Strength Specifications For Metric Threaded Fasteners

Strength Specs For Metric Threaded Fasteners 

Property Class
(Grade)

4.6
4.8
5.8
8.8
8.8
9.8
10.9
12.9
 

Nominal Size Range (mm)

5 to 100
1.6 to 
16
5 to 24
16 & Under
17 to 72
1.6 to 16
5 to 100
1.6 to 100
 
 
 Yield Strength, min(MPa)
240
340
420
640
660
720
940
1100
 
 
  Proof Strength (MPa)
225
310
380
660
580
650
830
970
 
 Tensile Strength, min(MPa)
400
420
520
800
830
900
1040
1220
 ​
 ​​
Define : MPa - Megapascal is a metric pressure unit - 1 MPa equals 10.1972 kg/cm2

Composite Materials 

4.6 - Low or medium carbon steel​
4.8 - Low or medium carbon steel - fully or partially annealed
5.8 - Low or medium carbon steel - cold worked
8.8 - Medium carbon steel - quenched and tempered
9.8 - Medium carbon steel - quenched and tempered
10.9 - Alloy steel - quenched and tempered
12.9 - Alloy steel - quenched and tempered


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