Clearance center
Clearance Hole Reference
Clearance is an assembly decision, not simply a hole larger than the fastener. Use the drawing or governing standard when it specifies a value.
Reference library
Focused pages with a clear owner
Each URL answers a distinct question. ThreadSizeGuide avoids automatically generating thin pages for every possible size.
Workshop planning
Inch Clearance Hole Planning Guide
Plan close, general and free-running inch clearance holes while keeping calculated allowances separate from formal standards.
Read reference →Workshop planningMetric Clearance Hole Planning Guide
Plan metric close, general and free-running clearance holes with explicit practical allowances and standard-use boundaries.
Read reference →