Alignment Dowel/Pin: Diameter Tolerance h6/h7 (ISO)

Component Specifications

Definition

A precision-machined cylindrical dowel or pin designed to ensure exact alignment between modular machine components during assembly. It provides positive location and prevents relative movement between mating parts, maintaining dimensional accuracy and repeatability in modular connection systems.

Working Principle

Utilizes interference fit or clearance fit in precisely machined holes to establish and maintain accurate positional relationship between modular components. The dowel/pin engages with corresponding holes in mating parts, creating a fixed reference point that ensures proper alignment while allowing for thermal expansion and manufacturing tolerances.

Materials

Typically made from hardened alloy steel (AISI 4140, 4340), stainless steel (304, 316), or tool steel (D2, O1) with surface treatments including nitriding, chrome plating, or black oxide coating for wear resistance and corrosion protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	58-62 HRC (hardened steel)
Straightness	0.01mm per 100mm
Concentricity	0.005mm
Surface Finish	Ra 0.4-0.8μm
Length Tolerance	±0.1mm
Diameter Tolerance	h6/h7 (ISO)

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 8734, DIN 6325, ISO 2338, DIN 7

Parent Products

This component is used in the following industrial products

Modular Connection Interface

A standardized interface component that enables secure and repeatable connections between modular tooling fixtures and workpieces or other fixtures.

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Engineering Analysis

Risks & Mitigation

Misalignment due to worn dowels
Shear failure under excessive loads
Corrosion in harsh environments
Improper installation causing damage
Thermal expansion mismatch

FMEA Triads

Trigger: Wear from repeated assembly/disassembly
Failure: Reduced positional accuracy leading to machine misalignment
Mitigation: Implement regular inspection schedule, use wear-resistant coatings, establish replacement intervals based on usage cycles

Trigger: Incorrect installation force
Failure: Deformation of dowel or mating components
Mitigation: Use calibrated installation tools, follow manufacturer torque specifications, provide proper training for assembly personnel

Trigger: Corrosive environment exposure
Failure: Seizure or difficult removal during maintenance
Mitigation: Select corrosion-resistant materials (stainless steel), apply protective coatings, implement regular lubrication schedule

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 2768-mK for general tolerances, specific geometric tolerances per ISO 1101

Test Method

Coordinate measuring machine (CMM) verification, surface roughness testing per ISO 4287, hardness testing per ISO 6508

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 Alignment Dowel/Pin

Manufacturer profiles associated with Alignment Dowel/Pin.

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Frequently Asked Questions

What is the difference between a dowel pin and an alignment pin?

Dowel pins typically refer to precision cylindrical pins with tight tolerances for permanent or semi-permanent alignment, while alignment pins may include various designs (tapered, shouldered) for temporary alignment during assembly. Both serve similar positioning functions but differ in application methods and removal requirements.

How do I select the correct alignment dowel size?

Select based on: 1) Required positional accuracy (tighter tolerances for higher precision), 2) Load requirements (shear strength), 3) Material compatibility (corrosion resistance), 4) Assembly method (press fit vs. slip fit), and 5) Industry standards applicable to your equipment.

Can alignment dowels be reused?

Hardened steel dowels with proper surface treatments can typically be reused if they maintain dimensional accuracy and surface integrity. However, press-fit dowels may require replacement after disassembly due to potential deformation or wear in the mating holes.

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.

Alignment Dowel/Pin