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Technical Data Sheet
PartsTable / O-RING / 71997PC21
71997PC21 ✓ 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, center_hole_diameter: 2.710 INCHES MINIMUM AND 2.740 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 5331-01-006-2128, 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
71997PC21
NSN: 5331-01-006-2128
FSC: 5331 — O-RING
CAGE: 75545 — LAWLER MANUFACTURING COMPANY, INC. (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
center_hole_diameter2.710 INCHES MINIMUM AND 2.740 INCHES MAXIMUM IN
cross-sectional_height0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
NSN5331-01-006-2128
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 71997PC21 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 HEIGHT: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
•
MATERIAL: RUBBER SYNTHETIC
•
CENTER HOLE DIAMETER: 2.710 INCHES MINIMUM AND 2.740 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL HEIGHT0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
MATERIALRUBBER SYNTHETIC
CENTER HOLE DIAMETER2.710 INCHES MINIMUM AND 2.740 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
GC3510KAC20-5Interchangeable
interchangeable cross-reference
interchangeable
6516Interchangeable
interchangeable cross-reference
interchangeable
5500Interchangeable
interchangeable cross-reference
interchangeable
6515Interchangeable
interchangeable cross-reference
interchangeable
065-00016Interchangeable
interchangeable cross-reference
interchangeable
65-16PKInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 71997PC21?
71997PC21 is a O-RING.
What parts can replace 71997PC21?
There are 11 known substitutes for 71997PC21: GC3510KAC20-5, 6516, 5500 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 71997PC21?
71997PC21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-006-2128. 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