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PartsTable / COMPONENT / 66B42821
66B42821 ✓ 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 STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 0.531 INCHES NOMINAL IN, left_slot_width: 0.062 INCHES NOMINAL IN, style_designator: INTERNALLY THREADED FULL LENGTH, width_across_flats: 0.250 INCHES NOMINAL IN, cross-sectional_shape: HEXAGON. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-811-1206, 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
66B42821
NSN: 5340-00-811-1206
FSC: 5340
CAGE: 98749 — SACRAMENTO AIR LOGISTICS CENTER SM-ALC/LIIL (USA)
SPECIFICATIONS
length0.531 INCHES NOMINAL IN
left_slot_width0.062 INCHES NOMINAL IN
style_designatorINTERNALLY THREADED FULL LENGTH
width_across_flats0.250 INCHES NOMINAL IN
cross-sectional_shapeHEXAGON
NSN5340-00-811-1206
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 66B42821 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
•
LENGTH: 0.531 INCHES NOMINAL IN
•
LEFT SLOT WIDTH: 0.062 INCHES NOMINAL IN
•
STYLE DESIGNATOR: INTERNALLY THREADED FULL LENGTH
•
WIDTH ACROSS FLATS: 0.250 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
LENGTH0.531 INCHES NOMINAL IN
LEFT SLOT WIDTH0.062 INCHES NOMINAL IN
STYLE DESIGNATORINTERNALLY THREADED FULL LENGTH
WIDTH ACROSS FLATS0.250 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
121795Interchangeable
interchangeable cross-reference
interchangeable
TYPE4Interchangeable
interchangeable cross-reference
interchangeable
4Interchangeable
interchangeable cross-reference
interchangeable
DE-B-4497Interchangeable
interchangeable cross-reference
interchangeable
067266Interchangeable
interchangeable cross-reference
interchangeable
XT4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 66B42821?
66B42821 is a STANDOFF,THREADED,SPACING.
What parts can replace 66B42821?
There are 13 known substitutes for 66B42821: 121795, TYPE4, 4 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 66B42821?
66B42821 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-811-1206. 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