PartsTable TECHNICAL DATA SHEET

NSN 2825-01-168-3650Government record, cited

Piston, Steam Seal2825-01-168-3650

NSN 2825-01-168-3650 · NIIN 011683650 · Part number M1802HB

Siemens Energy, Inc. · FSC 2825 — Steam Turbines and Components · FSG 28 — Engines, Turbines, and Components · CAGE 16712

Government record, cited

NSN 2825-01-168-3650 — this item is cataloged by the U.S. Government under National Stock Number 2825-01-168-3650. Manufacturer of record part number: M1802HB.

Also searched as 2825-01-168-3650 · 2825011683650 · NIIN 011683650 · 01-168-3650 · FSC 2825 Steam Turbines and Components · CAGE 16712 · M1802HB · F7757 · F7757 PIECE 47

Nearby stock numbers ← 2825-01-168-3469 Shield Pump Lower, S · 2825-01-168-3651 →

Features

Piston,steam Seal — FSC 2825
2 manufacturer part numbers on file
Manufacturer of record: Siemens Energy, Inc.

Identification

NSN: 2825-01-168-3650
NIIN: 011683650
FSC: 2825 — Steam Turbines and Components
FSG: 28 — Engines, Turbines, and Components
Primary part number: M1802HB
Manufacturer: Siemens Energy, Inc.

General Description

The Piston,steam Seal, cataloged under National Stock Number 2825-01-168-3650, is classified within Federal Supply Class 2825 (Steam Turbines and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Siemens Energy, Inc.. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 12 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.

Catalog Facts

Item Name	Piston,steam Seal
FSC / FSG	2825 — Steam Turbines and Components (FSG 28)
Manufacturers	Siemens Energy, Inc. (CAGE 16712)

Technical Specifications

Parameter	Value
NSN	2825-01-168-3650
Primary Part Number	M1802HB
Item Name	Piston,steam Seal
FSC / FSG	2825 / 28 — Steam Turbines and Components
Manufacturer	Siemens Energy, Inc.
Status	ACTIVE

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 12

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

2825-01-168-3652M370X1 POSSIBLE MATCH

ADAPTER

Possible match (shared part number)Siemens Energy, Inc.

2825-01-168-3653F7757 PIECE 51 POSSIBLE MATCH

COVER,STEAM SEAL

Possible match (shared part number)Siemens Energy, Inc.

5342-01-168-3654F7757 PIECE 52 POSSIBLE MATCH

BRACKET

Possible match (shared part number)Siemens Energy, Inc.

2825-01-168-4343M1841BB POSSIBLE MATCH

FORK,STEAM SEAL REGULATOR

Possible match (shared part number)Siemens Energy, Inc.

2825-01-168-4344M549WG POSSIBLE MATCH

COVER,STEAM SEAL REGULATOR

Possible match (shared part number)Siemens Energy, Inc.

2825-01-168-4345M1841AV POSSIBLE MATCH

FORK,STEAM SEAL REGULATOR

Possible match (shared part number)Siemens Energy, Inc.

2825-01-168-4347F7757 PIECE 153 POSSIBLE MATCH

SOCKET,VALVE

Possible match (shared part number)Siemens Energy, Inc.

5365-01-168-6436M215NV POSSIBLE MATCH

BUSHING

Possible match (shared part number)Siemens Energy, Inc.

4820-01-168-6437F7757 PIECE 28 POSSIBLE MATCH

COVER,STEAM SEAL REAR

Possible match (shared part number)Siemens Energy, Inc.

4820-01-168-7616M225AE POSSIBLE MATCH

DISK,VALVE

Possible match (shared part number)Siemens Energy, Inc.

Cross-Reference Index

Part Number	Manufacturer
M1802HB PRIMARY	Siemens Energy, Inc. (USA)
F7757 PIECE 47	Siemens Energy, Inc. (USA)

Reference documents

Reference	Meaning
F7757	D/9 Drawing number reference only Siemens Energy, Inc.

Related Parts

2825-01-168-3652POSSIBLE MATCH

ADAPTER

M370X1

2825-01-168-3653POSSIBLE MATCH

COVER,STEAM SEAL

F7757 PIECE 51

5342-01-168-3654POSSIBLE MATCH

BRACKET

F7757 PIECE 52

2825-01-168-4343POSSIBLE MATCH

FORK,STEAM SEAL REGULATOR

M1841BB

2825-01-168-4344POSSIBLE MATCH

COVER,STEAM SEAL REGULATOR

M549WG

2825-01-168-4345POSSIBLE MATCH

FORK,STEAM SEAL REGULATOR

M1841AV

2825-01-168-4347POSSIBLE MATCH

SOCKET,VALVE

F7757 PIECE 153

5365-01-168-6436POSSIBLE MATCH

BUSHING

M215NV

4820-01-168-6437POSSIBLE MATCH

COVER,STEAM SEAL REAR

F7757 PIECE 28

4820-01-168-7616POSSIBLE MATCH

DISK,VALVE

M225AE

2825-01-170-2486POSSIBLE MATCH

PILOT VALVE AND SLEEVE ASSEMBLY

M-1822KD

2825-01-170-2487POSSIBLE MATCH

BELLOWS,STEAM TURBINE

M-738AC

Frequently Asked Questions

What is NSN 2825-01-168-3650?

NSN 2825-01-168-3650 is a Piston,steam Seal, manufactured by Siemens Energy, Inc., classified under FSC 2825, Steam Turbines and Components. Status: active.

What part numbers are listed for NSN 2825-01-168-3650?

NSN 2825-01-168-3650 has 2 manufacturer part numbers on file: M1802HB (Siemens Energy, Inc.), F7757 PIECE 47 (Siemens Energy, Inc.).

What NSN replaces 2825-01-168-3650?

12 possible matches (shared part number, not a government interchangeability claim): 2825-01-168-3652, 2825-01-168-3653, 5342-01-168-3654. Verify interchangeability with system specifications before substitution.

Is NSN 2825-01-168-3650 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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