Datum Pin / Stop: Diameter 3mm to 25mm (common range)

Component Specifications

Definition

A datum pin or stop is a precision-engineered component integrated into alignment guides to establish fixed reference points, ensuring accurate positioning, alignment, and repeatability of parts or tools during manufacturing, assembly, or inspection processes. It functions as a physical stop or locator to prevent over-travel and maintain consistent positioning.

Working Principle

The datum pin/stop operates by providing a fixed, hardened contact surface that parts or machine components abut against. This creates a repeatable reference point, eliminating positional variability. In alignment guides, it ensures components are consistently positioned relative to a known datum, critical for precision machining, assembly, and quality control.

Materials

Typically made from hardened tool steel (e.g., A2, D2, or O1 steel), stainless steel (e.g., 304 or 416), or carbide for extreme wear resistance. Surface treatments like nitriding, chrome plating, or titanium nitride coating may be applied to enhance durability and corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	10mm to 100mm
Diameter	3mm to 25mm (common range)
Hardness	58-62 HRC (for steel)
Tolerance	±0.005mm to ±0.02mm
Mounting Type	Threaded, press-fit, or flange-mounted

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 286

Parent Products

This component is used in the following industrial products

Alignment Guide

A precision component within a test fixture interface that ensures accurate positioning and alignment of test specimens or devices during measurement or testing procedures.

View Product Details

Engineering Analysis

Risks & Mitigation

Wear and deformation over time
Misalignment due to improper installation
Corrosion in harsh environments
Failure under excessive load leading to positional errors

FMEA Triads

Trigger: Material fatigue or excessive wear
Failure: Loss of dimensional accuracy, causing misalignment
Mitigation: Use wear-resistant materials (e.g., carbide), apply protective coatings, and implement regular inspection and replacement schedules.

Trigger: Improper installation or mounting
Failure: Inconsistent positioning, leading to assembly errors
Mitigation: Follow precise installation procedures, use calibrated tools, and verify alignment during setup with measurement instruments.

Trigger: Exposure to corrosive substances
Failure: Corrosion and pitting, degrading surface integrity
Mitigation: Select corrosion-resistant materials (e.g., stainless steel), apply protective coatings, and maintain clean operating environments.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Typically within ±0.01mm for precision applications, adhering to ISO 2768-mK or tighter standards as required.

Test Method

Dimensional verification using coordinate measuring machines (CMM), optical comparators, or laser scanners; hardness testing per ASTM E18; and wear testing under simulated operational conditions.

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 Datum Pin / Stop

Manufacturer profiles associated with Datum Pin / Stop.

Sourcing Datum Pin / Stop 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.

Related Components

Chrome Plating

Hard chrome plating is an electroplating process that deposits a layer of chromium onto metal surfaces to enhance wear resistance, corrosion protection, and reduce friction for hydraulic cylinder piston rods.

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.

Frequently Asked Questions

What is the primary function of a datum pin in an alignment guide?

Its primary function is to establish a fixed, repeatable reference point that ensures accurate and consistent positioning of parts or tools, critical for precision in manufacturing and assembly processes.

How do I select the right material for a datum pin?

Choose based on application: use hardened tool steel for general wear resistance, stainless steel for corrosion-prone environments, and carbide for high-wear or high-precision applications. Consider factors like load, frequency of use, and environmental conditions.

Can datum pins be customized for specific machines?

Yes, they are often custom-designed to match specific machine interfaces, mounting requirements, and tolerance needs, ensuring optimal compatibility and performance in specialized industrial setups.

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.

Datum Pin / Stop