Metric bolt grades and strength calculator to show proof strength, tensile strength,
Vickers / Brinell hardness,
minimum breaking torque and stress area of metric bolts and screws made of carbon steel and alloy
steel with designations 4.6, 4.8, 5.8, 8.8, 9.8, 10.9 and 12.9.
- Standard specifies the mechanical properties of bolts, screws and studs made of carbon steel and alloy
steel when tested at an ambient temperature range of 10 °C to 35 °C. Fasteners conforming to the requirements of ISO 898 are used in applications ranging from −50 °C
to +150 °C.
- ISO 898 applies to bolts, screws and studs with coarse pitch thread M1.6 to M39 and fine pitch thread M8 X 1 to M39 X 3 with triangular ISO thread
- The minimum breaking torques are not valid for hexagon socket set screws.
Metric Bolt Grades and Strength Calculator:
RESULTS |
Parameter |
Value |
Designation |
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|
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Property Class |
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|
Screw Thread Series |
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|
Nominal Stress Area [As_nom] |
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|
mm2 |
Minimum Tensile Strength [Rm_min] |
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|
MPa |
Minimum Ultimate Tensile Load |
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|
N |
Minimum Stress at 0,2 % non-proportional elongation [Rp0.2_min] |
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|
MPa |
Stress Under Proof Load [Sp] |
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|
Proof Load |
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|
N |
Minimum Breaking Torque [MB_min] |
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|
N.m |
Vickers Hardness , F ≥ 98 N
|
Min. |
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|
HV |
Max. |
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|
Minimum Brinell Hardness , F = 30 D2 |
Min. |
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|
HBW |
Max. |
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Note: Breaking torque test applies to bolts and screws with thread less than M3
for which no breaking and proof loads are indicated in ISO 898-1, as well as to
short bolts and screws with nominal diameters 3 mm to 10 mm which cannot be
subjected to a tensile test. Minimum breaking torques are valid for bolts and
screws with the thread tolerances 6g, 6f and 6e.