Anchor Bolt Holes: Component Specs, Materials & Applications

Component Specifications

Definition

Anchor bolt holes are precisely machined openings in granite base platforms designed to accommodate anchor bolts that secure heavy machinery to the foundation. These holes ensure proper alignment, load distribution, and vibration damping by providing fixed attachment points between the machine and its base. They are critical for maintaining geometric stability and preventing movement during operation.

Working Principle

Anchor bolt holes work by providing a secure interface between anchor bolts and the granite base. The bolts are inserted into the holes, often with epoxy grout or mechanical expansion systems, creating a rigid connection that transfers operational loads (static weight, dynamic forces, vibrations) from the machine to the foundation. The granite's dimensional stability and low thermal expansion ensure long-term alignment accuracy.

Materials

Granite (typically black or gray granite with low porosity, high compressive strength >200 MPa, and minimal thermal deformation), sometimes with epoxy grout or steel sleeves for reinforcement.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Depth	5-10 times bolt diameter for proper embedment
Spacing	According to machine footprint and load distribution
Tolerance	±0.1 mm positional accuracy, H7 grade for diameter
Thread Type	Optional internal threads (metric or unified)
Hole Diameter	Typically 1.5-2 times bolt diameter (e.g., 20-50 mm)
Surface Finish	Ra 3.2 μm or better to ensure bond strength

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 230-1, DIN 876, ISO 10791-7

Parent Products

This component is used in the following industrial products

Granite Base Platform

A precision granite platform that serves as the stable foundation for an Automated Coordinate Measuring Machine (CMM) system.

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Bed Casting/Weldment

The structural foundation of a machine bed, manufactured through casting or welding processes to provide rigidity and stability.

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Engineering Analysis

Risks & Mitigation

Hole misalignment causing bolt stress
Granite cracking under excessive load
Corrosion in humid environments
Bond failure with epoxy grout

FMEA Triads

Trigger: Improper drilling alignment or tolerance deviation
Failure: Bolt misalignment leads to uneven load distribution and potential machine vibration
Mitigation: Use CNC drilling with laser alignment, implement post-process inspection with CMM

Trigger: Insufficient hole depth or diameter
Failure: Reduced pull-out strength, bolt loosening under dynamic loads
Mitigation: Follow depth/diameter ratios per engineering standards, verify with go/no-go gauges

Trigger: Contamination (oil, dust) in holes during installation
Failure: Poor epoxy bond or bolt seating, compromising stability
Mitigation: Clean holes with compressed air and solvents before bolt installation

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Positional tolerance ±0.1 mm, diameter tolerance H7/g6 fit per ISO 286

Test Method

Dimensional verification with CMM, pull-out testing per ASTM E488, vibration analysis per ISO 10816

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Anchor Bolt Holes

Manufacturer profiles associated with Anchor Bolt Holes.

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Frequently Asked Questions

Why use granite for anchor bolt holes instead of steel or concrete?

Granite offers superior dimensional stability, minimal thermal expansion, excellent vibration damping, and high compressive strength, making it ideal for precision machine foundations where alignment must be maintained over time and under load.

How are anchor bolt holes typically manufactured in granite?

They are precision-drilled using diamond-tipped tools or CNC machining centers, followed by honing or grinding to achieve tight tolerances and smooth surface finishes. Epoxy grouting or sleeve installation may be done post-drilling.

What maintenance is required for anchor bolt holes?

Regular inspection for cracks, debris, or corrosion; cleaning to prevent bolt seizure; and torque checks on bolts. No routine lubrication is needed if non-corrosive materials are used.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Anchor Bolt Holes