The Brick Architect

Technic Ball Joint with Square Hole (Part 1938)

2022

Custom LEGO part images © 2014-2026 Brick Architect LLC.

External Links

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

LEGO Pick a Brick:

1938 SWASH PLATE BALL, NO. 1

Bricklink:

1938 Technic Ball Joint Swashplate with 4 Grooves and Square Hole

Rebrickable:

1938 Technic Ball Joint with Square Hole

Brickset:

1938 SWASH PLATE BALL, NO. 1

LDraw:

1938 Technic Swashplate Ball Joint with 4 Grooves and Square Hole

CURRENTALL YEARS

OVERALL RANK

# PIECES

# SETS

# COLORS

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 2021-2025. (2026 not included because too few sets have been released and inventoried at this time.)

Printable LEGO Brick Label

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

Technic Ball Joint
with Square Hole
1938

Preliminary Label: Part name may be inconsistent since this part has not been added to LEGO Parts Guide yet. (You may want to edit part name before printing.)

This part has not been added to The LEGO Parts Guide yet, so you will not find it in the galleries sorted by category.

This page was generated using data from Rebrickable, BrickLink, Brickset, and LDraw.

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. © 2026 Brick Architect LLC.
Content and design by Tom Alphin. Use of this content without permission is prohibited.
brickarchitect.com

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.