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Technical Data Sheet
PartsTable / COMPONENT / 2640-674X1 PIECE NO. 21
2640-674X1 PIECE NO. 21 ✓ 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 2640-674X1 PIECE NO. 21 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-071-4634, 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
2640-674X1 PIECE NO. 21
NSN: 5330-01-071-4634
FSC: 5330
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
Part Number2640-674X1 PIECE NO. 21
NSN5330-01-071-4634
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 2640-674X1 PIECE NO. 21 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 SHAPE STYLE: SQUARE
•
MATERIAL: PLASTIC POLYTETRAFLUOROETHYLENE OVERALL
•
JOINT TYPE: SCARF-BUTT OVERALL
•
DEPARTURE FROM CITED DOCUMENT: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
•
CUT TYPE: RECTANGULAR OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL THICKNESS: 0.075 INCHES MINIMUM AND 0.087 INCHES MAXIMUM IN
•
PERIPHERAL DIAMETER: 1.620 INCHES MINIMUM AND 1.622 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLESQUARE
MATERIALPLASTIC POLYTETRAFLUOROETHYLENE OVERALL
JOINT TYPESCARF-BUTT OVERALL
DEPARTURE FROM CITED DOCUMENTCLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
CUT TYPERECTANGULAR OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-8791 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL THICKNESS0.075 INCHES MINIMUM AND 0.087 INCHES MAXIMUM IN
PERIPHERAL DIAMETER1.620 INCHES MINIMUM AND 1.622 INCHES MAXIMUM IN
CROSS-SECTIONAL HEIGHT0.025 INCHES MINIMUM AND 0.029 INCHES MAXIMUM IN
CENTER HOLE DIAMETER1.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
SAE-AS8791Interchangeable
interchangeable cross-reference
interchangeable
011222ELInterchangeable
interchangeable cross-reference
interchangeable
982199Interchangeable
interchangeable cross-reference
interchangeable
2640-674X1 PIECE NO. 21CPInterchangeable
Same NIIN cross-reference
interchangeable
MS28782-27Interchangeable
Same NIIN cross-reference
interchangeable
2641-405-01 ITEM 71CPInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2640-674X1 PIECE NO. 21?
2640-674X1 PIECE NO. 21 is a 2640-674X1 PIECE NO. 21.
What parts can replace 2640-674X1 PIECE NO. 21?
There are 11 known substitutes for 2640-674X1 PIECE NO. 21: SAE-AS8791, 011222EL, 982199 and 8 more. Substitute compatibility should be verified for your specific system.
Is 2640-674X1 PIECE NO. 21 still available?
2640-674X1 PIECE NO. 21 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026