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NSN 5331-01-278-3793Government record, cited
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O-Ring5331-01-278-3793

NSN 5331-01-278-3793 · NIIN 012783793 · Part number ST521Z6B
Haywardindl. Products, Inc. · FSC 5331 — O-ring · FSG 53 — Hardware and Abrasives · CAGE 73124
Government record, cited
NSN 5331-01-278-3793 — this item is cataloged by the U.S. Government under National Stock Number 5331-01-278-3793. Manufacturer of record part number: ST521Z6B.
Also searched as  5331-01-278-3793 · 5331012783793 · NIIN 012783793 · 01-278-3793 · FSC 5331 O-ring · CAGE 73124 · ST521Z6B
Nearby stock numbers  ·
SECTION O-RING CROSS SECTION
5331-01-278-3793 — O-ring
Features
  • O-Ring — FSC 5331
  • Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
  • 1 manufacturer part number on file
  • Manufacturer of record: Haywardindl. Products, Inc.
Identification
  • NSN: 5331-01-278-3793
  • NIIN: 012783793
  • FSC: 5331 — O-ring
  • FSG: 53 — Hardware and Abrasives
  • Primary part number: ST521Z6B
  • Manufacturer: Haywardindl. Products, Inc.
General Description

The O-Ring, cataloged under National Stock Number 5331-01-278-3793, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Haywardindl. Products, Inc.. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5331-01-278-3793
Primary Part NumberST521Z6B
Item NameO-Ring
FSC / FSG5331 / 53 — O-ring
ManufacturerHaywardindl. Products, Inc.
StatusACTIVE
MaterialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
Lifecycle & Compliance
Acquisition StatusACTIVE
DEMIL CodeDEMIL A — No Demilitarization Required
HazardNo hazard code in the DLA record (HMIC N)
Criticality CodeX
Cross-Reference Index
Part NumberManufacturer
ST521Z6B PRIMARY Haywardindl. Products, Inc. (USA)
No interchangeability data on file.
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
O-RING
5331-00-001-1979
O-RING
5331-00-001-3904
O-RING
5331-00-001-3905
O-RING
5331-00-001-3906
O-RING
5331-00-001-3908
O-RING
5331-00-001-3923
O-RING
5331-00-001-3924
O-RING

Frequently Asked Questions

What is NSN 5331-01-278-3793?

NSN 5331-01-278-3793 is a O-Ring, manufactured by Haywardindl. Products, Inc., classified under FSC 5331, O-ring. Status: active.

What part numbers are listed for NSN 5331-01-278-3793?

NSN 5331-01-278-3793 has 1 manufacturer part number on file: ST521Z6B (Haywardindl. Products, Inc.).

What are the specifications of ST521Z6B?

Key specifications for ST521Z6B: Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR. 1 specification is documented in the U.S. Government catalog.

Is NSN 5331-01-278-3793 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

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✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.
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