← The LEGO Parts Guide › Technic › Gears

40 Tooth (Part 3649)

1977-2025CURRENT

Custom LEGO part image © 2025 Tom Alphin / Brick Architect.

External Links

LEGO parts are described differently on other websites and may use different part numbers.

LEGO Pick a Brick:
34432 GEAR WHEEL 40T
Bricklink:
3649 Technic, Gear 40 Tooth
Rebrickable:
3649 Technic Gear 40 Tooth
Brickset:
34432 GEAR WHEEL 40T
3649 GEAR WHEEL 40T
LDraw:
3649 Technic Gear 40 Tooth
 CURRENTALL YEARS
OVERALL RANK
-267
1868
796
# PIECES
19(RANK: 1655)
510(RANK: 736)
# SETS
8(RANK: 1779)
163(RANK: 831)
# COLORS
1(RANK: 2401)
9(RANK: 1147)

Ranking based on buying one copy of every LEGO set, counting the number of sets containing each part, then sorting by part and color.

Overall Rank is a weighted score combining the number of parts, sets, and colors produced.

Current ranking based on sets released between 2020-2024. (2025 not included because too few sets have been released and inventoried at this time.)

Printable LEGO Brick Label

40 Tooth
3649
.LBX

Requires a compatible Brother Label Printer — learn more at brickarchitect.com/labels.

A label for this part is included in the legacy LEGO Brick Labels collection.

Date Added: 2024-02-21 12:00:00

Subscribe for updates!

Join thousands of LEGO fans by subscribing to our monthly newsletter. It contains updates to the LEGO Parts Guide, exclusive subscriber content, and a roundup of the best LEGO news from around the web.

I give Brick Architect consent to send email using the information provided in this form.

What to expect: Brick Architect is committed to respecting your personal data and privacy, in accordance with our Privacy Policy. Please feel free to unsubscribe at any time using the link at the bottom of every email we send.

The LEGO Parts Guide is a work in progress

This is a handcrafted experience to help you browse LEGO parts in a simpler way. If you have ideas to make it better or encounter any issues, please send me an email at tom@tomalphin.com — Thanks!

Check out the About the LEGO Parts Guide page to learn more about why I created this guide. It also includes a detailed version history with images of early prototypes of this guide.


Support the LEGO Parts Guide

The LEGO Parts Guide is an extension of my LEGO Brick Labels project. If you want to support this project and gain access to behind-the-scenes updates, consider supporting the project at patreon.com.

The LEGO Parts Guide © 2025 Tom Alphin / Brick Architect.

Brick Architect earns a commission from qualifying purchases at partner sites such as LEGO.com and Amazon. (For a complete list of affiliate programs, visit About Brick Architect.)

LEGO® is a trademark of the LEGO Group which does not sponsor, authorize or endorse this site. As a member of the Recognized LEGO® Fan Media program, we abide by the LEGO Fair Play and Novelty policies by not sharing leaked photos of unreleased sets.

This guide uses external data from Rebrickable, BrickLink, Brickset, and LDraw.