PartsTable TECHNICAL DATA SHEET

NSN 4820-01-135-3897Government record, cited

Seat, Valve4820-01-135-3897

NSN 4820-01-135-3897 · NIIN 011353897

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-135-3897 · 4820011353897 · NIIN 011353897 · 01-135-3897 · FSC 4820 Valves, Nonpowered · 2640-402X3 PIECE 29 · 845-2050947 PIECE 29 · 845-2050947 · 2640-402X3 · 1H0000LLCF05761

Nearby stock numbers ← 4820-01-135-3893 Piston Liner, Valve · 4820-01-135-3898 Valve, Flow Control →

4820-01-135-3897 — Valves, Nonpowered

Features

Seat,valve — FSC 4820
Body Outside Diameter: 1.453 INCHES NOMINAL IN
Body Stepped Inside Diameter: 1.000 INCHES NOMINAL FIRST STEP IN
Body Stepped Inside Diameter: 1.062 INCHES NOMINAL SECOND STEP IN
Style Designator: PLAIN
Material: STEEL COMP 304 OVERALL
Seating Surface Shape: FLAT

Identification

NSN: 4820-01-135-3897
NIIN: 011353897
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-135-3897, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government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	4820-01-135-3897
Item Name	Seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Body Outside Diameter	1.453 INCHES NOMINAL IN
Body Stepped Inside Diameter	1.000 INCHES NOMINAL FIRST STEP IN
Body Stepped Inside Diameter	1.062 INCHES NOMINAL SECOND STEP IN
Style Designator	PLAIN
Material	STEEL COMP 304 OVERALL
Seating Surface Shape	FLAT

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 7

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

4820-01-135-54922640-402X3 PIECE 2,5 POSSIBLE MATCH

PARTS KIT,BALL VALVE

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

4820-01-135-68602640-402X3 PIECE 30 POSSIBLE MATCH

RETAINER,DISK,VALVE

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

4820-01-136-08512640-402X3 PIECE 28 POSSIBLE MATCH

STEM,FLUID VALVE

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

4820-01-136-24882640-402X3 PIECE 27 POSSIBLE MATCH

STEM,FLUID VALVE

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

4820-01-141-25822640-402X3 PIECE 26 POSSIBLE MATCH

STEM,FLUID VALVE

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

4820-01-145-55892640-402X3 PIECE 1,4 POSSIBLE MATCH

PARTS KIT,BALL VALVE

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

4820-01-220-83042640-402X3 POSSIBLE MATCH

PARTS KIT,BALL VALVE

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

Cross-Reference Index

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

Reference documents

Reference	Meaning
2640-402X3 PIECE 29	3/2 Design control — primary reference U.S. Government activity
845-2050947 PIECE 29	3/2 Design control — primary reference U.S. Government activity
845-2050947	D/9 Drawing number reference only U.S. Government activity
2640-402X3	D/9 Drawing number reference only U.S. Government activity
1H0000LLCF05761	C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity

Related Parts

4820-01-135-5492POSSIBLE MATCH

PARTS KIT,BALL VALVE

2640-402X3 PIECE 2,5

4820-01-135-6860POSSIBLE MATCH

RETAINER,DISK,VALVE

2640-402X3 PIECE 30

4820-01-136-0851POSSIBLE MATCH

STEM,FLUID VALVE

2640-402X3 PIECE 28

4820-01-136-2488POSSIBLE MATCH

STEM,FLUID VALVE

2640-402X3 PIECE 27

4820-01-141-2582POSSIBLE MATCH

STEM,FLUID VALVE

2640-402X3 PIECE 26

4820-01-145-5589POSSIBLE MATCH

PARTS KIT,BALL VALVE

2640-402X3 PIECE 1,4

4820-01-220-8304POSSIBLE MATCH

PARTS KIT,BALL VALVE

2640-402X3

Frequently Asked Questions

What is NSN 4820-01-135-3897?

NSN 4820-01-135-3897 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-01-135-3897?

7 possible matches (shared part number, not a government interchangeability claim): 4820-01-135-5492, 4820-01-135-6860, 4820-01-136-0851. Verify interchangeability with system specifications before substitution.

What are the specifications of 4820-01-135-3897?

Key specifications for 4820-01-135-3897: Overall Height: 0.234 INCHES NOMINAL IN; Body Outside Diameter: 1.453 INCHES NOMINAL IN; Body Stepped Inside Diameter: 1.000 INCHES NOMINAL FIRST STEP IN; Body Stepped Inside Diameter: 1.062 INCHES NOMINAL SECOND STEP IN. 6 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-135-3897 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.

PartsTable Design LLC · partstable.com