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Technical Data Sheet
PartsTable / O-RING / HI-721-3100 IT 145
HI-721-3100 IT 145 ✓ 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 O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR, hardness_rating: 90.0 SHORE DUROMETER A MINIMUM, center_hole_diameter: 1.475 INCHES NOMINAL IN, cross-sectional_height: 0.118 INCHES NOMINAL 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 5331-01-522-2221, 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
HI-721-3100 IT 145
NSN: 5331-01-522-2221
FSC: 5331 — O-RING
CAGE: 7N931 — HHE SERVICES, INC. (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
hardness_rating90.0 SHORE DUROMETER A MINIMUM
center_hole_diameter1.475 INCHES NOMINAL IN
cross-sectional_height0.118 INCHES NOMINAL IN
NSN5331-01-522-2221
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: HI-721-3100 IT 145 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
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
•
CENTER HOLE DIAMETER: 1.475 INCHES NOMINAL IN
•
HARDNESS RATING: 90.0 SHORE DUROMETER A MINIMUM
•
CROSS-SECTIONAL HEIGHT: 0.118 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
CENTER HOLE DIAMETER1.475 INCHES NOMINAL IN
HARDNESS RATING90.0 SHORE DUROMETER A MINIMUM
CROSS-SECTIONAL HEIGHT0.118 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
75084HAInterchangeable
interchangeable cross-reference
interchangeable
400020Interchangeable
interchangeable cross-reference
interchangeable
407011Interchangeable
interchangeable cross-reference
interchangeable
2590101Interchangeable
interchangeable cross-reference
interchangeable
08136-11MInterchangeable
interchangeable cross-reference
interchangeable
3512Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is HI-721-3100 IT 145?
HI-721-3100 IT 145 is a O-RING.
What parts can replace HI-721-3100 IT 145?
There are 7 known substitutes for HI-721-3100 IT 145: 75084HA, 400020, 407011 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for HI-721-3100 IT 145?
HI-721-3100 IT 145 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-522-2221. 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