ISO 4287 Surface Texture Measurement Standard

Geometrical Product Specifications (GPS) - Surface texture: Profile method - Terms, definitions and surface texture parameters for precise measurement and quality control of key manufacturing and automotive components.

Standard Overview

Standard Code

ISO 4287:1997

Publication Date

1997-04-01

Status

Active ISO Standard

Application

Surface Measurement

Roughness Parameters

Ra - Arithmetic Mean Roughness

Average absolute deviation of roughness profile from mean line

Formula: Ra = (1/l) ∫|Z(x)|dx
Typical Range: 0.025 - 50 μm
Key Application: General surface quality

Rz - Maximum Height

Maximum height of roughness profile within evaluation length

Definition: Rp + Rv (peak + valley)
Typical Range: 0.1 - 200 μm
Key Application: Functional surfaces

Rq - Root Mean Square

Root mean square deviation of roughness profile

Formula: Rq = √[(1/l) ∫Z²(x)dx]
Relation: Rq ≈ 1.25 × Ra
Key Application: Statistical analysis

Measurement Procedures

Sample Preparation

Proper specimen preparation for accurate surface texture measurement

Cleaning: Remove contaminants and debris
Mounting: Secure positioning for stability
Environment: 20°C ± 2°C, vibration-free

Measurement Setup

Configuration of measurement equipment and parameters

Cutoff Length: 0.08 - 25 mm (λc)
Evaluation Length: 5 × λc (typical)
Stylus Force: 0.75 mN (standard)

Frequently Asked Questions

What is ISO 4287?

ISO 4287 is an international standard that defines terms, definitions, and surface texture parameters for geometrical product specifications using the profile method for surface texture measurement.

What are the main roughness parameters in ISO 4287?

The main roughness parameters include Ra (arithmetic mean roughness), Rz (maximum height of roughness profile), Rq (root mean square roughness), and Rt (total height of roughness profile).

How does ISO 4287 apply to key manufacturing?

ISO 4287 ensures consistent surface finish quality for key components, affecting wear resistance, corrosion protection, and proper fit in lock mechanisms through standardized measurement procedures.

What is the difference between Ra and Rz parameters?

Ra represents the average roughness over the entire measurement length, while Rz represents the maximum peak-to-valley height, providing different insights into surface characteristics.

Official Standards Authority

ISO International Organization

Access the official ISO 4287 standard documentation for surface texture measurement procedures and roughness parameter specifications.

Visit ISO Official Site

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