PartsTable
Technical Data Sheet
Download PDF

7631991 — BELLOWS,PROTECTION

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

7631991: BELLOWS,PROTECTION.

The BELLOWS,PROTECTION is a the manufacturer industrial component. Key specifications include end_item_identification: AIRCRAFT MODEL F-18. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-202-2177, 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
7631991
NSN: 5340-00-202-2177
NIINs: 002022177, 011274273
FSC: 5340 — Hardware, Commercial
CAGE: 19200 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV LOGISTICS RESEARCH AND ENGINEERING DIRECTORATE (USA)
SPECIFICATIONS
end_item_identificationAIRCRAFT MODEL F-18
NSN5340-00-202-2177
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 7631991 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
•
MOUNTING HOLE QUANTITY: 8
•
LARGE END OUTSIDE LENGTH: 0.210 INCHES NOMINAL IN
•
LARGE END INSIDE DIAMETER: 2.000 INCHES NOMINAL IN
•
LARGE END OUTSIDE DIAMETER: 2.750 INCHES NOMINAL IN
•
SMALL END OUTSIDE DIAMETER: 2.250 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-STD-417, TYPE R, CLASS RS, GRADE 410A1BF2 MIL STD SINGLE MATERIAL RESPONSE
•
MOUNTING HOLE DIAMETER: 0.125 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
•
NEUTRAL LENGTH: 3.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
MOUNTING HOLE QUANTITY8
LARGE END OUTSIDE LENGTH0.210 INCHES NOMINAL IN
LARGE END INSIDE DIAMETER2.000 INCHES NOMINAL IN
LARGE END OUTSIDE DIAMETER2.750 INCHES NOMINAL IN
SMALL END OUTSIDE DIAMETER2.250 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-STD-417, TYPE R, CLASS RS, GRADE 410A1BF2 MIL STD SINGLE MATERIAL RESPONSE
MOUNTING HOLE DIAMETER0.125 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
NEUTRAL LENGTH3.250 INCHES NOMINAL IN
FEATURES PROVIDEDFLANGED BASE
LARGE END INSIDE LENGTH0.250 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
MILR3065Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy 7631991?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 7631991?
7631991 is a BELLOWS,PROTECTION.
What parts can replace 7631991?
There is 1 known substitute for 7631991: MILR3065. Substitute compatibility should be verified for your specific system.
What is the NSN for 7631991?
7631991 is cataloged in the U.S. Government catalog under NSN 5340-00-202-2177. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 7631991

✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.