Manufacturing GuidesFrom Imperial Designs to Metric Production
Practical, mobile-friendly guides for CNC machinists, mechanical engineers, and procurement specialists. Learn machining allowance rules, convert ANSI to ISO tolerances, match imperial fasteners to metric equivalents, and streamline BOM conversion for international suppliers.
Featured Guides
Start with the most requested manufacturing topics
Machining Allowance Guide
Understand roughing vs. finishing allowances by material and process. Includes rule tables and real shop-floor examples.
Read Guide βANSI β ISO Tolerance Conversion
Convert RC/LC/LT/LN/FN classes to ISO fits and IT grades. Step-by-step method with complete reference tables.
Read Guide βFastener Matching: Imperial β Metric
Find metric substitutes for UNC/UNF threads. Strength grade equivalents, tap drill sizes, and compatibility cautions.
Read Guide βBOM Conversion for RFQ
Convert entire BOMs from inches to mm, keep data integrity, and prepare bilingual RFQ files for global suppliers.
Read Guide βTopics & Categories
Machining
Allowance rules, process selection, case studies, and best practices for CNC turning, milling, and grinding.
Tolerance Systems
ANSI classes, ISO IT grades, and fit selection with conversion workflows for mixed-unit assemblies.
Fasteners
Imperial-to-metric matching, strength equivalence, tap drills, clearance holes, and sourcing considerations.
BOM & Procurement
Practical guidance to convert design BOMs, map material grades, and communicate with suppliers in metric.
G-Code & Programming
Switching between G20 and G21, unit consistency, and controller-specific cautions for real-world CNC programs.
Reference & Standards
Material grades, bearings, pipe threads, measurement tools, surface finish, and wire gauge conversions.
Related Tools
Use the calculators alongside the guides
Machining Allowance Calculator
Calculate blank, rough, and finish sizes based on material and process.
Open Tool βTolerance Converter
Convert ANSI B4.1 to ISO 286 tolerance grades and fits for international drawings.
Open Tool βFastener Matcher
Find metric equivalents for imperial threads with compatibility checks and grade mapping.
Open Tool βBOM Batch Converter
Batch convert Excel/CSV BOMs to metric and keep source data intact.
Open Tool βLearn, Convert, and Manufacture with Confidence
Browse the guides, then use our calculators to execute with precision. Built for the real workflows of CNC shops, engineering teams, and global procurement.