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H2256 — SEAT,VALVE

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

H2256: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, end_style: SPRING END,SQUARED AND GROUND BOTH ENDS, bore_diameter: 2.156 INCHES NOMINAL IN, coil_quantity: 8-3/10, inside_diameter: 1.599 INCHES NOMINAL IN, style_designator: CYLINDRICAL. This part is cataloged in the U.S.

Government catalog under NSN 5360-00-783-5607, 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
H2256
NSN: 5360-00-783-5607
NIINs: 007835607, 011455551
FSC: 5360 — Coil, Flat, Leaf, and Wire Springs
CAGE: 16712 — SIEMENS ENERGY, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
end_styleSPRING END,SQUARED AND GROUND BOTH ENDS
bore_diameter2.156 INCHES NOMINAL IN
coil_quantity8-3/10
inside_diameter1.599 INCHES NOMINAL IN
style_designatorCYLINDRICAL
surface_treatmentCADMIUM OVERALL
spring_free_length4.500 INCHES NOMINAL IN
spring_solid_length2.155 INCHES NOMINAL IN
coil_helix_directionRIGHT-HAND OR LEFT-HAND
spring_deflection_rate170.000 POUNDS PER INCH NOMINAL LBS
accommodated_rod_diameter1.562 INCHES NOMINAL IN
NSN5360-00-783-5607
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SEAT,VALVE TITLE COMPONENT PN H2256 MFR SEAT,VALVE
KEY FEATURES
•
SPRING FREE OUTSIDE DIAMETER: 2.125 INCHES NOMINAL IN
•
END STYLE: SPRING END,SQUARED AND GROUND BOTH ENDS
•
SPRING SOLID LENGTH: 2.155 INCHES NOMINAL IN
•
ACCOMMODATED ROD DIAMETER: 1.562 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CYLINDRICAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6715,TYPE 1,CLASS A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SPRING FREE LENGTH: 4.500 INCHES NOMINAL IN
•
SPRING DEFLECTION RATE: 170.000 POUNDS PER INCH NOMINAL LBS
TECHNICAL CHARACTERISTICS
SPRING FREE OUTSIDE DIAMETER2.125 INCHES NOMINAL IN
END STYLESPRING END,SQUARED AND GROUND BOTH ENDS
SPRING SOLID LENGTH2.155 INCHES NOMINAL IN
ACCOMMODATED ROD DIAMETER1.562 INCHES NOMINAL IN
STYLE DESIGNATORCYLINDRICAL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6715,TYPE 1,CLASS A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
SPRING FREE LENGTH4.500 INCHES NOMINAL IN
SPRING DEFLECTION RATE170.000 POUNDS PER INCH NOMINAL LBS
INSIDE DIAMETER1.599 INCHES NOMINAL IN
SPRING SOLID OUTSIDE DIAMETER2.625 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
M-258MZReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 H2256?
H2256 is a SEAT,VALVE.
What parts can replace H2256?
There is 1 known substitute for H2256: M-258MZ. Substitute compatibility should be verified for your specific system.
What is the NSN for H2256?
H2256 is cataloged in the U.S. Government catalog under NSN 5360-00-783-5607. 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.