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5497637-1 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

5497637-1: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: STEEL, design_type: THREADED, thread_class: 3B, overall_diameter: 3.250 INCHES NOMINAL IN, special_features: HAS SQUARE TOP; HAS ONE HOLE 0.279 IN. MIN AND 0.289 IN.

MAX DIA ON FLANGE END; HAS GROOVE FOR O-RING IN, surface_treatment: PAINT. This part is cataloged in the U.S. Government catalog under NSN 5340-01-297-6404, 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
5497637-1
NSN: 5340-01-297-6404
FSC: 5340 — Hardware, Commercial
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL
design_typeTHREADED
thread_class3B
overall_diameter3.250 INCHES NOMINAL IN
special_featuresHAS SQUARE TOP; HAS ONE HOLE 0.279 IN. MIN AND 0.289 IN. MAX DIA ON FLANGE END; HAS GROOVE FOR O-RING IN
surface_treatmentPAINT
inside_diameter_length1.312 INCHES NOMINAL IN
round_cap_outside_surface_conditionSMOOTH
material_document_and_classificationAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE
thread_size_and_series/type_designator1.500-6 UNIFIED NATIONAL COARSE (UNC)
tube_outside_diameter_for_which_designed1.500 INCHES NOMINAL IN
surface_treatment_document_and_classificationMIL-P-24441/2 MIL SPEC SINGLE TREATMENT RESPONSE
NSN5340-01-297-6404
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 5497637-1 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-P-24441/2 MIL SPEC SINGLE TREATMENT RESPONSE
•
DESIGN TYPE: THREADED
•
OVERALL DIAMETER: 3.250 INCHES NOMINAL IN
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 1.500 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE
•
SURFACE TREATMENT: PAINT
•
THREAD CLASS: 3B
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-P-24441/2 MIL SPEC SINGLE TREATMENT RESPONSE
DESIGN TYPETHREADED
OVERALL DIAMETER3.250 INCHES NOMINAL IN
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED1.500 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE
SPECIAL FEATURESHAS SQUARE TOP; HAS ONE HOLE 0.279 IN. MIN AND 0.289 IN. MAX DIA ON FLANGE END; HAS GROOVE FOR O-RING IN
SURFACE TREATMENTPAINT
THREAD CLASS3B
MATERIALSTEEL
THREAD SIZE AND SERIES/TYPE DESIGNATOR1.500-6 UNIFIED NATIONAL COARSE (UNC)
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES 1
5497637-2Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 5497637-1?
5497637-1 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace 5497637-1?
There is 1 known substitute for 5497637-1: 5497637-2. Substitute compatibility should be verified for your specific system.
What is the NSN for 5497637-1?
5497637-1 is cataloged in the U.S. Government catalog under NSN 5340-01-297-6404. 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.