Precision Engineering for
& Machining Accuracy
A comprehensive technical hub for engineers, machinists, and designers. Compare standards, calculate thread dimensions, analyze tolerance zones, and explore detailed geometry diagrams — all in one place.
Standard Compliant Engineering Computations
Popular Machining Threads
Tools & Databases
Comprehensive tools and databases designed specifically for CNC machinists, toolmakers, and mechanical engineers.
ISO Metric Thread Tool
Learn about the most common general-purpose screw thread standard worldwide, including M-profile geometry, notations, and tolerances.
ASME Unified Thread Calculator
Discover the United States standard for screw threads, covering UNC, UNF, and UNEF series along with their respective tolerance classes.
Thread Notations & Profile Terms
A plain-language guide to thread notation: what D, d, D2, P and H stand for, how to read a designation such as M10 × 1.5 – 6g or 1/4-20 UNC-2A, and what crest, root, flank and the profile families mean.
Thread Designation Guide
Type any thread designation, such as M10x1.5-6g or 1/4-20 UNC-2A, and see what every part means. Then read how each family is written: metric, Unified, Acme, buttress, pipe and hose threads.
SolidWorks Integration
Download pre-configured SolidWorks thread library (.SLDLFP) databases, copy automation macros, track active CAD hours, and generate AI material textures.
Thread Fit Check
Pick an external and an internal ASME thread and see whether they assemble: clearance or interference over both tolerance zones, a fit map and the engaged thread to scale.
Twist Drill Sizes
Every ASME B94.11M twist drill with its lengths, shank and tolerances, drawn to scale, plus a drill finder and the drills that fit each tapped hole.
Every Thread Series We Cover
12 standards and 33 thread series, each with its own page for every size, with the external and the internal thread.
ISO 68-1 · Metric
ISOASME B1.1 · Unified inch
ASMEASME B1.5 · Acme
ASMEASME B1.8 · Stub Acme
ASMEASME B1.9 · Buttress
ASMEASME B1.10M · Unified miniature
ASMEASA B1.11 · Microscope objective
ASMEASME B1.13M · Metric M profile
ASMEASME B1.20.1 · Pipe, general purpose
ASMEASME B1.20.3 · Dryseal pipe
ASMEASME B1.20.7 · Hose coupling
ASMEASME B1.21M · Metric MJ profile
ASMEEngineered for CNC Machinists, Toolmakers & CAD Designers
Fasteners Standards bridges theoretical thread geometry with real-world CNC shop machining. Get instant, mathematically verified limit boundaries and eliminate thread stripping, tapping binding, and inspection rejects.
Exact Pitch Diameter Limits
Full calculation of fundamental deviations (es, EI) for ISO 965-1 (6g, 6H, 4h) and ASME B1.1 Class 2A, 2B, 3A, and 3B fits. Ensure GO/NO-GO thread plug and ring gauge compliance every time.
Microscopic Geometry Diagrams
Real-time interactive SVG diagrams render internal and external thread profiles side-by-side with exact root truncations, crest chamfers, and pitch line relationships.
SolidWorks CAD Automation
Download ready-to-use .SLDLFP Library Feature Parts, automation VBA macros, and material generators directly integrated into SolidWorks workflows for parametric modeling.
Latest Blogs & Guides
Deep dives, machining best practices, and engineering tutorials to level up your manufacturing knowledge.
ISO3 Articles
ISO (International Organization for Standardization) is an independent international body that develops global standards for quality, safety, and efficiency. It was established in 1947 and operates in over 160 countries. ISO standards ensure products and services are reliable, safe, and compatible worldwide.
- •ICS Standards Explained: Structure, Categories & How to Use the International Classification for Standards
- •ISO Fasteners – Types, Classification & Engineering Applications
- •The Origin of ISO: The London 1946 Meeting
ASME1 Articles
The American Society of Mechanical Engineers (ASME) is a globally recognized organization that develops technical codes and standards for mechanical engineering. Founded in 1880, ASME was created to improve industrial safety and standardize engineering practices after frequent boiler accidents.
- •ASME Standards – Origin & History
Engineering Guides1 Articles
Comprehensive engineering guides covering thread standards, fastener specifications, tolerances, thread geometry, design practices, and manufacturing applications.
- •ISO vs ASME Thread Standards: Complete Engineering Guide
Frequently Asked Questions
Clear answers on ISO & ASME fastener specifications, tolerance calculations, and SolidWorks CAD integration.
Fasteners Standards covers ISO 68-1 (Basic Profile geometry), ISO 261 (General Metric Pitch Series), ISO 965-1 and ISO 965-2 (Metric Thread Tolerances and Fits such as 6g, 6h, 6H, 4h), ASME B1.1-2019 (Unified Inch Screw Threads UNC, UNF, UNEF for Classes 1A/1B, 2A/2B, and 3A/3B), and ANSI/ASME B1.5 (Acme General Purpose Threads).
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