Iso 4156-1 Pdf Jun 2026

: Detailed tables for specific module sizes and tooth counts [2].

The standard contains dozens of critical tables (e.g., fundamental deviations, tolerance grades) and complex geometric figures. In unofficial copies, these are often scanned poorly, have OCR errors, or are missing entirely. A single misread number (e.g., a tolerance of 0.025 mm instead of 0.250 mm) can scrap thousands of dollars worth of parts. iso 4156-1 pdf

ISO 4156-1:2021 is not just a collection of dry technical pages. It is a precision instrument for communication between design, manufacturing, and quality assurance. An engineer in Japan can specify a "4H/5f" spline, and a machinist in Brazil can produce it correctly—because both have access to the same official PDF. : Detailed tables for specific module sizes and

The heart of the document is the massive data tables. For a given nominal size (e.g., module 2 mm, 30 teeth), the PDF provides: A single misread number (e

If you work for an OEM (e.g., Bosch, Siemens, Caterpillar), your internal document management system likely hosts a licensed copy. Check with your engineering librarian or quality manager.

But for a spline to work efficiently—without backlash, stress fractures, or premature wear—it must be manufactured to exacting standards. That standard is , titled "Straight cylindrical involute splines — Metric module, side fit — Part 1: Generalities and definitions."