Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

• the most efficient way to navigate the Engineering ToolBox!

# Reduced Torque with Lubricated Bolts

When a bolt is lubricated - less torque is required to achieve bolt axial load or tension. Reduction of torques for lubricated vs. dry bolts are indicated in the table below.

Lubricated Bolts - Reduced Torque
LubricantTorque Reduction
(%)
Graphite 50 - 55
White Grease 35 - 45
SAE 30 oil 35 - 45
SAE 40 oil 30 - 40
No lube 0

### Example - Reduction of Torque when Bolt is Lubricated

The maximum tightening torque for a slightly lubricated 1" Grade 5 coarse bolt is 483 lbf ft. Dry bolt torque is approximately 30% higher - or 628 lbf ft.

Tdry = (483 lbf ft) (1 + (30%) / (100%))

= 628 lbf ft

If the bolt is lubricated with SAE 30 oil - the torque compared to a dry bolt is reduced with approximately 40%.

TSAE30 = (628 lbf ft) (1 - (40%) / (100%))

= 377 lbf ft

Note that if torque specified for a dry or slightly oiled bolt torque is applied to a lubricated bolt  - the bolt may overload and break.

## Related Topics

### • Fasteners

Bolts, nuts and threaded rods - torque, tension and loads.

### • Miscellaneous

Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more.

## Related Documents

### Bolt Stretching and Tensile Stress

Tensile stress and Hooke's Law.

### Bolt Torque Calculator

Calculate required bolt torque.

### Cast Iron Flanges - Stud Reference Chart

The number, diameter and length of studs for cast iron flanges class 125 and 250.

### Grease - Temperature Limits

Temperature limits for grease - a combination of oil and thickener.

### Improvised Torque Wrench

Improvise a torque wrench with a luggage scale.

### Industrial Lubricants - Viscosities vs. ISO-VG Grade

ISO-VG viscosity grades for industrial lubricants.

### ISO 2841 - Spark Plugs Metric Threads

Metric threads spark plugs according ISO 28741.

### ISO 724 - Metric Threads

Dimensions of metric threads according ISO 724.

### Metric Bolt Heads and Wrench Sizes

ANSI/SO, DIN and JIS bolts.

### Metric Bolts - Minimum Ultimate Tensile and Proof Loads

Minimum ultimate tensile and proof loads for metric bolts with coarse or fine threads.

### Metric Bolts - Tightening Torques

Recommended thightening torque metric bolts.

### Metric Steel Bolts - Grades and Property Classes

Metric steel bolts, screws and studs - proof and tensile strength.

### Oil Lubrication - Temperature Limits

Temperature limits for lubricating oils.

### Steel Bolts - ASTM Grades

ASTM steel bolts - proof and tensile strength.

### Steel Bolts - SAE Grades

SAE steel bolts - grades ranging grade 1 to 8.2 - proof and tensile strength.

### Threaded Bolts - Stress Area

Threaded bolts tensile stress area.

### Torque or Moment of Force - Online Converter

Torque or moment - the tendency of a force to rotate an object.

### UNC and UNF - Unified Coarce and Unified Fine Inch Threads

ANSI/ASME B1.1 Unified National Thread - UNC Coarse series and UNF Fine series.

### US Bolts - Head and Wrench Sizes

Hex Bolt, Lag Bolt, Square Bolt and Heavy Hex Bolt.

### US Bolts - Tensile Strength and Proof Loads

Tensile strength and proof loads SAE bolts.

### US Bolts - Tightening Torques

Recommended bolt torques.

### US Hex Bolts - Inches

ANSI/ASME B18.2.1 Dimensions of Hex Bolts - Imperial units.

### US Hex Bolts - Metric

ANSI/ASME B18.2.3M Dimensions of Hex Bolts - Metric units.

### US Machine Screws - Dimensions

Machine screw diameters.

### Whitworth Bolt Torques

Torque specifications Whitworth bolts.

### Wrench Spanners - Inches vs. mm

Convert between US Inches and metric mm wrench and spanner sizes.

## Search Engineering ToolBox

• the most efficient way to navigate the Engineering ToolBox!

## SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

## Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.