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PartsTable / COMPONENT / ANSI/ BHMA A156.20- A81221
ANSI/ BHMA 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 ANSI/ BHMA A156.20- A81221 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-240-2579, 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/ BHMA A156.20- A81221
NSN: 5340-00-240-2579
FSC: 5340
CAGE: 41280 — BUILDERS HARDWARE MFRS ASSN INC (USA)
SPECIFICATIONS
Part NumberANSI/ BHMA A156.20- A81221
NSN5340-00-240-2579
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ANSI/ BHMA 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
•
KNUCKLE QUANTITY: 3
•
REVERSIBLE FEATURE: NOT INCLUDED
•
PIN CENTER TO BODY EDGE DISTANCE: 10.000 INCHES NOMINAL IN
•
MOUNTING HOLE DIAMETER: 0.169 INCHES NOMINAL IN
•
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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A153 ASSN STD SINGLE TREATMENT RESPONSE BODY
•
BODY WIDTH: 3.625 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.139 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
KNUCKLE QUANTITY3
REVERSIBLE FEATURENOT INCLUDED
PIN CENTER TO BODY EDGE DISTANCE10.000 INCHES NOMINAL IN
MOUNTING HOLE DIAMETER0.169 INCHES NOMINAL IN
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
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A153 ASSN STD SINGLE TREATMENT RESPONSE BODY
BODY WIDTH3.625 INCHES NOMINAL IN
MATERIAL THICKNESS0.139 INCHES NOMINAL IN
MOUNTING HOLE QUANTITY6
KNUCKLE TYPEFRICTION
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
BHMA-A156.20Upgraded Successor
successor cross-reference
successor
MS27970-26Upgraded Successor
successor cross-reference
successor
FFH116Upgraded Successor
successor cross-reference
successor
SC928Upgraded Successor
successor cross-reference
successor
MS27970-12Upgraded Successor
successor cross-reference
successor
BHMA-A156.1 A2133 3-1/2INUpgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ANSI/ BHMA A156.20- A81221?
ANSI/ BHMA A156.20- A81221 is a ANSI/ BHMA A156.20- A81221.
What parts can replace ANSI/ BHMA A156.20- A81221?
There are 22 known substitutes for ANSI/ BHMA A156.20- A81221: BHMA-A156.20, MS27970-26, FFH116 and 19 more. Substitute compatibility should be verified for your specific system.
Is ANSI/ BHMA A156.20- A81221 still available?
ANSI/ BHMA 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