Tapped Holes/Grid Pattern: Surface Flatness 0.005mm per 300mm

Component Specifications

Definition

A precisely machined pattern of tapped holes arranged in a uniform grid on granite tables or bases, providing standardized mounting points for fixtures, workholding devices, and accessories in precision manufacturing and measurement applications. The grid pattern ensures repeatable positioning and alignment across the entire working surface.

Working Principle

The grid pattern provides a coordinate system of mounting points that allow fixtures and components to be positioned at precise locations. Threaded holes accept bolts to secure items, while the granite's dimensional stability maintains accuracy over time and temperature variations.

Materials

Granite (typically black or gray granite with fine grain structure), Grade A or better with minimal porosity, hardness of 6-7 Mohs, specific density of 2.6-2.8 g/cm³.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Counterbore	Optional for flush mounting
Grid Spacing	25mm, 50mm, or 100mm standard intervals
Thread Class	6H for metric, 2B for imperial
Thread Depth	1.5-2 times bolt diameter
Hole Diameter	M6, M8, M10, or 1/4-20, 5/16-18, 3/8-16 imperial threads
Surface Flatness	0.005mm per 300mm
Positional Tolerance	±0.05mm to ±0.1mm

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, ISO 10791-7, DIN 876, DIN 877

Parent Products

This component is used in the following industrial products

Granite Table/Base

A precision granite platform that serves as the stable reference surface and mounting base for a Coordinate Measuring Machine (CMM).

View Product Details

Engineering Analysis

Risks & Mitigation

Thread damage from improper bolt installation
Chip formation around hole edges from impacts
Debris accumulation affecting positioning accuracy
Thermal expansion mismatch with mounted components

FMEA Triads

Trigger: Cross-threading during fixture installation
Failure: Damaged threads requiring hole repair or abandonment
Mitigation: Use guided installation tools, proper training, and thread protectors when not in use

Trigger: Impact damage from dropped tools or components
Failure: Chipped granite around holes affecting positioning reference
Mitigation: Implement protective covers, establish clear work procedures, use designated tool placement areas

Trigger: Thermal gradients across granite surface
Failure: Positional inaccuracy due to differential expansion
Mitigation: Maintain stable environment temperature, allow thermal stabilization after moves, use temperature-compensated measurement systems

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Positional tolerance per ISO 230-1, flatness per DIN 876 Class 00

Test Method

Laser interferometry for positional accuracy, coordinate measuring machines for verification, thread gauges for thread quality

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 Tapped Holes/Grid Pattern

Manufacturer profiles associated with Tapped Holes/Grid Pattern.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What are the advantages of granite for tapped hole grid patterns?

Granite provides exceptional dimensional stability, vibration damping, thermal stability, and wear resistance, maintaining precision over decades of use in manufacturing environments.

How are tapped hole grid patterns manufactured on granite surfaces?

Using CNC drilling and tapping machines with diamond-tipped tools, following precise coordinate measurements. The process includes precision leveling, drilling, tapping, and quality verification of each hole position.

What maintenance do granite tapped hole grids require?

Regular cleaning to remove debris from threads, occasional verification of positional accuracy, and protection from impacts that could chip the granite around hole edges.

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.

Tapped Holes/Grid Pattern