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Technical Data Sheet
PartsTable / O-RING / 500921
500921 ✓ 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 SEMICONDUCTOR DEVICES,UNITIZED is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR, temp_rating: -30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF, overall_length: 0.210 INCHES MAXIMUM IN, hardness_rating: 70.0 SHORE DUROMETER A NOMINAL, mounting_method: TERMINAL, terminal_length: 0.500 INCHES MINIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-012-5148, 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
500921
NSN: 5331-01-012-5148
FSC: 5331 — O-RING
CAGE: 25993 — EDGEONE LLC DBA ORE OFFSHORE DIV ORE OFFSHORE (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
temp_rating-30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF
overall_length0.210 INCHES MAXIMUM IN
hardness_rating70.0 SHORE DUROMETER A NOMINAL
mounting_methodTERMINAL
terminal_length0.500 INCHES MINIMUM IN
outside_diameter5.137 INCHES NOMINAL IN
overall_diameter0.230 INCHES MAXIMUM IN
special_featuresPCB ASSY,WITH ROTARY SWITCH; END ITEM APPLICATION 6525-01-370-7552; X-RAY APPARATUS,DENTAL; MODEL ALPHA MPDX
features_providedHERMETICALLY SEALED CASE
center_hole_diameter4.859 INCHES NOMINAL IN
elongation_percentage331 MAXIMUM
NSN5331-01-012-5148
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 500921 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
•
ELONGATION PERCENTAGE: 331 MAXIMUM
•
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
OUTSIDE DIAMETER: 5.137 INCHES NOMINAL IN
•
CROSS-SECTIONAL HEIGHT: 0.139 INCHES NOMINAL IN
•
TEMP RATING: -30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF
•
CENTER HOLE DIAMETER: 4.859 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
ELONGATION PERCENTAGE331 MAXIMUM
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
OUTSIDE DIAMETER5.137 INCHES NOMINAL IN
CROSS-SECTIONAL HEIGHT0.139 INCHES NOMINAL IN
TEMP RATING-30.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF
CENTER HOLE DIAMETER4.859 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
50325Interchangeable
interchangeable cross-reference
interchangeable
495LXInterchangeable
interchangeable cross-reference
interchangeable
SM-B-148337Interchangeable
interchangeable cross-reference
interchangeable
7827WAInterchangeable
interchangeable cross-reference
interchangeable
6685PL0887626Interchangeable
interchangeable cross-reference
interchangeable
195810Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 500921?
500921 is a SEMICONDUCTOR DEVICES,UNITIZED.
What parts can replace 500921?
There are 21 known substitutes for 500921: 50325, 495LX, SM-B-148337 and 18 more. Substitute compatibility should be verified for your specific system.
Is 500921 still available?
500921 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