INDUSTRY COMPONENT

Locating Pins

Precision locating pins for accurate workpiece positioning in machining fixtures

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Component Specifications

Definition
Locating pins are precision-engineered cylindrical components used in workpiece fixtures to establish and maintain accurate positioning of workpieces during machining, assembly, or inspection operations. They provide repeatable reference points that ensure dimensional accuracy and consistency in manufacturing processes.
Working Principle
Locating pins function by fitting into precisely machined holes or slots in the workpiece or fixture base. They restrict degrees of freedom through geometric constraints, typically using two pins: one round pin for primary location and one diamond pin (or relieved pin) to accommodate manufacturing tolerances while preventing over-constraint. This 3-2-1 locating principle ensures stable positioning without distortion.
Materials
Typically made from hardened tool steel (A2, D2, O1), stainless steel (440C, 17-4PH), or carbide for wear resistance. Surface hardness: 58-62 HRC for steel pins. Corrosion-resistant coatings like TiN or chrome plating may be applied.
Technical Parameters
  • Head types Plain, knurled, threaded, flanged
  • Straightness 0.01 mm per 100 mm
  • Surface finish Ra 0.4 μm or better
  • Length variations Standard 10-100 mm, custom available
  • Diameter tolerance h6/h7 (ISO)
Standards
ISO 2768, DIN 6325, ISO 8015

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Locating Pins.

locating pins workpiece fixture positioning pins machining fixture components precision tooling dowel pins fixture design Locating Pins in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Workpiece Fixture

A mechanical device used to securely hold and position a workpiece during manufacturing operations

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Modular Tooling Fixtures

Interchangeable, standardized fixtures used to precisely position and secure chassis components during assembly operations.

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Quick-Change Adapter

A mechanical interface component that enables rapid switching between different workpiece fixtures or tooling setups without extensive recalibration.

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Engineering Analysis

Risks & Mitigation
  • Workpiece distortion from over-constraint
  • Wear leading to positioning inaccuracy
  • Corrosion in harsh environments
  • Pin breakage under excessive load
FMEA Triads
Trigger: Insufficient hardness or improper material selection
Failure: Rapid wear causing positioning drift
Mitigation: Use hardened materials (58+ HRC) with appropriate coatings; implement regular inspection schedules
Trigger: Improper pin geometry or tolerance
Failure: Workpiece binding or inaccurate positioning
Mitigation: Follow 3-2-1 locating principles; use diamond pins for secondary location; maintain h6/h7 tolerances

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Geometric tolerancing per ISO 1101, Position tolerance typically ±0.01 mm
Test Method
CMM verification, functional gaging, wear measurement with micrometers

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between round and diamond locating pins?

Round pins provide precise radial location, while diamond pins (with relieved sides) accommodate tolerance variations in hole spacing without causing binding, following the 3-2-1 locating principle.

How do I select the proper locating pin material?

Choose based on application: tool steel for general machining, stainless for corrosive environments, and carbide for high-wear applications or when machining abrasive materials.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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