PartsTable TECHNICAL DATA SHEET

NSN 3020-01-149-6771Government record, cited

Gear, Spur3020-01-149-6771

NSN 3020-01-149-6771 · NIIN 011496771

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

Government record, cited

Also searched as 3020-01-149-6771 · 3020011496771 · NIIN 011496771 · 01-149-6771 · FSC 3020 Gears, Pulleys, Sprockets, and Transmission Chain · SSN637-501-2159964 PIECE 21 · SSN637-501-2159964 · 77643-42X9 · 501-2159964 · 77643-42X9 PIECE 21

Nearby stock numbers ← 3020-01-149-6770 Gear, Spur · 3020-01-149-6789 Pulley, Timing Belt →

Features

Gear,spur — FSC 3020
Teeth Quantity: 21
Body Style: PLAIN, SOLID
Style Designator: PROTRUDING HUB
Pitch Diameter: 3.5000 INCHES NOMINAL IN
Tooth Form: STANDARD
Nominal Outside Diameter: 3.833 INCHES IN
Pressure Angle: 20.0000 DEGREES

Identification

NSN: 3020-01-149-6771
NIIN: 011496771
FSC: 3020 — Gears, Pulleys, Sprockets, and Transmission Chain
FSG: 30 — Mechanical Power Transmission Equipment

General Description

The Gear,spur, cataloged under National Stock Number 3020-01-149-6771, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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	3020-01-149-6771
Item Name	Gear,spur
FSC / FSG	3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain
Status	ACTIVE
Teeth Quantity	21
Body Style	PLAIN, SOLID
Style Designator	PROTRUDING HUB
Pitch Diameter	3.5000 INCHES NOMINAL IN
Tooth Form	STANDARD
Nominal Outside Diameter	3.833 INCHES IN
Pressure Angle	20.0000 DEGREES
Attachment Method	MOUNTING HOLE
Face Nominal Width	0.750 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 5

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

3040-01-150-041077643-42X9 PIECE 4 POSSIBLE MATCH

SHAFT,SHOULDERED

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

3040-01-150-041177643-42X9 PIECE 25 POSSIBLE MATCH

SHAFT,SHOULDERED

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

3040-01-150-046377643-42X9 PIECE 7 POSSIBLE MATCH

LEVER,REMOTE CONTROL

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

3020-01-152-928977643-42X9 PIECE 1 POSSIBLE MATCH

GEAR SECTOR,BEVEL

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

3040-01-156-999277643-42X9 PIECE 17 POSSIBLE MATCH

SHAFT,SHOULDERED

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
SSN637-501-2159964 PIECE 21	3/2 Design control — primary reference U.S. Government activity
SSN637-501-2159964	D/9 Drawing number reference only U.S. Government activity
77643-42X9	D/9 Drawing number reference only U.S. Government activity
501-2159964	D/9 Drawing number reference only U.S. Government activity
77643-42X9 PIECE 21	3/2 Design control — primary reference U.S. Government activity

Related Parts

3040-01-150-0410POSSIBLE MATCH

SHAFT,SHOULDERED

77643-42X9 PIECE 4

3040-01-150-0411POSSIBLE MATCH

SHAFT,SHOULDERED

77643-42X9 PIECE 25

3040-01-150-0463POSSIBLE MATCH

LEVER,REMOTE CONTROL

77643-42X9 PIECE 7

3020-01-152-9289POSSIBLE MATCH

GEAR SECTOR,BEVEL

77643-42X9 PIECE 1

3040-01-156-9992POSSIBLE MATCH

SHAFT,SHOULDERED

77643-42X9 PIECE 17

Frequently Asked Questions

What is NSN 3020-01-149-6771?

NSN 3020-01-149-6771 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.

What NSN replaces 3020-01-149-6771?

5 possible matches (shared part number, not a government interchangeability claim): 3040-01-150-0410, 3040-01-150-0411, 3040-01-150-0463. Verify interchangeability with system specifications before substitution.

What are the specifications of 3020-01-149-6771?

Key specifications for 3020-01-149-6771: Teeth Quantity: 21; Body Style: PLAIN, SOLID; Style Designator: PROTRUDING HUB; Pitch Diameter: 3.5000 INCHES NOMINAL IN. 9 specifications are documented in the U.S. Government catalog.

Is NSN 3020-01-149-6771 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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