PartsTable TECHNICAL DATA SHEET

NSN 4820-01-181-1853Government record, cited

Diaphragm, Valve, Flat4820-01-181-1853

NSN 4820-01-181-1853 · NIIN 011811853 · Part number P12602142

Fairbanks Morse, Llc · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 7PZX0

Government record, cited

NSN 4820-01-181-1853 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-181-1853. Manufacturer of record part number: P12602142.

Also searched as 4820-01-181-1853 · 4820011811853 · NIIN 011811853 · 01-181-1853 · FSC 4820 Valves, Nonpowered · CAGE 7PZX0 · P12602142

Nearby stock numbers ← 4820-01-181-1852 Disk, Valve · 4820-01-181-1854 Disk, Valve →

4820-01-181-1853 — Valves, Nonpowered

Features

Diaphragm,valve,flat — FSC 4820
Outside Diameter: 8.658 INCHES MINIMUM AND 8.660 INCHES MAXIMUM IN
Style Designator: FLAT
Material Thickness: 1.000 INCHES NOMINAL IN
Bolt Hole Quantity: 2
Bolt Circle Diameter: 3.380 INCHES NOMINAL IN
Material: STEEL
Hole Diameter: 0.500 INCHES NOMINAL IN

Identification

NSN: 4820-01-181-1853
NIIN: 011811853
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: P12602142
Manufacturer: Fairbanks Morse, Llc

General Description

The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-181-1853, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Fairbanks Morse, Llc. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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	4820-01-181-1853
Primary Part Number	P12602142
Item Name	Diaphragm,valve,flat
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Fairbanks Morse, Llc
Status	ACTIVE
Outside Diameter	8.658 INCHES MINIMUM AND 8.660 INCHES MAXIMUM IN
Style Designator	FLAT
Material Thickness	1.000 INCHES NOMINAL IN
Bolt Hole Quantity	2
Bolt Circle Diameter	3.380 INCHES NOMINAL IN
Material	STEEL
Hole Diameter	0.500 INCHES NOMINAL IN

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
P12602142 PRIMARY	Fairbanks Morse, Llc (USA)

Reference documents

Reference	Meaning
P12602142	3/9 Design control — primary reference U.S. Government activity

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 4820-01-181-1853?

NSN 4820-01-181-1853 is a Diaphragm,valve,flat, manufactured by Fairbanks Morse, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-181-1853?

NSN 4820-01-181-1853 has 1 manufacturer part number on file: P12602142 (Fairbanks Morse, Llc).

What are the specifications of P12602142?

Key specifications for P12602142: Outside Diameter: 8.658 INCHES MINIMUM AND 8.660 INCHES MAXIMUM IN; Style Designator: FLAT; Material Thickness: 1.000 INCHES NOMINAL IN; Bolt Hole Quantity: 2. 7 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-181-1853 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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