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Mechanical properties - Steel Screws and Bolts ISO 898-1 EN 20898-1

Mechanical properties - Steel Screws and Bolts ISO 898-1 EN 20898-1

s 3.6 4.6 4.8 5.6 5.8 6.8 8.8 10.9 12.9
<= 16mm > 16mm
Tensile strength nominal value 300 400 400 500 500 600 800 800 1000 1200
Rm in MPa (N/mm2) minimum 330 400 420 500 520 600 800 830 1040 1220
Vickers hardness minimum 95 120 130 155 160 190 230 255 310 372
HV=F 98N maximum 220 220 220 220 220 250 300 336 382 434
Brinell hardness minimum 90 114 124 147 152 181 219 242 295 353
HB F=30D2 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 maximum             320 356 402 454
HV 0.3
Yield stress nominal value 180 240 320 300 400 480        
Rel in MPa(N/mm2) minimum 190 240 340 300 420 480        
0.2% elongation limit nominal value             640 640 900 1080
Rp0.2 in Mpa (N/mm2) 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 minimum 25 22 14 20 10 8 12 12 9 8
A5 in %
 
Weight Table

HRC for 8.8 bolts and nuts

Bhalla Fasteners which is the leading manufacturer, supplier and exporter of Steel Screws and Bolts according to ISO 898-1 EN 20898-1 in India.

 

IS 1367 grade 8.8 Chemical properties

Property class

Material and heat treatment

Chemical composition limit (cast analysis, %)a

Tempering temperature ⁰C

Min.

C

P

S

Bb

min.

max.

max.

max.

max.

8.8

Carbon steel with additives (e.g. Boron or Mn or Cr) quenched and tempered

0,15e

0,40

0,025

0,025

0,003

425

Carbon steel quenched and tempered

0,25

0,55

0,025

0,025

Alloy steel quenched and temperedg

0,20

0,55

0,025

0,025

 
IS 1367 grade 8.8 Mechanical properties

Mechanical or physical property

Tensile strength, Rm, MPa

Stress at 0,2 % non-proportional elongation, Rp0,2, MPa

Stress under proof load, Spf, MPa

Proof strength ratioSp,nom/ReL,min

Percentage elongation after fracture for machined test pieces, A, %

Percentage reduction of area after fracture for machined test pieces, Z, %

Height of non-decarburized thread zone, E, mm

Depth of complete decarburization in the thread, G, mm

Reduction of hardness after retempering, HV

Impact strength, KVij, J

nom.c

min.

nom.c

min.

nom.

 

min.

min.

min.

max.

max.

min.

8.8

d≤ 16 mma

800

800

640

640

580

0,91

12

52

1/2 H1

0,015

20

27

d> 16 mmb

830

640

660

600

0,91

0,016

21

27

 
IS 1367 grade 8.8 Recommended hardness

Mechanical or physical property

Vickers hardness,

HV 98 N

Brinell hardness, HBW = 30 D2

Rockwell hardness, HRC

Surface hardness, HV 0,3

min.

max.

min.

max.

min.

max.

max.

8.8

D ≤ 16 mma

250

320

245

316

22

32

-

D > 16 mmb

255

335

250

331

23

34

-