Retainer, Seat, Valve4820-01-654-3700

NSN 4820-01-654-3700 · NIIN 016543700 · Part number BV-1256

Gross Mechanical Laboratories Inc · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 72922

Government record, cited

NSN 4820-01-654-3700 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-654-3700. Manufacturer of record part number: BV-1256.

Also searched as 4820-01-654-3700 · 4820016543700 · NIIN 016543700 · 01-654-3700 · FSC 4820 Valves, Nonpowered · CAGE 72922 · BV-1256

Nearby stock numbers ← 4820-01-654-3699 Valve, Ball · 4820-01-654-3704 Ball, Valve, Ported →

4820-01-654-3700 — Valves, Nonpowered

Features

Retainer,seat,valve — FSC 4820
Outside Diameter: 1.80 INCHES NOMINAL IN
Inside Diameter: 1.30 INCHES NOMINAL IN
Material: PLASTIC
1 manufacturer part number on file
Manufacturer of record: Gross Mechanical Laboratories Inc

Identification

NSN: 4820-01-654-3700
NIIN: 016543700
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: BV-1256
Manufacturer: Gross Mechanical Laboratories Inc

General Description

The Retainer,seat,valve, cataloged under National Stock Number 4820-01-654-3700, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Gross Mechanical Laboratories Inc. Government technical data includes 3 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. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-654-3700
Primary Part Number	BV-1256
Item Name	Retainer,seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Gross Mechanical Laboratories Inc
Status	ACTIVE
Outside Diameter	1.80 INCHES NOMINAL IN
Inside Diameter	1.30 INCHES NOMINAL IN
Material	PLASTIC

Lifecycle & Compliance

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

Cross-Reference Index

Part Number	Manufacturer
BV-1256 PRIMARY	Gross Mechanical Laboratories Inc (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 4820-01-654-3700?

NSN 4820-01-654-3700 is a Retainer,seat,valve, manufactured by Gross Mechanical Laboratories Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-654-3700?

NSN 4820-01-654-3700 has 1 manufacturer part number on file: BV-1256 (Gross Mechanical Laboratories Inc).

What are the specifications of BV-1256?

Key specifications for BV-1256: Outside Diameter: 1.80 INCHES NOMINAL IN; Inside Diameter: 1.30 INCHES NOMINAL IN; Material: PLASTIC. 3 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-654-3700 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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