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D15856 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

D15856: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.375 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 1.781 INCHES NOMINAL IN, style_designator: THREADED FLANGED, seat_angle_in_deg: 42.000 NOMINAL. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-391-8249, 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
D15856
NSN: 4820-00-391-8249
FSC: 4820 — Valves, Nonpowered
CAGE: 23168 — HAMMEL DAHL INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class2A SINGLE THREADED PORTION A
thread_length0.375 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter1.781 INCHES NOMINAL IN
style_designatorTHREADED FLANGED
seat_angle_in_deg42.000 NOMINAL
nominal_thread_size1.562 INCHES SINGLE THREADED PORTION IN
under_flange_height0.375 INCHES NOMINAL IN
seating_surface_shapeANGULAR
thread_quantity_per_inch14 SINGLE THREADED PORTION
thread_series_designatorUNS SINGLE THREADED PORTION
body_stepped_inside_diameter1.000 INCHES MINIMUM AND 1.312 INCHES MAXIMUM FIRST STEP IN
NSN4820-00-391-8249
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: D15856 · 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: 0.438 INCHES NOMINAL IN
•
FLANGE DIAMETER: 1.781 INCHES NOMINAL IN
•
THREAD LENGTH: 0.375 INCHES NOMINAL SINGLE THREADED PORTION IN
•
BODY STEPPED INSIDE DIAMETER: 1.000 INCHES MINIMUM AND 1.312 INCHES MAXIMUM FIRST STEP IN
•
STYLE DESIGNATOR: THREADED FLANGED
•
NOMINAL THREAD SIZE: 1.562 INCHES SINGLE THREADED PORTION IN
•
UNDER FLANGE HEIGHT: 0.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.438 INCHES NOMINAL IN
FLANGE DIAMETER1.781 INCHES NOMINAL IN
THREAD LENGTH0.375 INCHES NOMINAL SINGLE THREADED PORTION IN
BODY STEPPED INSIDE DIAMETER1.000 INCHES MINIMUM AND 1.312 INCHES MAXIMUM FIRST STEP IN
BODY STEPPED INSIDE DIAMETER1.010 INCHES MINIMUM AND 1.120 INCHES MAXIMUM SECOND STEP IN
STYLE DESIGNATORTHREADED FLANGED
NOMINAL THREAD SIZE1.562 INCHES SINGLE THREADED PORTION IN
UNDER FLANGE HEIGHT0.375 INCHES NOMINAL IN
THREAD CLASS2A SINGLE THREADED PORTION A
THREAD QUANTITY PER INCH14 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 1
C50701-05 MEAReference document
Same NSN cross-reference
Reference document — Design control — primary reference
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 D15856?
D15856 is a SEAT,VALVE.
What parts can replace D15856?
There is 1 known substitute for D15856: C50701-05 MEA. Substitute compatibility should be verified for your specific system.
What is the NSN for D15856?
D15856 is cataloged in the U.S. Government catalog under NSN 4820-00-391-8249. 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.