Bore/Hole Features: Roundness ≤0.005 mm

Component Specifications

Definition

Bore/hole features refer to engineered cylindrical cavities or openings created through machining processes like drilling, boring, reaming, or honing in precision components. These features are characterized by specific dimensions (diameter, depth), tolerances (IT grades), surface finish (Ra values), geometric accuracy (roundness, straightness), and positional relationships to other features. They serve functional purposes such as housing bearings, shafts, or pins; facilitating assembly with fasteners; enabling lubrication or cooling channels; or providing pathways for electrical wiring or hydraulic/pneumatic systems. Critical in mechanical design, they ensure proper fit, alignment, and performance in assemblies, with quality governed by international standards for dimensional and geometric tolerancing.

Working Principle

Bore/hole features operate on principles of precise dimensional control and geometric accuracy to achieve functional interfaces. They are created by removing material using cutting tools (e.g., drills, boring bars) or abrasive processes (e.g., honing), with the tool rotating or the workpiece moving to form the cylindrical shape. The principle involves maintaining tight tolerances (e.g., H7/g6 fits) and surface integrity to ensure components like shafts or bearings fit securely, rotate smoothly, or seal effectively. In operation, these features provide alignment (e.g., via dowel holes), load transfer (e.g., through bolted connections), or fluid containment (e.g., in hydraulic cylinders), relying on their accuracy to prevent misalignment, vibration, or leakage in mechanical systems.

Materials

Common materials include carbon steels (e.g., AISI 1045, 4140), alloy steels (e.g., AISI 4340), stainless steels (e.g., 304, 316), aluminum alloys (e.g., 6061, 7075), brass, bronze, and engineered plastics (e.g., PEEK, Delrin). Material selection depends on application requirements such as strength, corrosion resistance, wear resistance, and machinability. Specifications often include hardness (e.g., HRC 30-50 for steels), tensile strength, and thermal properties to ensure dimensional stability under operational stresses.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Roundness	≤0.005 mm
Straightness	≤0.01 mm per 100 mm
Surface Finish	Ra 0.4 μm to 3.2 μm
Depth Tolerance	±0.05 mm to ±0.1 mm
Diameter Tolerance	±0.01 mm to ±0.001 mm (IT6-IT8)
Positional Tolerance	±0.02 mm to ±0.05 mm

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 286, ISO 1101, DIN 7172

Parent Products

This component is used in the following industrial products

Precision Machined Components

Precision CNC machined components are drawing-controlled parts made by milling, turning, grinding or EDM for assemblies requiring repeatable fit and finish.

View Product Details

Engineering Analysis

Risks & Mitigation

Dimensional inaccuracies leading to assembly failures
Poor surface finish causing premature wear or leakage
Misalignment in multi-hole patterns affecting system performance

FMEA Triads

Trigger: Tool wear or improper machining parameters
Failure: Oversized or undersized bore, resulting in loose fits or interference fits
Mitigation: Implement regular tool maintenance, use in-process monitoring, and adhere to optimized cutting speeds/feeds per material specifications.

Trigger: Inadequate clamping or workpiece deflection during machining
Failure: Out-of-round or tapered bore, causing vibration or misalignment in operation
Mitigation: Ensure rigid workpiece fixturing, use support fixtures for long bores, and apply light finishing passes to minimize stress.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Complies with ISO 286 for dimensional tolerances (e.g., H7, g6 fits) and ISO 1101 for geometric tolerances (e.g., position, roundness)

Test Method

Testing via CMM measurement per ISO 10360, surface roughness testing per ISO 4287, and functional testing in assembly contexts

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 Bore/Hole Features

Manufacturer profiles associated with Bore/Hole Features.

Sourcing Bore/Hole Features from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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

Related Components

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What is the difference between a bore and a hole in machining?

In machining, a 'hole' generally refers to any cylindrical opening, often created by drilling, while a 'bore' specifically denotes a precision-machined hole with tight tolerances and fine surface finish, typically achieved through boring, reaming, or honing processes for critical applications like bearing fits.

How are bore/hole features inspected for quality control?

Bore/hole features are inspected using tools like coordinate measuring machines (CMMs), bore gauges, air gauges, or optical comparators to verify dimensions, tolerances, roundness, straightness, and surface finish against engineering drawings and standards such as ISO 1101.

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.

Bore/Hole Features