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

 

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.

ASME B18.3 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.

DIN 7984 Low Head Socket Caps

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

ASME B18.3 Low Head Socket Caps

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.

DIN 7991 Flat Head Countersunk Socket Cap Screws

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

ISO 7380 Button Head Socket Cap Screws

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

ISO 7379 Socket Shoulder Screws

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

ASME B18.3 Socket Shoulder Screws

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

DIN 916 Set Screws

Property Class 45H
Hardness (HRC) 45-53

ASME B18.3 Set Screws

Property Class 45H
Hardness (HRC) 45-53

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.

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.

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.

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.

Mechanical Properties for Hex Nuts Products

ISO 898-2 Hexagon Nuts with Corase Thread

Property class 4 05 5 6 8 9 10 12
Thread
D		 Vickers hardness, HV
min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max.
M5 ≤ D ≤ M16 130 150 200 302 295c
M16 < D ≤ M39 188 302 272 353 146 302 170 302 233a 353b 188 302 272 353 272 353
Thread
D		 Brinell hardness, HB
min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max.
M5 ≤ D ≤ M16 124 143 190 287 280c
M16 < D ≤ M39 179 287 259 336 139 287 162 287 221a 336b 179 287 259 336 259 336
Thread
D		 Rockwell hardness, HRC
min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max.
M5 ≤ D ≤ M16 — 30 29c
M16 < D ≤ M39 — 30 26 36 — 30 — 30 — 36b — 30 26 36 26 36
Surface integrity shall be in accordance with ISO 6157-2.
Vickers hardness test is the reference method for acceptance (see 9.2.4).
a) Minimum value for high nuts (style 2): 180 HV (171 HB).
b) Maximum value for high nuts (style 2): 302 HV (287 HB; 30 HRC).
c) Minimum value for high nuts (style 2): 272 HV (259 HB; 26 HRC).

ISO 898-2 Hexagon Nuts with Fine Pitch Thread

Property class 4 5 5 6 8 10 12
Thread

D × P

 Vickers hardness, HV
min. max. min. max. min. max. min. max. min. max. min. max. min.
M8×1 ≤ D ≤ M16×1,5 175 188 302 250a 353b 295c 295
M16×1,5 < D ≤ M39×3 188 302 272 353 190 302 233 295 353 260 353 —
Thread

D × P

 Brinell hardness, HB
min. max. min. max. min. max. min. max. min. max. min. max. min.
M8×1 ≤ D ≤ M16×1,5 166 179 238a 336b 280c 280
M16×1,5 < D ≤ M39×3 179 287 259 336 181 287 221 287 280 336 247 336 —
Thread

D × P

 Rockwell hardness, HRC
min. max. min. max. min. max. min. max. min. max. min. max. min.
M8×1 ≤ D ≤ M16×1,5 — — 22,2a 36b 29c 29
M16×1,5 < D ≤ M39×3 — 30 26 36 — 30 — 30 29,2 36 24 36 —
Surface integrity shall be in accordance with ISO 6157-2.
The Vickers hardness test is the reference method for acceptance (see 9.2.4).
ainimMum value for high nuts (style 2): 195 HV (185 HB).
baximMum value for high nuts (style 2): 302 HV (287 HB; 30 HRC).
cinimMum value for high nuts (style 2): 250 HV (238 HB; 22,2 HRC).

DIN 267-4 Hexagon Nuts

Mechanical Properties Property class
4 5 6 8 10 12
Proof load stress Sp N/mm2 400 500 600 800 1000 1200
Vickers hardness HV5 max. 302 302 302 302 353 353
Brinell hardness HB 30 max. 290 290 290 290 335 335
Rockwell hardness HRC max. 30 30 30 30 36 36
Widening

Note: DIN 267-4 remains fundamentally unamended.
Recommended to use ISO 898-2

*All information is strictly informative