PartsTable TECHNICAL DATA SHEET

NSN 5330-01-291-0531Government record, cited

Seal, Plain Encased5330-01-291-0531

NSN 5330-01-291-0531 · NIIN 012910531 · Part number A4377

Thern Inc · FSC 5330 — Packing and Gasket Materials · FSG 53 — Hardware and Abrasives · CAGE 12437

Government record, cited

NSN 5330-01-291-0531 — this item is cataloged by the U.S. Government under National Stock Number 5330-01-291-0531. Manufacturer of record part number: A4377.

Also searched as 5330-01-291-0531 · 5330012910531 · NIIN 012910531 · 01-291-0531 · FSC 5330 Packing and Gasket Materials · CAGE 12437 · A4377 · SL750-1250-250 · D1028 PIECE 35

Nearby stock numbers ← 5330-01-291-0530 Seal, Plain Encased · 5330-01-291-0538 Seal, Plain →

5330-01-291-0531 — Packing and Gasket Materials

Features

Seal,plain Encased — FSC 5330
2 manufacturer part numbers on file
Manufacturer of record: Thern Inc

Identification

NSN: 5330-01-291-0531
NIIN: 012910531
FSC: 5330 — Packing and Gasket Materials
FSG: 53 — Hardware and Abrasives
Primary part number: A4377
Manufacturer: Thern Inc

General Description

The Seal,plain Encased, cataloged under National Stock Number 5330-01-291-0531, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. The manufacturer of record is Thern Inc. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.

Catalog Facts

Item Name	Seal,plain Encased
FSC / FSG	5330 — Packing and Gasket Materials (FSG 53)
Manufacturers	Thern Inc (CAGE 12437)

Technical Specifications

Parameter	Value
NSN	5330-01-291-0531
Primary Part Number	A4377
Item Name	Seal,plain Encased
FSC / FSG	5330 / 53 — Packing and Gasket Materials
Manufacturer	Thern Inc
Status	ACTIVE

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	Possible hazard — SDS may be required (DLA HMIC P)

Cross-Reference Index

Part Number	Manufacturer
A4377 PRIMARY	Thern Inc (USA)
D1028 PIECE 35	Thern Inc (USA)

Reference documents

Reference	Meaning
SL750-1250-250	5/9 Secondary reference Thern Inc

No interchangeability data on file.

Other items in FSC 5330 — Packing and Gasket Materials

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5330-00-000-0085

RETAINER

5330-00-000-0167

PARTS KIT,SEAL REPLACEMENT,MECHA

5330-00-000-5275

5330-00-000-5275 · Item name not on file

5330-00-001-1260

SEAL,NONMETALLIC SPECIAL SHAPED

5330-00-001-1833

SEAL,PLAIN ENCASED

5330-00-001-1844

GLAND,RESERVOIR,INDICATOR END

5330-00-001-1845

5330-00-001-1845 · Item name not on file

5330-00-001-1846

5330-00-001-1846 · Item name not on file

Frequently Asked Questions

What is NSN 5330-01-291-0531?

NSN 5330-01-291-0531 is a Seal,plain Encased, manufactured by Thern Inc, classified under FSC 5330, Packing and Gasket Materials. Status: active.

What part numbers are listed for NSN 5330-01-291-0531?

NSN 5330-01-291-0531 has 2 manufacturer part numbers on file: A4377 (Thern Inc), D1028 PIECE 35 (Thern Inc).

Is NSN 5330-01-291-0531 hazardous material?

Possible hazard — SDS may be required (DLA HMIC P). 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.

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

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