PartsTable
Technical Data Sheet
Download PDF

1JC8956-6 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

1JC8956-6: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL BODY, seat_radius: 0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN, flange_diameter: 3.042 INCHES MINIMUM AND 3.052 INCHES MAXIMUM IN, style_designator: PLAIN FLANGED, under_flange_height: 0.938 INCHES NOMINAL IN, body_inside_diameter: 1.344 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-594-1998, 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
1JC8956-6
NSN: 4820-00-594-1998
FSC: 4820 — Valves, Nonpowered
CAGE: 90099 — NORTHROP GRUMMAN SYSTEMS CORPORATION DIV MARINE SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL BODY
seat_radius0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN
flange_diameter3.042 INCHES MINIMUM AND 3.052 INCHES MAXIMUM IN
style_designatorPLAIN FLANGED
under_flange_height0.938 INCHES NOMINAL IN
body_inside_diameter1.344 INCHES NOMINAL IN
taper_major_diameter1.344 INCHES NOMINAL IN
taper_minor_diameter0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM IN
body_outside_diameter2.562 INCHES MINIMUM AND 2.563 INCHES MAXIMUM IN
seating_surface_shapeRADIAL
seal_accommodation_typeGROOVED
flange_seat_to_disk_end_height1.245 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
NSN4820-00-594-1998
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 1JC8956-6 · 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: 1.245 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
•
FLANGE DIAMETER: 3.042 INCHES MINIMUM AND 3.052 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 2.562 INCHES MINIMUM AND 2.563 INCHES MAXIMUM IN
•
SEAL ACCOMMODATION TYPE: GROOVED
•
TAPER MINOR DIAMETER: 0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: PLAIN FLANGED
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-17131,TYPE MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE FACE
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT1.245 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
FLANGE DIAMETER3.042 INCHES MINIMUM AND 3.052 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER2.562 INCHES MINIMUM AND 2.563 INCHES MAXIMUM IN
SEAL ACCOMMODATION TYPEGROOVED
TAPER MINOR DIAMETER0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM IN
STYLE DESIGNATORPLAIN FLANGED
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-17131,TYPE MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE FACE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE BODY
TAPER MAJOR DIAMETER1.344 INCHES NOMINAL IN
BODY INSIDE DIAMETER1.344 INCHES NOMINAL 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 1
1JH4864PC43Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
Ready to buy 1JC8956-6?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 1JC8956-6?
1JC8956-6 is a SEAT,VALVE.
What parts can replace 1JC8956-6?
There is 1 known substitute for 1JC8956-6: 1JH4864PC43. Substitute compatibility should be verified for your specific system.
What is the NSN for 1JC8956-6?
1JC8956-6 is cataloged in the U.S. Government catalog under NSN 4820-00-594-1998. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 1JC8956-6

✓ 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.