Diaphragm, Valve, Flat4820-00-421-3858

NSN 4820-00-421-3858 · NIIN 004213858

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-00-421-3858 · 4820004213858 · NIIN 004213858 · 00-421-3858 · FSC 4820 Valves, Nonpowered · 31904 · 31904G

Nearby stock numbers ← 4820-00-421-3842 Valve, Safety Relief · 4820-00-421-3859 Disk, Valve →

4820-00-421-3858 — Valves, Nonpowered

Features

Diaphragm,valve,flat — FSC 4820
Outside Diameter: 3.125 INCHES NOMINAL IN
Style Designator: FLAT
Material Thickness: 0.075 INCHES NOMINAL IN
Bolt Hole Quantity: 8
Bolt Circle Diameter: 2.688 INCHES NOMINAL IN
Center Hole Diameter: 0.250 INCHES NOMINAL IN
Material: RUBBER SYNTHETIC

Identification

NSN: 4820-00-421-3858
NIIN: 004213858
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Diaphragm,valve,flat, cataloged under National Stock Number 4820-00-421-3858, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-00-421-3858
Item Name	Diaphragm,valve,flat
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Outside Diameter	3.125 INCHES NOMINAL IN
Style Designator	FLAT
Material Thickness	0.075 INCHES NOMINAL IN
Bolt Hole Quantity	8
Bolt Circle Diameter	2.688 INCHES NOMINAL IN
Center Hole Diameter	0.250 INCHES NOMINAL IN
Material	RUBBER SYNTHETIC
Hole Diameter	0.175 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

⇄ Related Items 2

Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.

5310-01-063-897331904 POSSIBLE MATCH

WASHER,FLAT

Possible match (shared part number)Jergens Inc Div Tooling Components Division

6515-01-213-2661319.04 POSSIBLE MATCH

GAGE,DEPTH,BONE SCREW

Possible match (shared part number)Depuy Synthes Sales Inc Dba Depuy Synthes Trauma Div Depuy Synthes Sales, Inc., D/b/a Depuy Synthes Trauma

Cross-Reference Index

No manufacturer part numbers on file in the U.S. Government catalog.

Reference documents

Reference	Meaning
31904	5/9 Secondary reference U.S. Government activity
31904G	3/2 Design control — primary reference U.S. Government activity

Related Parts

5310-01-063-8973POSSIBLE MATCH

WASHER,FLAT

31904

6515-01-213-2661POSSIBLE MATCH

GAGE,DEPTH,BONE SCREW

319.04

Frequently Asked Questions

What is NSN 4820-00-421-3858?

NSN 4820-00-421-3858 is a Diaphragm,valve,flat, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-00-421-3858?

2 possible matches (shared part number, not a government interchangeability claim): 5310-01-063-8973, 6515-01-213-2661. Verify interchangeability with system specifications before substitution.

What are the specifications of 4820-00-421-3858?

Key specifications for 4820-00-421-3858: Outside Diameter: 3.125 INCHES NOMINAL IN; Style Designator: FLAT; Material Thickness: 0.075 INCHES NOMINAL IN; Bolt Hole Quantity: 8. 8 specifications are documented in the U.S. Government catalog.

Is NSN 4820-00-421-3858 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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