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Technical Data Sheet
PartsTable / COMPONENT / S821
S821 ✓ 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 SWITCH,TOGGLE is a the manufacturer industrial component. Key specifications include color: BLACK, body_style: BUSHING MOUNT, body_width: 0.945 INCHES NOMINAL IN, body_length: 42.0 MILLIMETERS NOMINAL MM, overall_depth: 0.312 INCHES NOMINAL IN, overall_width: 0.945 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-194-3739, 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
S821
NSN: 5330-00-194-3739
FSC: 5330
CAGE: 73277 — HOUGHTON INTERNATIONAL INC. (USA)
SPECIFICATIONS
colorBLACK
body_styleBUSHING MOUNT
body_width0.945 INCHES NOMINAL IN
body_length42.0 MILLIMETERS NOMINAL MM
overall_depth0.312 INCHES NOMINAL IN
overall_width0.945 INCHES NOMINAL IN
actuator_styleROUND
bushing_length0.410 INCHES NOMINAL IN
inclosure_typeFULLY INCLOSED
overall_length42.0 MILLIMETERS NOMINAL MM
actuator_height0.866 INCHES NOMINAL IN
inside_diameter0.138 INCHES NOMINAL IN
NSN5330-00-194-3739
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: S821 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
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 4.094 INCHES MINIMUM AND 4.124 INCHES MAXIMUM IN
•
ELONGATION PERCENTAGE: 164 MAXIMUM
•
PERIPHERAL DIAMETER: 4.351 INCHES MINIMUM AND 4.423 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
CENTER HOLE DIAMETER4.094 INCHES MINIMUM AND 4.124 INCHES MAXIMUM IN
ELONGATION PERCENTAGE164 MAXIMUM
PERIPHERAL DIAMETER4.351 INCHES MINIMUM AND 4.423 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
N304-7-21Interchangeable
interchangeable cross-reference
interchangeable
AN6230-21Interchangeable
interchangeable cross-reference
interchangeable
2-243 N304-75Interchangeable
interchangeable cross-reference
interchangeable
MS28775-243ESInterchangeable
interchangeable cross-reference
interchangeable
2-243-N304-7Interchangeable
interchangeable cross-reference
interchangeable
AN6230B21Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S821?
S821 is a SWITCH,TOGGLE.
What parts can replace S821?
There are 21 known substitutes for S821: N304-7-21, AN6230-21, 2-243 N304-75 and 18 more. Substitute compatibility should be verified for your specific system.
Is S821 still available?
S821 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