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Technical Data Sheet
PartsTable / COMPONENT / 1891PC4
1891PC4 ✓ 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: RUBBER OVERALL, hole_diameter: 0.188 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, outside_diameter: 2.188 INCHES NOMINAL IN, style_designator: CIRCULAR, aperture_diameter: 1.275 INCHES NOMINAL IN, bolt_hole_quantity: 12. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-828-8748, 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
1891PC4
NSN: 5330-00-828-8748
FSC: 5330
CAGE: 24658 — GENERAL REGULATOR CORP. DBA ACCUDRIV (USA)
SPECIFICATIONS
materialRUBBER OVERALL
hole_diameter0.188 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
outside_diameter2.188 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter1.275 INCHES NOMINAL IN
bolt_hole_quantity12
bolt_circle_diameter1.812 INCHES NOMINAL IN
cross-sectional_thickness0.013 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
material_document_and_classificationMR27 FSCM 76376 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NSN5330-00-828-8748
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1891PC4 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
•
APERTURE DIAMETER: 1.275 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 2.188 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CIRCULAR
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
MATERIAL: RUBBER OVERALL
•
HOLE DIAMETER: 0.188 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MR27 FSCM 76376 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
BOLT CIRCLE DIAMETER: 1.812 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
APERTURE DIAMETER1.275 INCHES NOMINAL IN
OUTSIDE DIAMETER2.188 INCHES NOMINAL IN
STYLE DESIGNATORCIRCULAR
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
MATERIALRUBBER OVERALL
HOLE DIAMETER0.188 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
MATERIAL DOCUMENT AND CLASSIFICATIONMR27 FSCM 76376 MFR REF SINGLE MATERIAL RESPONSE OVERALL
BOLT CIRCLE DIAMETER1.812 INCHES NOMINAL IN
BOLT HOLE QUANTITY12
CROSS-SECTIONAL THICKNESS0.013 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
81523Interchangeable
interchangeable cross-reference
interchangeable
ZZ90060Interchangeable
interchangeable cross-reference
interchangeable
18924Interchangeable
interchangeable cross-reference
interchangeable
QQ-A-200/3Interchangeable
interchangeable cross-reference
interchangeable
ASTM B221Interchangeable
interchangeable cross-reference
interchangeable
60-2447Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1891PC4?
1891PC4 is a GASKET.
What parts can replace 1891PC4?
There are 14 known substitutes for 1891PC4: 81523, ZZ90060, 18924 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1891PC4?
1891PC4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-828-8748. 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