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Technical Data Sheet
PartsTable / O-RING / 71999PC21
71999PC21 ✓ 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 O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC, outside_diameter: 4.395 INCHES NOMINAL IN, center_hole_diameter: 3.960 INCHES MINIMUM AND 3.990 INCHES MAXIMUM IN, cross-sectional_height: 0.205 INCHES MINIMUM AND 0.215 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 5331-00-612-2934, 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
71999PC21
NSN: 5331-00-612-2934
FSC: 5331 — O-RING
CAGE: 75545 — LAWLER MANUFACTURING COMPANY, INC. (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
outside_diameter4.395 INCHES NOMINAL IN
center_hole_diameter3.960 INCHES MINIMUM AND 3.990 INCHES MAXIMUM IN
cross-sectional_height0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
NSN5331-00-612-2934
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 71999PC21 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
•
MATERIAL: RUBBER SYNTHETIC
•
OUTSIDE DIAMETER: 4.395 INCHES NOMINAL IN
•
CENTER HOLE DIAMETER: 3.960 INCHES MINIMUM AND 3.990 INCHES MAXIMUM IN
•
CROSS-SECTIONAL HEIGHT: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALRUBBER SYNTHETIC
OUTSIDE DIAMETER4.395 INCHES NOMINAL IN
CENTER HOLE DIAMETER3.960 INCHES MINIMUM AND 3.990 INCHES MAXIMUM IN
CROSS-SECTIONAL HEIGHT0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
6640Interchangeable
interchangeable cross-reference
interchangeable
6640-0Interchangeable
interchangeable cross-reference
interchangeable
N0S40Interchangeable
interchangeable cross-reference
interchangeable
E111-040Interchangeable
interchangeable cross-reference
interchangeable
OTS40Interchangeable
interchangeable cross-reference
interchangeable
35 3/4 REDInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 71999PC21?
71999PC21 is a O-RING.
What parts can replace 71999PC21?
There are 19 known substitutes for 71999PC21: 6640, 6640-0, N0S40 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 71999PC21?
71999PC21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-612-2934. 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