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Four Ball Friction and Wear Testing Machine

Four Ball Friction and Wear Testing Machine

ASTM D2266. Four-ball tribometer

Four Ball Friction and Wear Testing Machine / Four-ball tribometer is used to determine the friction and wear properties of lubricant, including oil and grease, under varying load conditions. It accurately assesses the load-bearing capacity of lubricants through several key metrics: maximum non-seizure load (Pb), sintering load (Pd), and comprehensive wear value (ZMZ). This machine allows for long-term wear tests without compromising the precision of the Pb measurement, even after multiple Pd tests. It can also measure the coefficient of friction while recording friction force and temperature curves. For enhanced precision, the system can be equipped with high-accuracy measuring devices to calculate and display wear scar diameters on-screen. With specialized attachments, these friction and wear testing machines can perform end-face wear tests and simulate material behavior under specific conditions.

General Introduction

Four Ball Friction and Wear Testing Machine / Four-ball tribometer is used to determine the friction and wear properties of lubricant, including oil and grease, under varying load conditions. It accurately assesses the load-bearing capacity of lubricants through several key metrics: maximum non-seizure load (Pb), sintering load (Pd), and comprehensive wear value (ZMZ). This machine allows for long-term wear tests without compromising the precision of the Pb measurement, even after multiple Pd tests. It can also measure the coefficient of friction while recording friction force and temperature curves. For enhanced precision, the system can be equipped with high-accuracy measuring devices to calculate and display wear scar diameters on-screen. With specialized attachments, these friction and wear testing machines can perform end-face wear tests and simulate material behavior under specific conditions.

Four Ball Friction and Wear Testing Machine

Main features

  • Features
  • Standard
  • Application

1, Computer control and display system, real time display the load, friction force, RPM, rotate cycles, time, temperature.

2, Load cell to measure the load/force.

3, High precision microscope, 25X multiple times.

4, High temperature friction pairs, and ambient temperature friction pairs.
5, protection function, friction force, load, rotate cycles times etc.,

6, Real time record force-time and load-time test curve, high sampling rate.

7, When the load reach the higher limit, will automatic trigger overload protection.

Four Ball Friction and Wear Testing Machine


ASTM D2266 "Standard Test Method for Wear Preventive Characteristics of Lubricating Grease (Four Ball Method) “


ASTM D4172 “Standard Test Method for Wear Preventive Characteristics of Lubricating Fluids (Four Ball Method)”


It applies to major petrochemical, iron and steel metallurgy, transportation and other industries and institutions of higher learning field. Can be used at ambient temperature or high temperature, upto 250 degree, and can execute time pre-selection, friction and temperature advance setting.

Main Technical Specification

Test load range60N~10kN
Relative error±1%
Friction force range0~300N
Friction force accuracy±3%
Main spindle RPM200~2000r/min
Main spindle rotation speed accuracy±5r/min
Friction pairs temperature control rangeAmbient remp. ~70℃
Friction pairs temperature control error± 2℃
Time control and display range1 S ~ 999H
Revolution counter of main spindle1~99999999
Steel ballφ12.7mm
Dimensions1200*870*1700mm
Weight600Kg


Main Accessories

ItemQuantity
Frame1   set
Computer1 set
Printer1 set
High temperature friction pairs2   pairs
Ambient temperature friction pairs2   pairs
Steel balls1   box
Oil thrower (high and room temp.)Each   1 pc
Spring chuck2   pcs
Moment wheel1   pc
Platinum resistor2   pcs
15J Microscope1 set
Tools1   set
Professional measuring software in English1 set
Documents (Manual, packing list, certificate)


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Beijing United Test Co., Ltd.