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MC12944 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

MC12944: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, seat_radius: 0.188 INCHES NOMINAL IN, flange_diameter: 0.550 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN, hardness_rating: 82.0 ROCKWELL C MAXIMUM OVERALL, style_designator: PLAIN FLANGED, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-085-7071, 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
MC12944
NSN: 4820-01-085-7071
FSC: 4820 — Valves, Nonpowered
CAGE: 76050 — EATON AEROSPACE LLC DBA STERER ENGINEERING DIV M.C.AEROSPACE (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
seat_radius0.188 INCHES NOMINAL IN
flange_diameter0.550 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN
hardness_rating82.0 ROCKWELL C MAXIMUM OVERALL
style_designatorPLAIN FLANGED
surface_treatmentPASSIVATE OVERALL
under_flange_height0.418 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN
body_inside_diameter0.111 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
body_outside_diameter0.357 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
seating_surface_shapeRADIAL
flange_seat_to_disk_end_height0.101 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4820-01-085-7071
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: MC12944 · 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: 0.101 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN
•
FLANGE DIAMETER: 0.550 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MC+5 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
BODY OUTSIDE DIAMETER: 0.357 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
•
HARDNESS RATING: 82.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: PLAIN FLANGED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
BODY INSIDE DIAMETER: 0.111 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.101 INCHES MINIMUM AND 0.108 INCHES MAXIMUM IN
FLANGE DIAMETER0.550 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMC+5 MFR REF SINGLE TREATMENT RESPONSE OVERALL
BODY OUTSIDE DIAMETER0.357 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
HARDNESS RATING82.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORPLAIN FLANGED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
BODY INSIDE DIAMETER0.111 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
SEAT RADIUS0.188 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MC12944?
MC12944 is a SEAT,VALVE.
What is the NSN for MC12944?
MC12944 is cataloged in the U.S. Government catalog under NSN 4820-01-085-7071. 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.