Step Parts

When you need real CAD geometry for standard hardware instead of modeling yet another M3 screw from scratch, this skill hits the step.parts API to search, filter, and download STEP files for bolts, bearings, connectors, and thousands of other catalog parts. It handles fuzzy search across standards like ISO 4762, resolves ambiguous queries by showing you the top matches with dimensions and attributes, then verifies SHA256 checksums on download. The bundled Python script can pull individual parts or batch downloads, and the API reference covers faceted search, family specific attributes, and discovery endpoints. Honest take: this is a time saver if you work in mechanical CAD and want verified geometry instead of hunting manufacturer sites or guessing thread pitches.

GitHub stars: 257
last updated: May 29, 2026

View on GitHub

Install

$ npx -y skills add earthtojake/step.parts --skill step-parts --agent claude-code

Installs into .claude/skills of the current project.

Files

CAD Parts

Overview

Use the hosted step.parts machine endpoints instead of scraping HTML or relying on local repository files. Treat https://api.step.parts as the canonical API origin and https://www.step.parts as the site/static-asset origin unless the user provides a different hosted mirror. If the domain does not resolve or the API is unavailable, report that the hosted service is not reachable yet instead of falling back to repo-specific assumptions.