About Fasteners Standards

Dedicated to precision engineering, CNC machining accuracy, and reliable fastener thread geometry reference.

Our Mission & Purpose

In modern precision manufacturing, a fraction of a millimeter or thousandth of an inch is the difference between a high-reliability assembly and scrapped aerospace hardware. For decades, mechanical engineers, draftspersons, and CNC machinists have had to navigate dense, fragmented, and disparate physical standards handbooks to determine critical pitch diameter limits, fundamental deviations, crest truncation formulas, and tap drill engagements.

Fasteners Standards was established to bridge this gap. We provide an interactive, rigorous, and automated engineering computational platform that turns static standards tables into dynamic, verifiable, and visually explicit geometric data.

Exact Standards

Direct mathematical replication of ISO 68-1, ISO 261, ISO 965-1/2, ASME B1.1, ASME B1.5, and ASME B1.8 specifications.

CAD Automation

Pre-configured SolidWorks Library Feature Parts (.SLDLFP), VBA API macros, and AI physical material generators.

Verified Algorithms

Server and client computation validated across 1,800+ standard thread size and tolerance class permutations.

Standards We Cover

Our calculators and databases are engineered around authoritative global specifications:

ISO 68-1 & ISO 261 (Metric General Purpose)Coarse and fine metric pitches from M1 through M100+ with 60° nominal flank angle.
ISO 965-1 & ISO 965-2 (Metric Tolerances)Tolerance positions e, f, g, h (external) and G, H (internal) across grades 4 to 8.
ASME B1.1 (Unified Inch Screw Threads)UNC, UNF, UNEF, and UN constant pitch series across Class 1A/1B, 2A/2B, and 3A/3B.
ASME B1.5 & ASME B1.8 (ACME & Stub ACME)29° power transmission threads for leadscrews, jacks, and linear motion drives.

* Note: Fasteners Standards is an independent engineering platform. All standard designations (ISO, ASME) and software trademarks (SOLIDWORKS®) remain the property of their respective governing organizations and are used strictly for reference, educational, and computational identification purposes.

Who We Build For

Fasteners Standards is engineered for:

  • CNC Machinists & Programmers: Looking up precise tap drill sizes, pitch diameter inspection limits for 3-wire measurement, and threading insert offsets.
  • Mechanical & Aerospace Engineers: Verifying fastener shear areas, tensile stress areas, and fit classifications during structural finite element analysis.
  • Quality Assurance & Metrology Inspectors: Establishing Go / No-Go thread plug and ring gauge acceptance tolerances.
  • CAD Modelers & Toolmakers: Downloading ready-to-use SolidWorks helical profiles to avoid manually sketching complex 60°/29° thread profiles.

Editorial & Engineering Inquiries

We actively update our databases as standard bodies release new revisions. If you find a data discrepancy, require an additional standard, or would like to contribute technical articles, please reach out directly:

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