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51170E — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

51170E: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON OVERALL, thread_class: 3A SINGLE THREADED PORTION A, thread_length: 0.328 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 1.281 INCHES MINIMUM AND 1.291 INCHES MAXIMUM IN, style_designator: THREADED FLANGED, seat_angle_in_deg: 45.000 NOMINAL. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-412-3610, 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
51170E
NSN: 4820-00-412-3610
FSC: 4820 — Valves, Nonpowered
CAGE: 76364 — MILWAUKEE VALVE CO, INC DIV MILWAUKEE VALVE COMPANY, LLC (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON OVERALL
thread_class3A SINGLE THREADED PORTION A
thread_length0.328 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter1.281 INCHES MINIMUM AND 1.291 INCHES MAXIMUM IN
style_designatorTHREADED FLANGED
seat_angle_in_deg45.000 NOMINAL
nominal_thread_size1.125 INCHES SINGLE THREADED PORTION IN
under_flange_height0.406 INCHES NOMINAL IN
body_inside_diameter0.810 INCHES MINIMUM AND 0.814 INCHES MAXIMUM IN
seating_surface_shapeANGULAR
thread_quantity_per_inch20 SINGLE THREADED PORTION
thread_series_designatorUN SINGLE THREADED PORTION
NSN4820-00-412-3610
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 51170E · 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 DIAMETER: 1.281 INCHES MINIMUM AND 1.291 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.328 INCHES NOMINAL SINGLE THREADED PORTION IN
•
STYLE DESIGNATOR: THREADED FLANGED
•
BODY INSIDE DIAMETER: 0.810 INCHES MINIMUM AND 0.814 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 1.125 INCHES SINGLE THREADED PORTION IN
•
UNDER FLANGE HEIGHT: 0.406 INCHES NOMINAL IN
•
THREAD CLASS: 3A SINGLE THREADED PORTION A
•
THREAD QUANTITY PER INCH: 20 SINGLE THREADED PORTION
TECHNICAL CHARACTERISTICS
FLANGE DIAMETER1.281 INCHES MINIMUM AND 1.291 INCHES MAXIMUM IN
THREAD LENGTH0.328 INCHES NOMINAL SINGLE THREADED PORTION IN
STYLE DESIGNATORTHREADED FLANGED
BODY INSIDE DIAMETER0.810 INCHES MINIMUM AND 0.814 INCHES MAXIMUM IN
NOMINAL THREAD SIZE1.125 INCHES SINGLE THREADED PORTION IN
UNDER FLANGE HEIGHT0.406 INCHES NOMINAL IN
THREAD CLASS3A SINGLE THREADED PORTION A
THREAD QUANTITY PER INCH20 SINGLE THREADED PORTION
MATERIALPLASTIC POLYAMIDE NYLON OVERALL
SEAT ANGLE IN DEG45.000 NOMINAL
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: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 51170E?
51170E is a SEAT,VALVE.
What is the NSN for 51170E?
51170E is cataloged in the U.S. Government catalog under NSN 4820-00-412-3610. 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.