General Mechanical Properties

Property 3.6 4.6 4.8 5.6 5.8 6.8 8.8 10.9 12.9
<= 16mm > 16mm

Tensile Strength
Rm in MPa (N/mm2)

nominal value 300 400 400 500 500 600 800 800 1000 1200
minimum 330 400 420 500 520 600 800 830 1040 1220
Vickers Hardness
HV=F 98N
minimum 95 120 130 155 160 190 230 255 310 372
maximum 220 220 220 220 220 250 300 336 382 434
Brinell Hardness
HB F=30D2
minimum 90 114 124 147 152 181 219 242 295 353
maximum     209     238 285 319 363 412
Rockwell Hardness HR minimum HRB 52 67 71 79 82 89        
minimum HRC             20 23 31 38
maximum HRB 95 95 95 95 95          
maximum HRC             30 34 39 44
Surface Hardness
HV 0.3
maximum             320 356 402 454
Yield Stress
Rel in MPa(N/mm2)
nominal value 180 240 320 300 400 480        
minimum 190 240 340 300 420 480        
0.2% elongation limit
Rp0.2 in Mpa (N/mm2)
nominal value             640 640 900 1080
minimum             640 660 940 1100
Test stress Sp Sp/ReL or Rp0.2 0.94 0.94 0.91 0.94 0.91 0.91 0.91 0.91 0.88 0.88
MPA (N/mm2) 180 225 310 280 380 440 580 600 830 970
Elongation after fracture
A5 in %
minimum 25 22 14 20 10 8 12 12 9 8
Minimum notch impact energy in Joules       25     30 30 20 15
Head Impact Toughness No Fracture
Maximum Height of the Thread Zone Not Decarburized E             1/2H1 1/2H1 2/3H1 3/4H1
Maximum Depth of Decarburization Gmm             .015 .015 .015 .015

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Mechanical Properties for Socket Products

DIN 912 Socket Cap Screws

Property Class 12.9
Hardness (HRC) 39-44
Tensile Strength (Mpa) 1,220 min.
Yield Strength at 0.2% Offset (Mpa) 1,100 min.
Elongation (%) 8 min.

DIN 7984 Low Head Socket Caps

Property Class 10.9
Hardness (HRC) 32-39
Tensile Strength (Mpa) 832 min.

DIN 7991 Flat Head Countersunk Socket Cap Screws

Property Class 10.9
Hardness (HRC) 32-39
Tensile Strength (Mpa) 835 min.

ISO 7380 Button Head Socket Cap Screws

Property Class 10.9
Hardness (HRC) 32-39
Tensile Strength (Mpa) 835 min.

ISO 7379 Socket Shoulder Screws

Property Class 12.9
Hardness (HRC) 39-44
Tensile Strength (Mpa) 1,100 min.

DIN 916 Set Screws

Property Class 45H
Hardness (HRC) 45-53

ASME B18.3 Socket Cap Screws

Diameter d d <= 1/2 d > 1/2
Hardness (HRC) 39-45 37-45
Tensile Strength (psi) 180,000 min. 170,000 min.
Yield Strength at 0.2% Offset (psi) 153,000 min. 153,000 min.
Elongation (%) 10 min. 10 min.

ASME B18.3 Low Head Socket Caps

Diameter d d <= 1/2 d > 1/2
Hardness (HRC) 39-44 37-44
Tensile Strength (psi) 145,000 min. 135,000 min.

ASME B18.3 Flat Head Countersunk Socket Cap Screws

Diameter d d <= 1/2 d > 1/2
Hardness (HRC) 39-44 37-44
Tensile Strength (psi) 145,000 min. 135,000 min.

ASME B18.3 Button Head Socket Cap Screws

Diameter d d <= 1/2 d > 1/2
Hardness (HRC) 39-44 37-44
Tensile Strength (psi) 145,000 min. 135,000 min.

ASME B18.3 Socket Shoulder Screws

Hardness (HRC) 39-43
Tensile Strength (psi) 140,000 min.

ASME B18.3 Set Screws

Property Class 45H
Hardness (HRC) 45-53

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Mechanical Properties for Hex Products

ISO 4014 / 4017 Hex Head Bolts

Property Class 10.9 12.9
Hardness (HRC) 32-39 39-44
Tensile Strength (Mpa) 1,040 min. 1,220 min.
Yield Strength at 0.2% Offset (Mpa) 940 min. 1,100 min.
Elongation (%) 9 min. 8 min.

ISO 4162 Hexagon Flange Bolts

Property Class 10.9 12.9
Hardness (HRC) 32-39 39-44
Tensile Strength (Mpa) 1,040 min. 1,220 min.
Yield Strength at 0.2% Offset (Mpa) 940 min. 1,100 min.
Elongation (%) 9 min. 8 min.

ASME B18.2.1 Hexagon Head Cap Screws

Property Class SAE J429-Grade 8
Hardness (HRC) 33-39
Surface Hardness (30N) 58.6 max.
Tensile Strength (psi) 150,000 min.
Yield Strength at 0.2% Offset (psi) 130,000 min.
Elongation (%) 12 min.

IFI-111 Hexagon Flange Screws

Property Class SAE J429-Grade 8
Hardness (HRC) 33-39
Surface Hardness (30N) 58.6 max.
Tensile Strength (psi) 150,000 min.
Yield Strength at 0.2% Offset (psi) 130,000 min.
Elongation (%) 12 min.

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*All information is strictly informative