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General Information, Facts & Tables
[Safety Factors]

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Overview

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The tables below list the safety factors for materials and components. This list is provided as a guide, before using any of this data in a real world situation an engineer should be consulted.
  

Material Safety Factors

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Material

Steady
Load

Varying
Load

Alternating
Load

Shock
Load

Grey Cast Iron

4

6

10

15

Malleable Cast Iron

4

6

8

12

Carbon Steel

4

6

8

12

Brittle Alloys

5

6

10

15

Soft Alloys

5

6

8

12

Timber

6

10

14

20

Brick

15

20

25

30

Stone

15

20

25

30

 

Component Safety Factors

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Component

Safety Factor

Boilers

4.5 - 6

Flywheel / Armature Shafts

7 - 9

Lathe Spindles

12

Shafting

24

Steelwork (Buildings)

4

Steelwork (Bridges)

5

Steelwork (Small Scale)

6

Cast Iron Wheels

20

Welds not subject to fatigue

3 - 6

Turbine Blades / Rotors

3-5

Bolts

8.5

Gears (Static Load)

1.25

Gears (Fatigue Load)

2

Wire Rope (General Hoists)

5 - 7

Wire Rope (Guys)

3.5

Wire Rope (Mine Shafts)

5-8

Wire Rope (Lifts)

7 - 12

Springs (Small, Light Duty)

2

Springs (Small, Heavy Duty)

3

Springs (Large, Light Duty)

3

Springs (Large, Heavy Duty)

4.5