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98HM1538-1 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

98HM1538-1: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, flange_diameter: 0.935 INCHES NOMINAL IN, hardness_rating: 58.0 ROCKWELL C MINIMUM AND 64.0 ROCKWELL C MAXIMUM BODY, style_designator: PLAIN FLANGED, surface_treatment: PASSIVATE OVERALL, body_inside_diameter: 0.563 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-028-1219, 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
98HM1538-1
NSN: 4820-00-028-1219
FSC: 4820 — Valves, Nonpowered
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
flange_diameter0.935 INCHES NOMINAL IN
hardness_rating58.0 ROCKWELL C MINIMUM AND 64.0 ROCKWELL C MAXIMUM BODY
style_designatorPLAIN FLANGED
surface_treatmentPASSIVATE OVERALL
body_inside_diameter0.563 INCHES NOMINAL IN
fsc_application_dataVALVE,AIRCRAFT HYDRAULIC SYSTEM
body_outside_diameter0.759 INCHES NOMINAL IN
seating_surface_shapeFLAT
flange_seat_to_disk_end_height0.062 INCHES NOMINAL IN
material_document_and_classificationQQ-764 TYPE 416 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4820-00-028-1219
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 98HM1538-1 · 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: 0.062 INCHES NOMINAL IN
•
FLANGE DIAMETER: 0.935 INCHES NOMINAL IN
•
FSC APPLICATION DATA: VALVE,AIRCRAFT HYDRAULIC SYSTEM
•
BODY OUTSIDE DIAMETER: 0.759 INCHES NOMINAL IN
•
HARDNESS RATING: 58.0 ROCKWELL C MINIMUM AND 64.0 ROCKWELL C MAXIMUM BODY
•
STYLE DESIGNATOR: PLAIN FLANGED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-764 TYPE 416 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
BODY INSIDE DIAMETER: 0.563 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.062 INCHES NOMINAL IN
FLANGE DIAMETER0.935 INCHES NOMINAL IN
FSC APPLICATION DATAVALVE,AIRCRAFT HYDRAULIC SYSTEM
BODY OUTSIDE DIAMETER0.759 INCHES NOMINAL IN
HARDNESS RATING58.0 ROCKWELL C MINIMUM AND 64.0 ROCKWELL C MAXIMUM BODY
STYLE DESIGNATORPLAIN FLANGED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-764 TYPE 416 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
BODY INSIDE DIAMETER0.563 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL 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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 98HM1538-1?
98HM1538-1 is a SEAT,VALVE.
What is the NSN for 98HM1538-1?
98HM1538-1 is cataloged in the U.S. Government catalog under NSN 4820-00-028-1219. 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.