAD SERIES DESIGNATORUN 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 2
51145-FP-180Reference document
Same NSN cross-reference
Reference document — Secondary reference
51145-FReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 51145-FP-183?
51145-FP-183 is a SEAT,VALVE.
What parts can replace 51145-FP-183?
There are 2 known substitutes for 51145-FP-183: 51145-FP-180, 51145-F. Substitute compatibility should be verified for your specific system.
What is the NSN for 51145-FP-183?
51145-FP-183 is cataloged in the U.S. Government catalog under NSN 4820-01-115-7399. 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.