Steel Bolts Metric Grades

Reference data and engineering information about steel bolts metric grades for material properties applications.

steelboltsmetricgrades

Overview

Engineering reference data for Steel Bolts Metric Grades in material science and properties.

Key Formulas

Stress

$\sigma = \frac{F}{A}$

Force per unit area.

Strain

$\varepsilon = \frac{\Delta L}{L_0}$

Change in length per original length.

Hooke's Law

$\sigma = E \varepsilon$

Stress proportional to strain in elastic region.

Thermal Expansion

$\Delta L = \alpha L_0 \Delta T$

Length change due to temperature.

Variables

Symbol	Description	Unit
$\sigma$	Stress	Pa
$\varepsilon$	Strain	—
$E$	Young's modulus	Pa
$\alpha$	Thermal expansion coefficient	1/°C
$\Delta T$	Temperature change	°C

Metric Steel Bolts - Grades and Property Classes

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Metric steel bolt property classes with minimum proof and tensile strengths, size ranges, and materials. Q & T denotes Quenched and Tempered.
Property Class	Head Marking	Size Range(mm)	Minimum Proof Strength(MPa)	Minimum Tensile Strength(MPa)	Material
4.6		M5 - M36	225	400	Low or medium carbon steel
4.8		M1.6 - M16	310	420	Low or medium carbon steel
5.8		M5 - M24	380	520	Low or medium carbon steel
8.8		M1.6 - M36	600	830	Medium carbon steel, Q & T
9.8		M1.6 - M16	650	900	Medium carbon steel, Q & T
10.9		M5 - M36	830	1040	Low carbon martensite steel, Q & T
12.9		M1.6 - M36	970	1220	Alloy steel, Q & T

Source: engineeringtoolbox.com

Pressure Unit Conversion

$1 \text{ Pa} = 1 \text{ N/m}^2 = 1.4504 \times 10^{-4} \text{ lb/in}^2 \text{ (psi)}$

Interactive Charts

Steel bolt - metric grade

References

Original Source

Source: engineeringtoolbox.com