PartsTable TECHNICAL DATA SHEET

NSN 4820-01-556-0495Government record, cited

Valve, Vent4820-01-556-0495

NSN 4820-01-556-0495 · NIIN 015560495 · Part number HM020-117-21

Robertson Fuel Systems, L.l.c. · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 1T765

Government record, cited

NSN 4820-01-556-0495 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-556-0495. Manufacturer of record part number: HM020-117-21.

Also searched as 4820-01-556-0495 · 4820015560495 · NIIN 015560495 · 01-556-0495 · FSC 4820 Valves, Nonpowered · CAGE 1T765 · HM020-117-21

Nearby stock numbers ← 4820-01-556-0469 Piston, Valve · 4820-01-556-0500 Valve, Ball →

4820-01-556-0495 — Valves, Nonpowered

Features

Valve,vent — FSC 4820
1 manufacturer part number on file
Manufacturer of record: Robertson Fuel Systems, L.l.c.

Identification

NSN: 4820-01-556-0495
NIIN: 015560495
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: HM020-117-21
Manufacturer: Robertson Fuel Systems, L.l.c.

General Description

The Valve,vent, cataloged under National Stock Number 4820-01-556-0495, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Robertson Fuel Systems, L.l.c.. 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

Parameter	Value
NSN	4820-01-556-0495
Primary Part Number	HM020-117-21
Item Name	Valve,vent
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Robertson Fuel Systems, L.l.c.
Status	ACTIVE

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL Q — CCL Item — Commerce Control List
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
HM020-117-21 PRIMARY	Robertson Fuel Systems, L.l.c. (USA)

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 4820-01-556-0495?

NSN 4820-01-556-0495 is a Valve,vent, manufactured by Robertson Fuel Systems, L.l.c., classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-556-0495?

NSN 4820-01-556-0495 has 1 manufacturer part number on file: HM020-117-21 (Robertson Fuel Systems, L.l.c.).

What are the specifications of HM020-117-21?

Key specifications for HM020-117-21: Special Features: INCLUDES VENT VALVE (2750088-103), O-RING (MS29513-230 AND MS29513-150), SIX WASHERS (NAS1149D0516J), SIX BOLTS (AN5-4A), FITTING (HM020-103-3), NUT (HM022-23), ADAPTER (HM020-150); USED ON INTERNAL AUXILIARY FUEL TRANSFER SYSTEM (IAFTS) FOR 1520-01-035-0266 AND 1520-01-298-4532 A; Part Name Assigned by Controlling Agency: VALVE ASSEMBLY,VENT; End Item Identification: UH-60 BLACKHAWK HELICOPTER. 0 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-556-0495 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.

What is the DEMIL code for NSN 4820-01-556-0495?

NSN 4820-01-556-0495 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.

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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