Factors Safety Fos

Reference data and engineering information about factors safety fos for miscellaneous applications.

factorssafetyfosCalculator

Overview

Engineering reference data for Factors Safety Fos in miscellaneous.

$y = x \cdot k$

Multiply by conversion factor.

$y = y_1 + \frac{(x - x_1)(y_2 - y_1)}{x_2 - x_1}$

Estimate between two known points.

$p = \frac{\text{part}}{\text{whole}} \times 100\%$

Part as fraction of whole.

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Typical Overall Factors of Safety (FOS) for Various Equipment
Equipment	Factor of Safety (FOS)
Aircraft components	1.5 - 2.5
Boilers	3.5 - 6
Bolts	8.5
Cast-iron wheels	20
Engine components	6 - 8
Heavy duty shafting	10 - 12
Lifting equipment - hooks	8 - 9
Pressure vessels	3.5 - 6
Turbine components - static	6 - 8
Turbine components - rotating	2 - 3
Spring, large heavy-duty	4.5
Structural steel work in buildings	4 - 6
Structural steel work in bridges	5 - 7
Wire ropes	8 - 9

Source: engineeringtoolbox.com

5 rows

General Recommendations for Factor of Safety Based on Material and Conditions
Application / Conditions	Factor of Safety (FOS)
Highly reliable materials; non-severe loading/environment; weight is important	1.3 - 1.5
Reliable materials; non-severe loading/environment	1.5 - 2
Ordinary materials; non-severe loading/environment	2 - 2.5
Less tried or brittle materials; non-severe loading/environment	2.5 - 3
Materials with unreliable properties; non-severe conditions, OR reliable materials under difficult conditions	3 - 4

Source: engineeringtoolbox.com

The selection of a Factor of Safety is determined after evaluating: