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PartsTable / COMPONENT / ANSI A156.9 B21491
ANSI A156.9 B21491 ✓ 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 ANSI A156.9 B21491 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-229-4373, 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
ANSI A156.9 B21491
NSN: 5340-00-229-4373
FSC: 5340
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
Part NumberANSI A156.9 B21491
NSN5340-00-229-4373
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ANSI A156.9 B21491 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
•
PERFORMANCE TYPE: REGULAR DUTY
•
KNUCKLE QUANTITY: 96
•
MOUNTING HOLE DIAMETER: 0.144 INCHES NOMINAL IN
•
PIN REMOVABILITY: NONREMOVABLE
•
PIN CENTER TO BODY EDGE DISTANCE: 1.000 INCHES NOMINAL IN
•
HINGE MOUNTING TYPE: FULL SURFACE
•
KNUCKLE TYPE: FRICTION
TECHNICAL CHARACTERISTICS (FLIS)
PERFORMANCE TYPEREGULAR DUTY
OVERALL LENGTH72.000 INCHES NOMINAL IN
KNUCKLE QUANTITY96
MOUNTING HOLE DIAMETER0.144 INCHES NOMINAL IN
PIN REMOVABILITYNONREMOVABLE
PIN CENTER TO BODY EDGE DISTANCE1.000 INCHES NOMINAL IN
HINGE MOUNTING TYPEFULL SURFACE
KNUCKLE TYPEFRICTION
PIN DIAMETER0.131 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONUNABLE TO DECODE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
BHMA-A156.20Upgraded Successor
successor cross-reference
successor
MS27970-26Upgraded Successor
successor cross-reference
successor
FFH116Upgraded Successor
successor cross-reference
successor
BHMA-A156.1 A8133 3-1/2INUpgraded Successor
successor cross-reference
successor
A8133Upgraded Successor
successor cross-reference
successor
ANSI A156.1 A8133Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ANSI A156.9 B21491?
ANSI A156.9 B21491 is a ANSI A156.9 B21491.
What parts can replace ANSI A156.9 B21491?
There are 21 known substitutes for ANSI A156.9 B21491: BHMA-A156.20, MS27970-26, FFH116 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ANSI A156.9 B21491?
ANSI A156.9 B21491 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-229-4373. 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