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Technical Data Sheet
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5-256NBR — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

5-256NBR: O-RING.

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 NOMINAL, center_hole_diameter: 17.96 MILLIMETERS NOMINAL MM, end_item_identification: FOR ISO 1179-1/DIN 3852-2 PORT, nondefinitive_spec/std_data: 2.62MM WIDTH MM, part_name_assigned_by_controlling_agency: O-RING 1/2 INCH-14 IN. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-682-9571, 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
5-256NBR
NSN: 5331-01-682-9571
NIINs: 016829571, 017276023
FSC: 5331 — O-ring
CAGE: 30780 — PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV TUBE FITTINGS DIVISION (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
hardness_rating90.0 SHORE DUROMETER A NOMINAL
center_hole_diameter17.96 MILLIMETERS NOMINAL MM
end_item_identificationFOR ISO 1179-1/DIN 3852-2 PORT
nondefinitive_spec/std_data2.62MM WIDTH MM
part_name_assigned_by_controlling_agencyO-RING 1/2 INCH-14 IN
NSN5331-01-682-9571
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 5-256NBR 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
•
HARDNESS RATING: 90.0 SHORE DUROMETER A NOMINAL
•
NONDEFINITIVE SPEC/STD DATA: 2.62MM WIDTH MM
•
CENTER HOLE DIAMETER: 17.96 MILLIMETERS NOMINAL MM
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
TECHNICAL CHARACTERISTICS
HARDNESS RATING90.0 SHORE DUROMETER A NOMINAL
NONDEFINITIVE SPEC/STD DATA2.62MM WIDTH MM
CENTER HOLE DIAMETER17.96 MILLIMETERS NOMINAL MM
PART NAME ASSIGNED BY CONTROLLING AGENCYO-RING 1/2 INCH-14 IN
END ITEM IDENTIFICATIONFOR ISO 1179-1/DIN 3852-2 PORT
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Shelf-life managedAcquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 5-256NBR?
5-256NBR is a O-RING.
What is the NSN for 5-256NBR?
5-256NBR is cataloged in the U.S. Government catalog under NSN 5331-01-682-9571. This indicates validated use in U.S. government and defense supply chains.
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