PartsTable TECHNICAL DATA SHEET

NSN 4820-01-421-2139Government record, cited

Parts Kit, Ball Valve4820-01-421-2139

NSN 4820-01-421-2139 · NIIN 014212139 · Part number SS-11A-3N

Swagelok Co · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 3T9T9

Government record, cited

NSN 4820-01-421-2139 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-421-2139. Manufacturer of record part number: SS-11A-3N.

Also searched as 4820-01-421-2139 · 4820014212139 · NIIN 014212139 · 01-421-2139 · FSC 4820 Valves, Nonpowered · CAGE 3T9T9 · SS-11A-3N

Nearby stock numbers ← 4820-01-421-2138 Valve, Ball · 4820-01-421-2140 Parts Kit, Ball Valve →

4820-01-421-2139 — Valves, Nonpowered

Features

Parts Kit,ball Valve — FSC 4820
Criticality Code Justification: FEAT
End Item Name: MK 3 MOD 0 LIGHT WEIGHT DIVE SYS
1 manufacturer part number on file
Manufacturer of record: Swagelok Co

Identification

NSN: 4820-01-421-2139
NIIN: 014212139
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: SS-11A-3N
Manufacturer: Swagelok Co

General Description

The Parts Kit,ball Valve, cataloged under National Stock Number 4820-01-421-2139, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Swagelok Co. Government technical data includes 2 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-421-2139
Primary Part Number	SS-11A-3N
Item Name	Parts Kit,ball Valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Swagelok Co
Status	ACTIVE
Criticality Code Justification	FEAT
End Item Name	MK 3 MOD 0 LIGHT WEIGHT DIVE SYS

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	Y

Cross-Reference Index

Part Number	Manufacturer
SS-11A-3N PRIMARY	Swagelok Co (USA)

Reference documents

Reference	Meaning
SS-11A-3N	5/9 Secondary reference Whitey Co

No interchangeability data on file.

Other items in FSC 4820 — Valves, Nonpowered

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

4820-00-000-0097

4820-00-000-0097 · Item name not on file

4820-00-001-0010

VALVE,ROTARY,SELECTOR

4820-00-001-0020

4820-00-001-0020 · Item name not on file

4820-00-001-0021

4820-00-001-0021 · Item name not on file

4820-00-001-0032

4820-00-001-0032 · Item name not on file

4820-00-001-0037

VALVE,SAFETY RELIEF

4820-00-001-0042

4820-00-001-0042 · Item name not on file

4820-00-001-1230

4820-00-001-1230 · Item name not on file

Frequently Asked Questions

What is NSN 4820-01-421-2139?

NSN 4820-01-421-2139 is a Parts Kit,ball Valve, manufactured by Swagelok Co, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-421-2139?

NSN 4820-01-421-2139 has 1 manufacturer part number on file: SS-11A-3N (Swagelok Co).

What are the specifications of SS-11A-3N?

Key specifications for SS-11A-3N: Criticality Code Justification: FEAT; End Item Name: MK 3 MOD 0 LIGHT WEIGHT DIVE SYS; Special Features: UNDERWATER LIFE SUPPORT IAW NAVSEA INSTRUCTION 10560.2B. 2 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-421-2139 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.

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

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