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H3503 — HOUSING,LABYRINTH,STEAM TURBINE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

H3503: HOUSING,LABYRINTH,STEAM TURBINE.

HOUSING,LABYRINTH,STEAM TURBINE. Key specifications include material: STEEL, peripheral_shape_style: RECTANGLE, FOUR HOLES, material_document_and_classification: MIL-S-16782 MIL SPEC SINGLE MATERIAL RESPONSE, general_characteristics_item_description: BRONZE,MIL-B-16444,GR A. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-168-1890, 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
H3503
NSN: 5340-01-168-1890
NIINs: 011681890, 011681891, 011681892, 011682027, 011682029, 011682031, 011682032, 011682033, 011682034, 011682035, 011682036, 011697556, 011697681, 011697682, 011697683, 011697684
FSC: 5340 — Hardware, Commercial
CAGE: 16712 — SIEMENS ENERGY, INC. (USA)
SPECIFICATIONS
materialSTEEL
peripheral_shape_styleRECTANGLE, FOUR HOLES
material_document_and_classificationMIL-S-16782 MIL SPEC SINGLE MATERIAL RESPONSE
general_characteristics_item_descriptionBRONZE,MIL-B-16444,GR A
NSN5340-01-168-1890
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: H3503 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-16782 MIL SPEC SINGLE MATERIAL RESPONSE
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-16782 MIL SPEC SINGLE MATERIAL RESPONSE
MATERIALSTEEL
SUBSTITUTES & CROSS-REFERENCES 1
H-3503PIECE30Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is H3503?
H3503 is a HOUSING,LABYRINTH,STEAM TURBINE.
What parts can replace H3503?
There is 1 known substitute for H3503: H-3503PIECE30. Substitute compatibility should be verified for your specific system.
What is the NSN for H3503?
H3503 is cataloged in the U.S. Government catalog under NSN 5340-01-168-1890. 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.