Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW
The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR, temp_rating: -65.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF, hardness_rating: 75.0 SHORE DUROMETER A NOMINAL, outside_diameter: 3.520 INCHES NOMINAL IN, center_hole_diameter: 3.076 INCHES MINIMUM AND 3.124 INCHES MAXIMUM IN, cross-sectional_height: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.
This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-162-4705, 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
72721-21X3 PIECE 12
NSN:5331-01-162-4705 FSC:5331 — O-RING CAGE:96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
material
RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
temp_rating
-65.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF
hardness_rating
75.0 SHORE DUROMETER A NOMINAL
outside_diameter
3.520 INCHES NOMINAL IN
center_hole_diameter
3.076 INCHES MINIMUM AND 3.124 INCHES MAXIMUM IN
cross-sectional_height
0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
NSN
5331-01-162-4705
COMPONENT DIAGRAM
KEY FEATURES
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
OUTSIDE DIAMETER: 3.520 INCHES NOMINAL IN
•
TEMP RATING: -65.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF
•
CENTER HOLE DIAMETER: 3.076 INCHES MINIMUM AND 3.124 INCHES MAXIMUM IN
•
CROSS-SECTIONAL HEIGHT: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
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FREQUENTLY ASKED QUESTIONS
What is 72721-21X3 PIECE 12?
72721-21X3 PIECE 12 is a O-RING.
What parts can replace 72721-21X3 PIECE 12?
There are 14 known substitutes for 72721-21X3 PIECE 12: 54A125-338, 6227-41, N230-7-2-338 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 72721-21X3 PIECE 12?
72721-21X3 PIECE 12 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-162-4705. This indicates validated use in U.S. government and defense supply chains.
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