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Technical Data Sheet
PartsTable / COMPONENT / A-821
A-821 ✓ 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 BOLT,MACHINE is a the manufacturer industrial component. Key specifications include inclosure_type: HERMETICALLY SEALED, overall_length: 0.385 INCHES NOMINAL IN, overall_diameter: 0.50 INCHES NOMINAL IN, basic_shape_style: IRREGULAR, connection_contact_type_and_quantity: 3 PIN EXTERNAL, part_name_assigned_by_controlling_agency: CASCADABLE AMPLIFIER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-104-2659, 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
A-821
NSN: 5330-00-104-2659
FSC: 5330
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
inclosure_typeHERMETICALLY SEALED
overall_length0.385 INCHES NOMINAL IN
overall_diameter0.50 INCHES NOMINAL IN
special_featuresTWO STAGE SILICON BIPOLAR FEEDBACK AMPLIFIER DESIGN; HIGH REVERSE ISOLATION GREATER THAN 34 DB; HIGH OUTPUT POWER PLUS 15 DBM; HIGH GAIN 19.0 DB; LOW OUTPUT VSWR 1.1:1; DB
basic_shape_styleIRREGULAR
connection_contact_type_and_quantity3 PIN EXTERNAL
part_name_assigned_by_controlling_agencyCASCADABLE AMPLIFIER
NSN5330-00-104-2659
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A-821 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
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESCROSS-SECTIONAL SHAPE STYLE:116 IRREGULAR SHAPE FROM OLD FIIG A03200
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
355526SInterchangeable
interchangeable cross-reference
interchangeable
A821Interchangeable
interchangeable cross-reference
interchangeable
6-73-1117Interchangeable
interchangeable cross-reference
interchangeable
MS24665-132Interchangeable
interchangeable cross-reference
interchangeable
103361Interchangeable
interchangeable cross-reference
interchangeable
TR50-80Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A-821?
A-821 is a BOLT,MACHINE.
What parts can replace A-821?
There are 7 known substitutes for A-821: 355526S, A821, 6-73-1117 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A-821?
A-821 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-104-2659. 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