Fastening Holes: surface_finish Ra 1.6μm to 3.2μm

Component Specifications

Definition

Fastening holes are engineered apertures in mounting frames that provide precise locations for securing components through mechanical fasteners. These holes are typically drilled, reamed, or tapped to exact specifications to ensure proper alignment, load distribution, and vibration resistance in industrial applications. They serve as critical connection points that maintain structural integrity while allowing for assembly, disassembly, and maintenance of machine components.

Working Principle

Fastening holes work by providing geometrically precise locations where mechanical fasteners (bolts, screws, rivets) can be inserted to create secure connections between the mounting frame and attached components. The holes distribute clamping forces evenly across the frame material, preventing stress concentration while maintaining alignment. Threaded holes create internal mating surfaces for screws, while through-holes allow bolts to pass through for nut fastening on the opposite side.

Materials

Typically matches the mounting frame material: carbon steel (A36, 1018, 1045), stainless steel (304, 316), aluminum alloys (6061, 7075), or engineered plastics. Hole surfaces may have additional treatments: zinc plating, anodizing, or passivation for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thread Class	6H for internal threads, 6g for external threads
Surface Finish	Ra 1.6μm to 3.2μm
Countersink Angle	82°, 90°, or 100°
Positional Tolerance	±0.05mm to ±0.2mm
Minimum Edge Distance	1.5× hole diameter
Hole Diameter Tolerance	±0.1mm to ±0.01mm

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 273, ISO 4759-1, DIN 76-1, DIN 931, ASME B18.2.1

Parent Products

This component is used in the following industrial products

Mounting Frame

Structural component designed to securely hold and position safety interlock and viewport assemblies within industrial equipment.

View Product Details

Actuator/Mount

A mechanical interface and positioning component that securely attaches and precisely aligns the actuator to the beam steering mirror assembly.

View Product Details

Engineering Analysis

Risks & Mitigation

Thread stripping from over-torquing
Hole elongation from cyclic loading
Corrosion in harsh environments
Misalignment causing stress concentration
Fatigue failure at hole edges

FMEA Triads

Trigger: Incorrect hole diameter or positional tolerance
Failure: Misalignment during assembly leading to improper fastener seating
Mitigation: Implement statistical process control (SPC) for drilling operations and use coordinate measuring machines (CMM) for verification

Trigger: Insufficient edge distance around holes
Failure: Material tearing or cracking under load
Mitigation: Follow design standards for minimum edge distance (typically 1.5× hole diameter) and conduct finite element analysis (FEA) for stress distribution

Trigger: Corrosive environment without proper surface treatment
Failure: Reduced fastener grip strength and potential seizure
Mitigation: Apply appropriate coatings (zinc plating, anodizing) and specify corrosion-resistant materials for harsh environments

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 2768-mK for general tolerances, ISO 4759-1 for thread tolerances

Test Method

Coordinate measuring machine (CMM) verification, go/no-go gauge testing, torque testing per ISO 16047, salt spray testing per ASTM B117 for corrosion resistance

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 Fastening Holes

Manufacturer profiles associated with Fastening Holes.

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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 most critical tolerances for fastening holes in mounting frames?

Positional tolerance (±0.05mm-0.2mm) and diameter tolerance (±0.01mm-0.1mm) are most critical as they ensure proper alignment and fastener fit, preventing misalignment, stress concentration, and assembly issues.

How do I select the right fastening hole type for my application?

Consider load requirements (shear vs. tensile), environmental conditions (corrosion resistance), assembly frequency (threaded vs. through-holes), and material compatibility. Through-holes with nuts are best for high-load applications, while threaded holes suit frequent disassembly needs.

What maintenance do fastening holes require?

Regular inspection for wear, corrosion, or thread damage; cleaning to remove debris; lubrication of threaded holes; and torque verification during reassembly to prevent loosening from vibration.

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.

Fastening Holes