PartsTable TECHNICAL DATA SHEET

JULY 2026Technical Data Sheet

C-3431 ITEM 29Seat,valve

Name: C-3431 ITEM 29
SKU: 4820-01-278-1029

Leslie Controls, Inc. Dba Leslie Controls Inc · NSN 4820-01-278-1029 · FSC 4820 · No Item Name Available

Verified by PartsTable

NSN 4820-01-278-1029 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-278-1029. Primary manufacturer part number: C-3431 ITEM 29.

4820-01-278-1029 — No Item Name Available illustration

Features

Seat,valve — FSC 4820
Seating Surface Shape: FLAT
Style Designator: THREADED FLANGED
Material: COPPER ALLOY CA464 OVERALL
Seal Accommodation Type: SLEEVE
2 verified cross-references
Primary manufacturer: Leslie Controls, Inc. Dba Leslie Controls Inc

Applications

Flow control in piping systems
Pressure regulation
Steam and fluid isolation
Applications requiring Copper Alloy CA464 Overall construction

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-278-1029, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Leslie Controls, Inc. Dba Leslie Controls Inc. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-278-1029
Primary Part Number	C-3431 ITEM 29
Item Name	Seat,valve
FSC / FSG	4820 / 48 — No Item Name Available
Manufacturer	Leslie Controls, Inc. Dba Leslie Controls Inc
Status	ACTIVE
Seating Surface Shape	FLAT
Style Designator	THREADED FLANGED
Material	COPPER ALLOY CA464 OVERALL
Seal Accommodation Type	SLEEVE

Lifecycle & Compliance

Acquisition Status	ACTIVE
HAZMAT	No

⇄ Verified Substitutes 4

5985-00-296-1747C3431 INTERCHANGEABLE

Reflector,antenna

Northrop Grumman Systems Corp Dba Northrop Grumman Systems Corp

5360-00-430-8574 INTERCHANGEABLE

Spring,helical,compression

4820-01-191-2647C-3431J INTERCHANGEABLE

Adapter,valve Position Indicator

Griswold Industries Dba Cla-Val Co

4820-01-278-804021126142 INTERCHANGEABLE

Guide,valve Stem

Leslie Controls, Inc. Dba Leslie Controls Inc

Cross-Reference Index

Part Number	Manufacturer
C-3431 ITEM 29 PRIMARY	Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
C-3431	Leslie Controls, Inc. Dba Leslie Controls Inc (USA)

Related Parts

5985-00-296-1747INTERCHANGEABLE

REFLECTOR,ANTENNA

C3431

5360-00-430-8574INTERCHANGEABLE

SPRING,HELICAL,COMPRESSION

4820-01-191-2647INTERCHANGEABLE

ADAPTER,VALVE POSITION INDICATOR

C-3431J

4820-01-278-8040INTERCHANGEABLE

GUIDE,VALVE STEM

21126142

Frequently Asked Questions

What is NSN 4820-01-278-1029?

NSN 4820-01-278-1029 is a Seat,valve, manufactured by Leslie Controls, Inc. Dba Leslie Controls Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-278-1029?

NSN 4820-01-278-1029 has 2 cross-referenced part numbers: C-3431 ITEM 29 (Leslie Controls, Inc. Dba Leslie Controls Inc), C-3431 (Leslie Controls, Inc. Dba Leslie Controls Inc).

What NSN replaces 4820-01-278-1029?

There are 4 known substitutes for 4820-01-278-1029: 5985-00-296-1747, 5360-00-430-8574, 4820-01-191-2647 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of C-3431 ITEM 29?

Key specifications for C-3431 ITEM 29: Seating Surface Shape: FLAT; Style Designator: THREADED FLANGED; Material: COPPER ALLOY CA464 OVERALL; Seal Accommodation Type: SLEEVE. 4 total characteristics are documented in the Federal Logistics Information System.

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.

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