# CNC Machining Tolerance Tables: ISO 2768, GD&T and Process Limits > CNC machining tolerance tables for ISO 2768, GD&T, turning, milling, injection molding and precision manufacturing, with process limits and design notes. https://www.sinbo-machining.com/resources/tolerance-table/ --- ## On This Page - Precision Manufacturing Standards - CNC Tolerances - Molding Tolerances - PM & MIM - 3D Printing - CNC Machining Tolerances - Standard Machining Tolerances (ISO 2768-m) - Material-Specific Precision Capabilities - Geometric Dimensioning & Tolerancing (GD&T) - Injection Molding Tolerances - Powder Metallurgy & MIM Tolerances - Quality Standards & Certifications - International Standards - Measurement Equipment - Download Complete Tolerance Reference - Complete Tolerance Tables - GD&T Reference Guide - Quality Control Checklist - Tolerance FAQs - What tolerance should I specify for my parts? - How does material affect achievable tolerances? - What's the difference between standard and precision tolerances? - Start Your Manufacturing Project Today [Precision Manufacturing] # Tolerance & Precision Tables Comprehensive guide to machining tolerances, precision capabilities, and quality standards ISO Standards ±0.005mm Precision IATF 16949:2016 ## Precision Manufacturing Standards Our tolerance tables provide comprehensive reference data for various manufacturing processes. From standard machining tolerances to specialized precision requirements, find the exact specifications for your project. ### CNC Tolerances Standard and precision machining capabilities ### Molding Tolerances Injection molding precision standards ### PM & MIM Powder metallurgy tolerance ranges ### 3D Printing Additive manufacturing precision levels ## CNC Machining Tolerances Standard tolerance ranges for different materials and processes ### Standard Machining Tolerances (ISO 2768-m) | Dimension Range (mm) | Linear Tolerance (mm) | Angular Tolerance | Flatness (mm) | Surface Roughness (Ra) | ≤ 6 | ±0.1 | ±1° | 0.05 | 1.6-3.2 | 6 - 30 | ±0.1 | ±30' | 0.05 | 1.6-3.2 | 30 - 120 | ±0.15 | ±20' | 0.1 | 1.6-3.2 | 120 - 400 | ±0.2 | ±10' | 0.15 | 3.2-6.3 | 400 - 1000 | ±0.3 | ±5' | 0.2 | 3.2-6.3 ### Material-Specific Precision Capabilities #### Aluminum Alloys Standard Tolerance: ±0.025mm Precision Tolerance: ±0.005mm Bore Tolerance: H6-H7 Surface Finish: Ra 0.8-1.6 Positional Tolerance: ±0.01mm #### Steel Alloys Standard Tolerance: ±0.025mm Precision Tolerance: ±0.005mm Bore Tolerance: H6-H7 Surface Finish: Ra 0.8-3.2 Positional Tolerance: ±0.01mm #### Titanium Alloys Standard Tolerance: ±0.05mm Precision Tolerance: ±0.01mm Bore Tolerance: H7-H8 Surface Finish: Ra 1.6-3.2 Positional Tolerance: ±0.02mm ### Geometric Dimensioning & Tolerancing (GD&T) ⌖ Circularity ±0.005mm ○ Cylindricity ±0.01mm ⏥ Flatness 0.005mm/100mm ⊥ Perpendicularity ±0.01mm/100mm ∥ Parallelism ±0.01mm/100mm ⌒ Profile ±0.01mm ◎ Position ±0.01mm ⏊ Symmetry ±0.01mm ## Injection Molding Tolerances Comprehensive tolerance standards for plastic injection molding #### Standard Molding Tolerances | Dimension (mm) | Commercial | Precision | < 25 | ±0.15 | ±0.05 | 25 - 50 | ±0.20 | ±0.08 | 50 - 100 | ±0.25 | ±0.10 | 100 - 150 | ±0.30 | ±0.15 | > 150 | ±0.40 | ±0.20 #### Material-Specific Tolerances ABS (Acrylonitrile Butadiene Styrene) • Shrinkage: 0.5-0.8% • Warpage: ±0.1mm • Dimensional: ±0.2% of size • Surface: Ra 0.8-1.6 Polycarbonate (PC) • Shrinkage: 0.6-0.9% • Warpage: ±0.15mm • Dimensional: ±0.3% of size • Surface: Ra 0.4-0.8 Polypropylene (PP) • Shrinkage: 1.5-2.0% • Warpage: ±0.3mm • Dimensional: ±0.5% of size • Surface: Ra 1.6-3.2 ## Powder Metallurgy & MIM Tolerances Precision capabilities for powder metal and metal injection molding #### Conventional PM Linear Tolerance: ±0.1-0.3% Wall Thickness: ±0.05mm Hole Diameter: ±0.1mm Flatness: 0.05mm/100mm Surface Finish: Ra 1.6-3.2 #### Metal Injection Molding Linear Tolerance: ±0.3-0.5% Wall Thickness: ±0.02mm Hole Diameter: ±0.05mm Flatness: 0.03mm/100mm Surface Finish: Ra 0.8-1.6 #### Metal 3D Printing Linear Tolerance: ±0.1-0.2mm Wall Thickness: ±0.05mm Hole Diameter: ±0.1mm Flatness: 0.1mm/100mm Surface Finish: Ra 6.3-12.5 ## Quality Standards & Certifications Our precision capabilities meet international quality standards ### International Standards ISO 9001:2015:2015 Quality Management System IATF 16949:2016:2016 Automotive Quality Management ISO 14001:2015:2015 Environmental Management ### Measurement Equipment CMM (Coordinate Measuring) Accuracy: ±0.001mm Optical Comparator Magnification: 10x-100x Surface Profilometer Ra measurement: 0.01-20μm ## Download Complete Tolerance Reference Get our comprehensive PDF reference guide with detailed tolerance tables, GD&T symbols, and quality standards. ### Complete Tolerance Tables Comprehensive reference guide ### GD&T Reference Guide Symbols and applications ### Quality Control Checklist Inspection and verification Need help with tolerance specifications? [Call Our Experts ](tel:+86 183 1987 0026)[Contact Us ](https://www.sinbo-machining.com/contact/) ## Tolerance FAQs Common questions about manufacturing tolerances ### What tolerance should I specify for my parts? Start with the loosest tolerance that meets your functional requirements. Tighter tolerances increase costs significantly. Standard tolerances (±0.1mm) work for most applications. ### How does material affect achievable tolerances? Material properties like hardness, thermal expansion, and machinability affect achievable tolerances. Softer materials generally allow tighter tolerances than harder materials. ### What's the difference between standard and precision tolerances? Standard tolerances (±0.1mm) are suitable for most applications. Precision tolerances (±0.005mm) require specialized equipment and processes, with significantly higher costs. ## Start Your Manufacturing Project Today Get in touch with our experts for professional consultation and competitive quotes [Get Quote ](https://www.sinbo-machining.com/quote/)[Consult Expert ](https://www.sinbo-machining.com/contact/)