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Strength Specifications of Metric Threaded Fasteners

Time:2014-09-03

The following table describes the strength specifications for the different property classes of metric steel bolts, screws and studs:

Property Class Nominal Size Range (mm) Proof Strength (MPa) Yield Strength, min(MPa) Tensile Strength, min(MPa) Material
4.6 5-100 225 240 400 Low or medium carbon steel
4.8 1.6-16 310 340 420 Low or medium carbon steel; fully or partially annealed
5.8 5-24 380 420 520 Low or medium carbon steel; cold worked
8.8 Under 16 (incl.) 660 640 800 Medium carbon steel; quenched and tempered
8.8 17-72 580 660 830 Medium carbon steel; quenched and tempered
9.8 1.6-16 650 720 900 Medium carbon steel; quenched and tempered
10.9 5-100 830 940 1040 Alloy steel; quenched and tempered
12.9 1.6-100 970 1100 1220 Alloy steel; quenched and tempered

The tensile strength or ultimate tensile strength can be defined as the maximum amount of tensile stress that a component can withstand before it fractures.

The proof strength can be defined as the maximum amount of tensile stress that a component can withstand before it begins to exhibit plastic or permanent deformation on release of the stress applied.

The yield strength can be defined as the amount of tensile stress that a component can withstand when it exhibits 0.2% plastic or permanent deformation.

The property class is normally stamped on the head of the bolt. The two figures indicate the tensile and yield strengths of the bolt or screw.

In the case of a 8.8 grade bolt the first figure signifies that the Tensile Strength is at least 800MPa. The second figure signifies that the fastener will begin to yield at 80% of the Ultimate Tensile Strength, i.e. at least 640MPa.


Strength Specifications of Stainless Steel Threaded Fasteners

The following table, taken from BS EN ISO 3506, describes the strength characteristics of different grades of austenitic stainless steel bolts, screws and studs:

Steel Grade Property Class Nominal Size Range (mm) Tensile Strength, min(MPa) 0.2% Proof Stress (MPa)
A1,A2,A3,A4,A5 50 Under 39 (incl.) 500 210
70 Under 24 (incl.) 700 450
80 Under 24 (incl.) 800 600

Stainless steel fasteners do not exhibit a yield stress. In this case 0.2% proof stress is used instead, and can be defined as the tensile stress required for the component to exhibit elongation of 0.2%.

  • Studs ASTM A193 B7 / ASTM A194 2H
  • Stud bolts ASTM A193 B7—ASTM A194 2H
  • Threaded rods ASTM A193 B7
  • Socket cap fasteners Din 912
  • Din912 Socket cap fasteners
  • Din7991
  • A325/A563/F436 Heavy hex structural bolts
  • A490/A490M Heavy hex structural bolts
  • ASTM A325/325M/A490/490M
  • A325/A325M ZP Heavy hex structural bolts
  • A194 2H/2HM / A563 Heavy Hex Nuts
  • ASTM A307 Carriage Bolts
  • IFI Hex Cap Bolts
  • Din931
  • Din933
  • Din558
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