Locator Pin: Hardness 58-62 HRC for steel pins

Component Specifications

Definition

A locator pin is a precision-engineered cylindrical component used in workpiece positioning fixtures to establish and maintain accurate reference points for machining, assembly, or inspection operations. It ensures repeatable positioning by engaging with corresponding holes or features on workpieces, eliminating positional variation and improving manufacturing accuracy.

Working Principle

The locator pin operates on the principle of geometric constraint, where its precisely machined diameter engages with a mating hole or feature on the workpiece. This creates a fixed reference point that restricts degrees of freedom (typically radial movement), ensuring consistent positioning relative to other fixture elements and machine tools. The interference fit or clearance fit between pin and hole determines the positioning accuracy and repeatability.

Materials

Typically made from hardened tool steel (A2, D2, or O1 grades), stainless steel (304 or 416), or carbide for wear resistance. Surface treatments include nitriding, chrome plating, or titanium nitride coating to enhance durability and corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	58-62 HRC for steel pins
Straightness	0.01 mm per 100 mm length
Concentricity	0.005 mm TIR
Surface Finish	Ra 0.4 μm or better
Length Variations	10-150 mm standard range
Diameter Tolerance	±0.005 mm to ±0.02 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 2768, DIN 6325, ISO 8015

Parent Products

This component is used in the following industrial products

Workpiece Positioning Fixture

A mechanical device that securely holds and precisely positions workpieces during robotic welding operations.

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Engineering Analysis

Risks & Mitigation

Wear leading to positional drift
Contamination causing binding
Improper installation causing damage
Thermal expansion mismatch
Corrosion in harsh environments

FMEA Triads

Trigger: Abrasive wear from repeated insertion/removal
Failure: Increased clearance reduces positioning accuracy
Mitigation: Use hardened materials with wear-resistant coatings, implement regular inspection and replacement schedules

Trigger: Chip or debris accumulation in locating holes
Failure: Binding or inaccurate seating of pin
Mitigation: Implement chip management systems, use through-hole designs with air blast, regular cleaning protocols

Trigger: Excessive force during workpiece loading
Failure: Pin bending or breakage
Mitigation: Design with proper strength calculations, use guided loading systems, operator training on proper handling

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Positional tolerance typically ±0.01 mm to ±0.05 mm depending on application requirements

Test Method

Coordinate measuring machine (CMM) verification, functional gaging, laser interferometry for high-precision applications

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.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Locator Pin

Manufacturer profiles associated with Locator Pin.

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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 is the difference between a locator pin and a dowel pin?

Locator pins are specifically designed for fixture applications with tighter tolerances and often feature chamfers or bullet noses for easy insertion, while dowel pins are general-purpose alignment pins with standard tolerances for permanent assembly applications.

How do I select the right locator pin diameter?

Select based on workpiece hole size, required positioning accuracy, and load conditions. Typically use H7/g6 or H7/h6 fit classes, with diameter determined by the smallest feature to be located while maintaining sufficient strength.

Can locator pins be used in high-temperature applications?

Yes, when made from appropriate materials like H13 tool steel or carbide with suitable heat treatment. Standard tool steel pins are limited to approximately 200°C before losing hardness.

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.

Locator Pin