PartsTable TECHNICAL DATA SHEET

NSN 3020-01-149-5050Government record, cited

Gear, Spur3020-01-149-5050

NSN 3020-01-149-5050 · NIIN 011495050

FSC 3020 — Gears, Pulleys, Sprockets, and Transmission Chain · FSG 30 — Mechanical Power Transmission Equipment

Government record, cited

Also searched as 3020-01-149-5050 · 3020011495050 · NIIN 011495050 · 01-149-5050 · FSC 3020 Gears, Pulleys, Sprockets, and Transmission Chain · 77643-93X3 · SSN637-501-2143837 · 2143837 · 77643-93X3 PIECE 4 · SSN637-501-2143837 PIECE 4

Nearby stock numbers ← 3020-01-149-5049 Gear, Spur · 3020-01-149-5069 Sprocket Wheel →

Features

Gear,spur — FSC 3020
Teeth Quantity: 12
Body Style: PLAIN, SOLID
Style Designator: HUBLESS
Pitch Diameter: 1.5625 INCHES NOMINAL IN
Tooth Form: SPECIAL
Nominal Outside Diameter: 1.820 INCHES IN
Pressure Angle: 20.0000 DEGREES

Identification

NSN: 3020-01-149-5050
NIIN: 011495050
FSC: 3020 — Gears, Pulleys, Sprockets, and Transmission Chain
FSG: 30 — Mechanical Power Transmission Equipment

General Description

The Gear,spur, cataloged under National Stock Number 3020-01-149-5050, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government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	3020-01-149-5050
Item Name	Gear,spur
FSC / FSG	3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain
Status	ACTIVE
Teeth Quantity	12
Body Style	PLAIN, SOLID
Style Designator	HUBLESS
Pitch Diameter	1.5625 INCHES NOMINAL IN
Tooth Form	SPECIAL
Nominal Outside Diameter	1.820 INCHES IN
Pressure Angle	20.0000 DEGREES
Face Nominal Width	1.125 INCHES 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 7

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

3020-01-149-6764SSN637-501-2143837 PIECE 8 POSSIBLE MATCH

GEAR,BEVEL

Possible match (shared part number)Naval Ship Systems Command

3040-01-150-177077643-93X3 REV E PIECES 2 & 3 POSSIBLE MATCH

CONNECTING LINK,RIGID

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

4810-01-151-383477643-93X3 PIECE 1 POSSIBLE MATCH

CRANKSHAFT,EXHAUST VALVE

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

3020-01-151-6007SSN637-501-2143837 PIECE 10 POSSIBLE MATCH

GEAR,BEVEL

Possible match (shared part number)Naval Ship Systems Command

4820-01-151-802777643-93X3PC19 POSSIBLE MATCH

CAP,VALVE

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

3040-01-152-271177643-93X3PC5 POSSIBLE MATCH

SHAFT,SHOULDERED

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

4730-01-189-659477643-93X3 PIECE 6 POSSIBLE MATCH

BOLT,FLUID PASSAGE

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
77643-93X3	D/9 Drawing number reference only U.S. Government activity
SSN637-501-2143837	D/9 Drawing number reference only U.S. Government activity
2143837	D/9 Drawing number reference only U.S. Government activity
77643-93X3 PIECE 4	5/2 Secondary reference U.S. Government activity
SSN637-501-2143837 PIECE 4	3/2 Design control — primary reference U.S. Government activity

Related Parts

3020-01-149-6764POSSIBLE MATCH

GEAR,BEVEL

SSN637-501-2143837 PIECE 8

3040-01-150-1770POSSIBLE MATCH

CONNECTING LINK,RIGID

77643-93X3 REV E PIECES 2 & 3

4810-01-151-3834POSSIBLE MATCH

CRANKSHAFT,EXHAUST VALVE

77643-93X3 PIECE 1

3020-01-151-6007POSSIBLE MATCH

GEAR,BEVEL

SSN637-501-2143837 PIECE 10

4820-01-151-8027POSSIBLE MATCH

CAP,VALVE

77643-93X3PC19

3040-01-152-2711POSSIBLE MATCH

SHAFT,SHOULDERED

77643-93X3PC5

4730-01-189-6594POSSIBLE MATCH

BOLT,FLUID PASSAGE

77643-93X3 PIECE 6

Frequently Asked Questions

What is NSN 3020-01-149-5050?

NSN 3020-01-149-5050 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.

What NSN replaces 3020-01-149-5050?

7 possible matches (shared part number, not a government interchangeability claim): 3020-01-149-6764, 3040-01-150-1770, 4810-01-151-3834. Verify interchangeability with system specifications before substitution.

What are the specifications of 3020-01-149-5050?

Key specifications for 3020-01-149-5050: Teeth Quantity: 12; Body Style: PLAIN, SOLID; Style Designator: HUBLESS; Pitch Diameter: 1.5625 INCHES NOMINAL IN. 8 specifications are documented in the U.S. Government catalog.

Is NSN 3020-01-149-5050 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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