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PartsTable / COMPONENT / PM21779
PM21779 ✓ 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 SYNTHETIC OVERALL, hole_diameter: 0.166 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 1.141 INCHES NOMINAL IN, overall_length: 1.141 INCHES NOMINAL IN, style_designator: NON-CIRCULAR, aperture_diameter: 0.925 INCHES MINIMUM AND 0.936 INCHES MAXIMUM 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 5330-00-004-0427, 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
PM21779
NSN: 5330-00-004-0427
FSC: 5330
CAGE: 81579 — MASON ELECTRIC CO. DBA MASON CONTROLS (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
hole_diameter0.166 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width1.141 INCHES NOMINAL IN
overall_length1.141 INCHES NOMINAL IN
style_designatorNON-CIRCULAR
aperture_diameter0.925 INCHES MINIMUM AND 0.936 INCHES MAXIMUM IN
bolt_hole_quantity4
cross-sectional_thickness0.032 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
outside_edge_to_bolt_hole_center_distance_along_width0.117 INCHES NOMINAL IN
outside_edge_to_bolt_hole_center_distance_along_length0.117 INCHES NOMINAL IN
center_to_center_distance_between_bolt_holes_along_width0.906 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
NSN5330-00-004-0427
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: PM21779 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
•
BOLT HOLE QUANTITY: 4
•
APERTURE DIAMETER: 0.925 INCHES MINIMUM AND 0.936 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.166 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG WIDTH: 0.906 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG LENGTH: 0.906 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
MATERIAL: RUBBER SYNTHETIC OVERALL
•
OUTSIDE EDGE TO BOLT HOLE CENTER DISTANCE ALONG LENGTH: 0.117 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BOLT HOLE QUANTITY4
APERTURE DIAMETER0.925 INCHES MINIMUM AND 0.936 INCHES MAXIMUM IN
HOLE DIAMETER0.166 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG WIDTH0.906 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG LENGTH0.906 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
OVERALL WIDTH1.141 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC OVERALL
OUTSIDE EDGE TO BOLT HOLE CENTER DISTANCE ALONG LENGTH0.117 INCHES NOMINAL IN
OUTSIDE EDGE TO BOLT HOLE CENTER DISTANCE ALONG WIDTH0.117 INCHES NOMINAL IN
CROSS-SECTIONAL THICKNESS0.032 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
588 9Interchangeable
interchangeable cross-reference
interchangeable
21779Interchangeable
interchangeable cross-reference
interchangeable
19956Interchangeable
interchangeable cross-reference
interchangeable
D2928-9Interchangeable
interchangeable cross-reference
interchangeable
SM-D-78532Interchangeable
interchangeable cross-reference
interchangeable
200376Y25Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is PM21779?
PM21779 is a GASKET.
What parts can replace PM21779?
There are 10 known substitutes for PM21779: 588 9, 21779, 19956 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for PM21779?
PM21779 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-004-0427. 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