---
title: How Coefficients of Friction Are Measured for AMPCO® Alloys
description: Understand how AMPCO® friction coefficients are measured — dynamic conditions, SAE 4340 steel counterpart, no lubrication, ambient temperature — and what this means for real-world application comparisons.
---

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# How Coefficients of Friction Are Measured for AMPCO® Alloys

## Test Conditions and Methodology Behind Published Values

*The coefficients of friction published for AMPCO® alloys are measured under dynamic, not static, conditions.

Testing is carried out against SAE 4340 steel, without lubrication, at ambient temperature.

These conditions should be taken into account when comparing published values to actual application conditions, which may involve different counterpart materials, lubrication, temperature, or sliding speeds.*

 

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