Related Resources: mechanical-tolerances

Clearance Holes and Tolerances for Inch Size Fasteners

Tolerances, Engineering Design & Limits & Fits

Clearance Holes and Tolerances for Inch Size Fasteners per. ASME B18.2.8-1999, R2010

The hole sizes for inch fasteners are patterned after USA common usage and the general clearances translated from the metric standard. The hole tolerances are based on the ISO System of Limits and Fits, as required by ISO 273.

The tabulated drill and hole sizes, lists the inch fastener clearance hole recommendations. The recommended drill sizes for inch fasteners are tabulated by nominal drill designation as letter, numbers, or fractional sizes. The drill sizes were selected to provide as nearly as practical a step-patterned clearance size for the minimum recommended hole . The maximum recommended hole size is based on standard hole tolerances.

Related

• Preferred Tolerance Limits Fits ANSI B4.1
• Cylindrical Fits and Tolerances Table for IP and Metric
• Preferred Tolerances Limits Fits Calculator RC - LTs
• Preferred Force Shrink Fits ANSI B4.1 Calculator
• Table of Hole Bore Tolerances per. ISO 286 Calculator
• Table of Shaft Tolerances per. ISO 286 Calculator
• Socket Head Installation & Design Tolerances
• Gage Tolerance Calculator ASME B89.1.5 Pin and Ring Gauges
• Ring gage and Master Disc Tolerances per B89.1.5
• Tolerance Calculator Fixed Fastener Condition
• Hole / Feature Pattern Plot
• Bearing Shaft and Housing Installation Tolerances Size and fit tolerances
• Standard Tolerances for Drop Forgings
• Thickness and Ejector Marks Tolerance Calculator Grade F Forgings
• Thickness of Wall and Ejector Marks Tolerance Calculator Grade E per. EN-10243-1 for Non-Circular Forgings