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Jump to DN Factor Calculator
Jump to Table 1: DN factor formulas
Jump to Table 2, Grease selector charts: Roller bearings
Jump to Table 2, Grease selector charts: Plain bearings
Jump to Table 2, Grease selector charts: Open gears

What is DN Factor?

DN factor is a value you need in order to determine the correct grease for your bearing and speed. This post shows you how to find the DN factor for the most common bearings.

D stands for diameter, and N stands for speed. The DN factor is therefore a product of diameter and speed. It is obtained by multiplying the average diameter (D + d/2) of a bearing by its revolutions per minute (RPM) and a correction factor that depends on the type of roller element. This will result in a number that allows you to determine what base oil viscosity is needed for that bearing. The precise formula for determining the DN factor varies depending on bearing type. (See Table 1.)

How to Use DN Factor to Determine the Correct Grease for your Bearings

  1. Calculate the DN Factor of your bearing using the calculator above, or one of the formulas in Table 1.
  2. Use your answer to choose the correct grease from one of the charts in Table 2.
  3. Check our Technical Advisor map to find a TA near you to place your order, or just contact Interflon USA at 1-877-FIN-LUBE.

Background

In the early days of industrial machinery, little thought was given to whether a particular grease was the right choice for a particular application, because there were so few types of greases to choose from.

Today, however, there are many different types of greases, each one tailored for a specific application. This is advantageous because the correct grease selection:

  • is suitable for bearing operating temperature
  • results in the lowest possible energy and re-lubrication costs
  • helps obtain maximum component life
  • provides maximum protection against corrosion

However, it does complicate the process of choosing the right grease. Interflon seeks to make this process easier by providing the information essential to making the correct lubricant choice.

Interflon manufactures grease for nearly every type of bearing application. If, after looking at these tables, you are still in doubt about which grease is correct for your application, please contact your closest Technical Advisor (TA) or call our main office at (877) FIN-LUBE to ask. We’re always happy to talk!

Table 1: Formulas for Determining DN Factor

Instructions

Identify the correct type of bearing for your application. Then use the formula to the right to calculate the DN factor for that bearing type.

Bearing Type Formula
inner and outer bearing diameters

Note:

A = inner diameter

B = outer diameter

open gear

Open Gear

DN factor = diameter (mm) x RPM (r/min)

plain bearing

Plain Bearing

DN factor = diameter shaft (mm) x RPM (r/min)

ball bearing

Ball Bearing

DN factor = ((A+B)/2) (mm) x RPM (r/min)

double-row ball bearing

Double-row Ball Bearing

DN factor = ((A+B)/2) (mm) x RPM (r/min)

cylindrical bearing

Single-row Cylindrical Bearing

DN factor = ((A+B)/2) (mm) x RPM (r/min) x 2

double-row cylindrical bearing

Double-row Cylindrical Bearing

DN factor = ((A+B)/2) (mm) x RPM (r/min) x 2

single conical spherical bearing

Single Conical and Spherical Bearings

DN factor = ((A+B)/2) (mm) x RPM (r/min) x 3

double conical and spherical bearing

Double Conical and Spherical Bearings

DN factor = ((A+B)/2) (mm) x RPM (r/min) x 3

needle bearing

Needle Bearing

DN factor = ((A+B)/2) (mm) x RPM (r/min) x 3

Chart 2: Grease Selector

Instructions
Taking the DN factor you calculated above, use the chart below to find the correct grease for your bearing.

Roller Bearings

DN factor Interflon product

DN < 60 000

Interflon Grease LS1/2

Interflon Grease OG

Interflon Grease LS2

Interflon Food Grease EP

Interflon Food Grease LT2 (Low temperature: -45° C/-49° F)

Interflon Food Grease HD2

Interflon Food Grease 1

Interflon Grease HTG

Interflon Grease HD2

Interflon Fluor Grease

DN < 120,000

Interflon Grease LS2

Interflon Food Grease EP

Interflon Food Grease 2

Interflon Food Grease LT2 (Low temperature: -45° C/-49° F)

Interflon Food Grease HD2

Interflon Food Grease 1

Interflon Grease HTG (High temperature: >150° C/302° F)

Interflon Grease MP2/3

Interflon Grease HD2

Interflon Fluor Grease

DN < 250,000

Interflon Food Grease EP

Interflon Food Grease 2

Interflon Food Grease LT2 (Low temperature: -45° C/-49° F)

Interflon Food Grease HD2

Interflon Food Grease 1

Interflon Grease HTG (High temperature: >150° C/302° F)

Interflon Grease MP2/3

Interflon Grease HD2

Interflon Fluor Grease

DN < 350,000

Interflon Grease MP1

Interflon Grease MP2/3

Interflon Grease HD2

Interflon Bio Grease MP2

DN < 500,000

Interflon Grease MP2/3

Interflon Grease HD2

DN < 680,000

Interflon Grease MP2/3

DN < 1,000,000

Interflon Grease HS2

DN > 1,000,000

Please contact us to discuss alternate lubrication solutions for bearings with a DN factor of over 1 million.

Plain Bearings

DN factor Interflon product

DN < 7,500

Interflon Grease LS2

Interflon Grease LS1/2

DN 7,500 – 30,000

Interflon Food Grease EP

Interflon Food Grease 2

Interflon Food Grease LT2

Interflon Food Grease HD2

Interflon Food Grease 1

Interflon Grease HTG

Temperature
Low temps (-45° C/ -49° F) Interflon Food Grease LT2
High temps (>150° C/ 302° F)

Interflon Grease HTG

Interflon Fluor Grease

Open Gears

DN factor Interflon product

DN < 10,000 (Extreme loads)

Interflon Grease OG

DN < 20,000 (Extreme loads)

Interflon Grease LS2

Interflon Grease LS1/2 (preferably LS2)

DN > 20,000 (Heavy to moderate loads)

Interflon Grease MP2/3

Interflon Grease HD2

Interflon Food Grease EP

Low temperatures

Interflon Food Grease LT2

To learn more about DN factor, see the Wikipedia article here.