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P321-13 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

P321-13: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER, outside_diameter: 0.750 INCHES NOMINAL IN, special_features: MATERIAL:BUNA-N SHORE 70, center_hole_diameter: 0.4375 INCHES NOMINAL IN, cross-sectional_height: 0.125 INCHES NOMINAL IN, part_name_assigned_by_controlling_agency: O-RING,3/4 INCH I.D. X 7/8 INCH O.D.AS568A DASH NUMBER 018,BUNA-N SHORE 70,BLACK IN.

This part is cataloged in the U.S. Government catalog under NSN 5331-01-603-5775, 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
P321-13
NSN: 5331-01-603-5775
FSC: 5331 — O-ring
CAGE: 75214 — KAHLENBERG INDUSTRIES, INC. DBA KAHLENBERG INDUSTRIES INC (USA)
SPECIFICATIONS
materialRUBBER
outside_diameter0.750 INCHES NOMINAL IN
special_featuresMATERIAL:BUNA-N SHORE 70
center_hole_diameter0.4375 INCHES NOMINAL IN
cross-sectional_height0.125 INCHES NOMINAL IN
part_name_assigned_by_controlling_agencyO-RING,3/4 INCH I.D. X 7/8 INCH O.D.AS568A DASH NUMBER 018,BUNA-N SHORE 70,BLACK IN
NSN5331-01-603-5775
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: P321-13 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
•
CROSS-SECTIONAL HEIGHT: 0.125 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.750 INCHES NOMINAL IN
•
COLOR: BLACK
•
CENTER HOLE DIAMETER: 0.4375 INCHES NOMINAL IN
•
MATERIAL: RUBBER
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.125 INCHES NOMINAL IN
OUTSIDE DIAMETER0.750 INCHES NOMINAL IN
COLORBLACK
SPECIAL FEATURESMATERIAL:BUNA-N SHORE 70
CENTER HOLE DIAMETER0.4375 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYO-RING,3/4 INCH I.D. X 7/8 INCH O.D.AS568A DASH NUMBER 018,BUNA-N SHORE 70,BLACK IN
MATERIALRUBBER
OTHER ITEMS IN FSC 5331 — O-ring
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5331-00-001-1971 5331-00-001-1979 5331-00-001-3904 5331-00-001-3905 5331-00-001-3906 5331-00-001-3908 5331-00-001-3923 5331-00-001-3924
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is P321-13?
P321-13 is a O-RING.
What is the NSN for P321-13?
P321-13 is cataloged in the U.S. Government catalog under NSN 5331-01-603-5775. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.