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Technical Data Sheet
PartsTable / COMPONENT / FF-H-121
FF-H-121 ✓ 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 CLOSER,DOOR is a the manufacturer industrial component. Key specifications include length: 4.000 INCHES NOMINAL OVERALL IN, material: STEEL MOUNTING BRACKET, unit_type: SINGLE ACTION, control_type: AIR, special_features: TUBE DIA:1.125 IN.DIA;COLOR:NO.689 APPENDIX A IN, surface_treatment: LACQUER OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-000-0057, 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
FF-H-121
NSN: 5340-00-000-0057
FSC: 5340
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
length4.000 INCHES NOMINAL OVERALL IN
materialSTEEL MOUNTING BRACKET
unit_typeSINGLE ACTION
control_typeAIR
special_featuresTUBE DIA:1.125 IN.DIA;COLOR:NO.689 APPENDIX A IN
surface_treatmentLACQUER OVERALL
operational_directionLEFT-HAND OR RIGHT-HAND
specification/standard_data80204-A156.4 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
mounting_type_for_which_designedSURFACE
NSN5340-00-000-0057
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: FF-H-121 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
•
OPERATIONAL DIRECTION: LEFT-HAND OR RIGHT-HAND
•
SPECIFICATION/STANDARD DATA: 80204-ANSI A156.4 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
UNIT TYPE: SINGLE ACTION
•
CONTROL TYPE: LIQUID
•
MOUNTING TYPE FOR WHICH DESIGNED: SURFACE
TECHNICAL CHARACTERISTICS (FLIS)
OPERATIONAL DIRECTIONLEFT-HAND OR RIGHT-HAND
SPECIFICATION/STANDARD DATA80204-ANSI A156.4 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
UNIT TYPESINGLE ACTION
CONTROL TYPELIQUID
MOUNTING TYPE FOR WHICH DESIGNEDSURFACE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
FF-H-121Upgraded Successor
successor cross-reference
successor
BHMA-A156.4 C02012 SIZE 5Upgraded Successor
successor cross-reference
successor
BHMA-A156.4Upgraded Successor
successor cross-reference
successor
A156.4 TYPE C02012 SIZE 4Upgraded Successor
successor cross-reference
successor
A-A-1926Upgraded Successor
successor cross-reference
successor
K740/ALUpgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FF-H-121?
FF-H-121 is a CLOSER,DOOR.
What parts can replace FF-H-121?
There are 13 known substitutes for FF-H-121: FF-H-121, BHMA-A156.4 C02012 SIZE 5, BHMA-A156.4 and 10 more. Substitute compatibility should be verified for your specific system.
Is FF-H-121 still available?
FF-H-121 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