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157D3690 — GASKET

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

157D3690: GASKET.

The GASKET is a the manufacturer industrial component. Key specifications include material: RUBBER CHLOROPRENE CLASS CR OVERALL, hardness_rating: 45.0 SHORE DUROMETER A MINIMUM AND 55.0 SHORE DUROMETER A MAXIMUM OVERALL, outside_diameter: 5.580 INCHES MINIMUM AND 5.620 INCHES MAXIMUM IN, aperture_diameter: 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN, cross-sectional_thickness: 0.032 INCHES NOMINAL IN, largest_bolt_hole_diameter: 0.730 INCHES MINIMUM AND 0.770 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-312-9991, 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
157D3690
NSN: 5330-01-312-9991
FSC: 5330 — Packing and Gasket Materials
CAGE: 05606 — GENERAL DYNAMICS-OTS, INC. DIV ORDNANCE AND TACTICAL SYSTEMS (USA)
SPECIFICATIONS
materialRUBBER CHLOROPRENE CLASS CR OVERALL
hardness_rating45.0 SHORE DUROMETER A MINIMUM AND 55.0 SHORE DUROMETER A MAXIMUM OVERALL
outside_diameter5.580 INCHES MINIMUM AND 5.620 INCHES MAXIMUM IN
aperture_diameter0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN
cross-sectional_thickness0.032 INCHES NOMINAL IN
largest_bolt_hole_diameter0.730 INCHES MINIMUM AND 0.770 INCHES MAXIMUM IN
largest_bolt_hole_quantity3
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
smallest_bolt_hole_diameter0.176 INCHES MINIMUM AND 0.216 INCHES MAXIMUM IN
smallest_bolt_hole_quantity6
material_document_and_classificationMIL-R-6855,CLASS 2,TYPE A OR B,GRADE 50 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-01-312-9991
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 157D3690 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
•
SMALLEST BOLT HOLE QUANTITY: 6
•
CROSS-SECTIONAL THICKNESS: 0.032 INCHES NOMINAL IN
•
LARGEST BOLT HOLE QUANTITY: 3
•
HARDNESS RATING: 45.0 SHORE DUROMETER A MINIMUM AND 55.0 SHORE DUROMETER A MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-6855,CLASS 2,TYPE A OR B,GRADE 50 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SMALLEST BOLT HOLE DIAMETER: 0.176 INCHES MINIMUM AND 0.216 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
OUTSIDE DIAMETER: 5.580 INCHES MINIMUM AND 5.620 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SMALLEST BOLT HOLE QUANTITY6
CROSS-SECTIONAL THICKNESS0.032 INCHES NOMINAL IN
LARGEST BOLT HOLE QUANTITY3
HARDNESS RATING45.0 SHORE DUROMETER A MINIMUM AND 55.0 SHORE DUROMETER A MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-6855,CLASS 2,TYPE A OR B,GRADE 50 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
SMALLEST BOLT HOLE DIAMETER0.176 INCHES MINIMUM AND 0.216 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
OUTSIDE DIAMETER5.580 INCHES MINIMUM AND 5.620 INCHES MAXIMUM IN
APERTURE DIAMETER0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN
LARGEST BOLT HOLE DIAMETER0.730 INCHES MINIMUM AND 0.770 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5330 — Packing and Gasket Materials
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5330-00-000-0085 5330-00-000-0167 5330-00-000-5275 5330-00-001-1260 5330-00-001-1833 5330-00-001-1844 5330-00-001-1845 5330-00-001-1846
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Shelf-life managedAcquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 157D3690?
157D3690 is a GASKET.
What is the NSN for 157D3690?
157D3690 is cataloged in the U.S. Government catalog under NSN 5330-01-312-9991. 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.