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PartsTable / COMPONENT / BHMA A156.20
BHMA A156.20 ✓ 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 BHMA A156.20 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 5340-00-291-3580, 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
BHMA A156.20
NSN: 5340-00-291-3580
FSC: 5340
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
Part NumberBHMA A156.20
NSN5340-00-291-3580
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: BHMA A156.20 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: FED STD 66, COMP 410, 416 OR 430 FED STD SINGLE MATERIAL RESPONSE BODY
•
MATERIAL: COPPER ALLOY AND STEEL CORROSION RESISTING PIN
•
MATERIAL THICKNESS: 0.058 INCHES NOMINAL IN
•
UNABLE TO DECODE: UNABLE TO DECODE
•
MOUNTING HOLE DIAMETER: 0.128 INCHES NOMINAL IN
•
BODY WIDTH: 1.000 INCHES NOMINAL IN
•
KNUCKLE TYPE: FRICTION
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66, COMP 410, 416 OR 430 FED STD SINGLE MATERIAL RESPONSE BODY
MATERIALCOPPER ALLOY AND STEEL CORROSION RESISTING PIN
MATERIAL THICKNESS0.058 INCHES NOMINAL IN
UNABLE TO DECODEUNABLE TO DECODE
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 DIAMETER0.128 INCHES NOMINAL IN
BODY WIDTH1.000 INCHES NOMINAL IN
KNUCKLE TYPEFRICTION
KNUCKLE QUANTITY3
MATERIALSTEEL CORROSION RESISTING BODY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
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
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BHMA A156.20?
BHMA A156.20 is a BHMA A156.20.
What parts can replace BHMA A156.20?
There are 25 known substitutes for BHMA A156.20: SC922, FFH116, ANSI/ BHMA A156.20- A81221 and 22 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BHMA A156.20?
BHMA A156.20 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-291-3580. 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