INDUSTRY COMPONENT

Locating Pins

Precision locating pins for accurate workpiece positioning in machining fixtures

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
ParameterTypical rangeNotes & selection driver
Head TypesPlain, knurled, threaded, flanged
Straightness0.01 mm per 100 mm
Surface FinishRa 0.4 μm or better
Length VariationsStandard 10-100 mm, custom available
Diameter Toleranceh6/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 2768, DIN 6325, ISO 8015

Parent Products

This component is used in the following industrial products

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

Typical Suppliers & Equivalents

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

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 Locating Pins

Manufacturer profiles associated with Locating Pins.

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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.

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.

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