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Technical Data Sheet
PartsTable / COMPONENT / A156.20 A81221
A156.20 A81221 ✓ 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 A156.20 A81221 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-240-2580, 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
A156.20 A81221
NSN: 5340-00-240-2580
FSC: 5340
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
Part NumberA156.20 A81221
NSN5340-00-240-2580
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A156.20 A81221 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 DOCUMENT AND CLASSIFICATION: QQ-B-626, COMP 11 FED SPEC SINGLE MATERIAL RESPONSE AND FED STD 66, COMP 302, 303, OR 304 FED STD SINGLE MATERIAL RESPONSE PIN
•
MOUNTING HOLE QUANTITY: 6
•
SURFACE TREATMENT: ZINC BODY
•
MATERIAL: COPPER ALLOY AND STEEL CORROSION RESISTING PIN
•
REVERSIBLE FEATURE: NOT INCLUDED
•
STYLE DESIGNATOR: STRAP
•
KNUCKLE QUANTITY: 3
•
PERFORMANCE TYPE: NOT RATED
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-626, COMP 11 FED SPEC SINGLE MATERIAL RESPONSE AND FED STD 66, COMP 302, 303, OR 304 FED STD SINGLE MATERIAL RESPONSE PIN
MOUNTING HOLE QUANTITY6
SURFACE TREATMENTZINC BODY
MATERIALCOPPER ALLOY AND STEEL CORROSION RESISTING PIN
REVERSIBLE FEATURENOT INCLUDED
STYLE DESIGNATORSTRAP
KNUCKLE QUANTITY3
PERFORMANCE TYPENOT RATED
PIN CENTER TO BODY EDGE DISTANCE12.000 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A153 ASSN STD SINGLE TREATMENT RESPONSE BODY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
SC922Upgraded Successor
successor cross-reference
successor
FFH116Upgraded Successor
successor cross-reference
successor
ANSI/ BHMA A156.20- A81221Upgraded Successor
successor cross-reference
successor
BHMA-A156.20Interchangeable
interchangeable cross-reference
interchangeable
SC928Interchangeable
interchangeable cross-reference
interchangeable
MS27970-12Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A156.20 A81221?
A156.20 A81221 is a A156.20 A81221.
What parts can replace A156.20 A81221?
There are 21 known substitutes for A156.20 A81221: SC922, FFH116, ANSI/ BHMA A156.20- A81221 and 18 more. Substitute compatibility should be verified for your specific system.
Is A156.20 A81221 still available?
A156.20 A81221 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