Steels for fasteners

For Screws & Bolts
Property classMaterial/treatmentStrengthChemical composition (%)
Nominal Tensile strength (N/mm2)C (max.)P (max.)S (max.)
4.6, 4.8Carbon steel4000.550.050.06
8.8Carbon Steel (+ Bn, Mn or Cr) quenched and tempered8000.40.0350.035
8.8Carbon Steel quenched and tempered8000.550.0350.035
10.9*Carbon Steel (+ Bn, Mn or Cr) quenched and tempered10000.350.0350.035
10.9Carbon Steel quenched and tempered10000.550.0350.035
10.9Carbon Steel (+ Bn, Mn or Cr) quenched and tempered10000.550.0350.035
10.9Alloyed steel quenched and tempered10000.550.0350.035
12.9Alloyed steel quenched and tempered12000.50.0350.035

*Products identified by underlining the property class symbol

For Standard Metric Nuts
Property classTreatmentProof Stress (N/mm2)Chemical composition
to M4M5 to M6M8 to M10M12 to M16M18 to M30C (max.Mn (min.)P (max.)S (max.)
8Quenched and tempered above M168008558708809200.580.250.060.15
10Quenched and tempered104010401040105010600.580.30.0480.058
12Quenched and tempered114011401140117012000.580.450.0480.058

Note: Due to the fact that fastening applications differ greatly, the above information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.