Material Properties - Steel Screws and Bolts - ISO 898 pt 1 EN 20898 pt 1

Property class Material/treatment Chemical composition (%)
C (max.) P (max.) S (max.)
4.6, 4.8 Carbon steel 0.55 0.05 0.06
8.8 Carbon Steel (+ Bn, Mn or Cr) quenched and tempered 0.4 0.035 0.035
8.8 Carbon Steel quenched and tempered 0.55 0.035 0.035
10.9* Carbon Steel (+ Bn, Mn or Cr) quenched and tempered 0.35 0.035 0.035
10.9 Carbon Steel quenched and tempered 0.55 0.035 0.035
10.9 Carbon Steel (+ Bn, Mn or Cr) quenched and tempered 0.55 0.035 0.035
10.9 Alloyed steel quenched and tempered 0.55 0.035 0.035
12.9 Alloyed steel quenched and tempered 0.5 0.035 0.035


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.