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6859371 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

6859371: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, seat_radius: 0.030 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN, flange_diameter: 1.122 INCHES MINIMUM AND 1.123 INCHES MAXIMUM IN, hardness_rating: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OVERALL, style_designator: PLAIN FLANGED, under_flange_height: 0.165 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-104-6770, 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
6859371
NSN: 4820-01-104-6770
FSC: 4820 — Valves, Nonpowered
CAGE: 63005 — ROLLS-ROYCE CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
seat_radius0.030 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN
flange_diameter1.122 INCHES MINIMUM AND 1.123 INCHES MAXIMUM IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OVERALL
style_designatorPLAIN FLANGED
under_flange_height0.165 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
body_outside_diameter1.008 INCHES MINIMUM AND 1.012 INCHES MAXIMUM IN
seating_surface_shapeRADIAL
end_item_identificationT-56 ENGINE
body_stepped_inside_diameter0.920 INCHES NOMINAL SECOND STEP IN
flange_seat_to_disk_end_height0.259 INCHES NOMINAL IN
NSN4820-01-104-6770
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 6859371 · 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: 0.259 INCHES NOMINAL IN
•
FLANGE DIAMETER: 1.122 INCHES MINIMUM AND 1.123 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 1.008 INCHES MINIMUM AND 1.012 INCHES MAXIMUM IN
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OVERALL
•
BODY STEPPED INSIDE DIAMETER: 0.500 INCHES MINIMUM AND 0.505 INCHES MAXIMUM FIRST STEP IN
•
STYLE DESIGNATOR: PLAIN FLANGED
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.259 INCHES NOMINAL IN
FLANGE DIAMETER1.122 INCHES MINIMUM AND 1.123 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER1.008 INCHES MINIMUM AND 1.012 INCHES MAXIMUM IN
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OVERALL
BODY STEPPED INSIDE DIAMETER0.500 INCHES MINIMUM AND 0.505 INCHES MAXIMUM FIRST STEP IN
BODY STEPPED INSIDE DIAMETER0.920 INCHES NOMINAL SECOND STEP IN
BODY STEPPED INSIDE DIAMETER0.978 INCHES MINIMUM AND 0.983 INCHES MAXIMUM THIRD STEP IN
STYLE DESIGNATORPLAIN FLANGED
SEAT RADIUS0.030 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN
UNDER FLANGE HEIGHT0.165 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6859371?
6859371 is a SEAT,VALVE.
What is the NSN for 6859371?
6859371 is cataloged in the U.S. Government catalog under NSN 4820-01-104-6770. 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.