Hole Pattern Template Generator

Create precise drilling templates for linear, grid, and circular bolt hole patterns with 3D visualization and full-scale printable PDFs. Perfect for bolt circles, mounting plates, and precision drilling projects.

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Features

Multiple Pattern Types

Create linear, rectangular grid, and circular bolt circle patterns (BCD) with precise spacing and custom hole counts.

Real-Time 3D Preview

See your hole pattern in an interactive 3D view. Rotate, zoom, and inspect your design from any angle before drilling.

Full-Scale PDF Templates

Export professional 1:1 scale drilling templates with grid lines, hole centers, and specifications ready for printing and direct use.

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Standard Fasteners

Select from hundreds of standard fasteners (metric and imperial) with automatic tap drill, clearance, and thread sizing calculations.

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Inch & Metric Support

Switch between imperial (inches) and metric (mm) units seamlessly with instant conversion of all dimensions.

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Fast & Free

No installation, no signup. Works instantly in your browser on desktop, tablet, and mobile devices. Completely free to use.

How to Use

Choose Pattern Type

Select from linear (single row), grid (rectangular array), or circular (bolt circle) pattern types.

Configure Hole Size

Use simple diameter input or select from standard fasteners. The tool automatically calculates tap drill sizes and clearance holes.

Set Pattern Dimensions

Specify hole count, spacing, or bolt circle diameter based on your pattern type. The 3D preview updates in real-time.

Review in 3D

Inspect your pattern from all angles in the interactive 3D viewer. Verify dimensions and hole positioning.

Export & Print

Generate a full-scale PDF template with grid lines and measurements. Print at 100% scale and use directly for drilling.

Common Applications

⚙️ Bolt Circle Patterns

Create precise bolt circle diameter (BCD) patterns for flanges, mounting plates, and circular assemblies.

🔩 Mounting Plates

Design custom mounting plates with grid patterns for equipment installation and bracket fabrication.

🏗️ Structural Connections

Generate drilling templates for beam connections, gusset plates, and structural steel fabrication.

🚗 Wheel Adapters

Create accurate bolt patterns for custom wheel adapters and hub spacers with PCD specifications.

🔧 Machine Fixtures

Design precise hole patterns for jigs, fixtures, and tooling with tight tolerance requirements.

📐 Custom Fabrication

Generate drilling guides for custom metalwork, woodworking, and prototype development projects.