PartsTable TECHNICAL DATA SHEET

NSN 2825-01-168-3653Government record, cited

Cover, Steam Seal2825-01-168-3653

NSN 2825-01-168-3653 · NIIN 011683653 · Part number F7757 PIECE 51

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

Government record, cited

NSN 2825-01-168-3653 — this item is cataloged by the U.S. Government under National Stock Number 2825-01-168-3653. Manufacturer of record part number: F7757 PIECE 51.

Also searched as 2825-01-168-3653 · 2825011683653 · NIIN 011683653 · 01-168-3653 · FSC 2825 Steam Turbines and Components · CAGE 16712 · F7757 PIECE 51 · M549WH · F7757

Nearby stock numbers ← 2825-01-168-3652 Adapter · 2825-01-168-4223 Lever →

Features

Cover,steam Seal — FSC 2825
General Characteristics Item Description: MATERIAL STEEL
2 manufacturer part numbers on file
Manufacturer of record: Siemens Energy, Inc.

Identification

NSN: 2825-01-168-3653
NIIN: 011683653
FSC: 2825 — Steam Turbines and Components
FSG: 28 — Engines, Turbines, and Components
Primary part number: F7757 PIECE 51
Manufacturer: Siemens Energy, Inc.

General Description

The Cover,steam Seal, cataloged under National Stock Number 2825-01-168-3653, 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.. Government technical data includes 1 specification, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 10 items share a part number with this NSN in the catalog (possible match — not a government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	2825-01-168-3653
Primary Part Number	F7757 PIECE 51
Item Name	Cover,steam Seal
FSC / FSG	2825 / 28 — Steam Turbines and Components
Manufacturer	Siemens Energy, Inc.
Status	ACTIVE
General Characteristics Item Description	MATERIAL STEEL

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 10

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

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.

2825-01-170-2486M-1822KD POSSIBLE MATCH

PILOT VALVE AND SLEEVE ASSEMBLY

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

2825-01-170-2487M-738AC POSSIBLE MATCH

BELLOWS,STEAM TURBINE

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

Cross-Reference Index

Part Number	Manufacturer
F7757 PIECE 51 PRIMARY	Siemens Energy, Inc. (USA)
M549WH PRIMARY	Siemens Energy, Inc. (USA)

Reference documents

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

Related Parts

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 2825-01-168-3653?

NSN 2825-01-168-3653 is a Cover,steam Seal, manufactured by Siemens Energy, Inc., classified under FSC 2825, Steam Turbines and Components. Status: active.

What part numbers are listed for NSN 2825-01-168-3653?

NSN 2825-01-168-3653 has 2 manufacturer part numbers on file: F7757 PIECE 51 (Siemens Energy, Inc.), M549WH (Siemens Energy, Inc.).

What NSN replaces 2825-01-168-3653?

10 possible matches (shared part number, not a government interchangeability claim): 5342-01-168-3654, 2825-01-168-4343, 2825-01-168-4344. Verify interchangeability with system specifications before substitution.

What are the specifications of F7757 PIECE 51?

Key specifications for F7757 PIECE 51: General Characteristics Item Description: MATERIAL STEEL. 1 specification is documented in the U.S. Government catalog.

Is NSN 2825-01-168-3653 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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