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PartsTable / COMPONENT / 3000785 PC21
3000785 PC21 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The GASKET is a the manufacturer industrial component. Key specifications include material: ASBESTOS AND COPPER OVERALL, hole_diameter: 0.688 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, outside_diameter: 5.688 INCHES NOMINAL IN, style_designator: CIRCULAR, aperture_diameter: 2.531 INCHES NOMINAL IN, bolt_circle_diameter: 4.562 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-255-2570, 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
3000785 PC21
NSN: 5330-00-255-2570
FSC: 5330
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialASBESTOS AND COPPER OVERALL
hole_diameter0.688 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
outside_diameter5.688 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter2.531 INCHES NOMINAL IN
bolt_hole_quantity8
bolt_circle_diameter4.562 INCHES NOMINAL IN
cross-sectional_thickness0.047 INCHES NOMINAL IN
cross-sectional_shape_styleMETAL WITH SOFT FILLER
NSN5330-00-255-2570
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3000785 PC21 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
•
CROSS-SECTIONAL THICKNESS: 0.047 INCHES NOMINAL IN
•
MATERIAL: ASBESTOS AND COPPER OVERALL
•
STYLE DESIGNATOR: CIRCULAR
•
APERTURE DIAMETER: 2.531 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 5.688 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.688 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
BOLT CIRCLE DIAMETER: 4.562 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 8
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL THICKNESS0.047 INCHES NOMINAL IN
MATERIALASBESTOS AND COPPER OVERALL
STYLE DESIGNATORCIRCULAR
APERTURE DIAMETER2.531 INCHES NOMINAL IN
OUTSIDE DIAMETER5.688 INCHES NOMINAL IN
HOLE DIAMETER0.688 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
BOLT CIRCLE DIAMETER4.562 INCHES NOMINAL IN
BOLT HOLE QUANTITY8
CROSS-SECTIONAL SHAPE STYLEMETAL WITH SOFT FILLER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
13648Interchangeable
interchangeable cross-reference
interchangeable
176Interchangeable
interchangeable cross-reference
interchangeable
173-57Interchangeable
interchangeable cross-reference
interchangeable
5473182Interchangeable
interchangeable cross-reference
interchangeable
271610Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3000785 PC21?
3000785 PC21 is a GASKET.
What parts can replace 3000785 PC21?
There are 5 known substitutes for 3000785 PC21: 13648, 176, 173-57 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3000785 PC21?
3000785 PC21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-255-2570. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026