Specification

Grade

Chemistry

Rm min. kgf/mm2 N/mm2

Re min. kgf/mm2 N/mm2

Bend Test
D£50 mm

‘A’ Elongation % min
(Longitudinal) D > 40 mm

Tolerances as per division 3

C%

Mn%

Bend Angleo

Bend Diameter

t£1mm

1<t£2

2<t£3

3<t£4

On Outside diameter

On Thickness

JIS : G–
3445–1983

STKM–11A

0.12
max.

0.6 max.

30
294

180

4D

24

26

28

29

D<25 mm ± 0.12 mm

t<2 mm ± 0.15 mm

STKM–12A

35
343

18
177

90

6D

24

26

28

29

25£D<40 mm ± 0.15 mm

t>2 mm ± 8%

STKM–128

0.2 max.

0.6 max.

40
392

28
275

90

6D

14

16

18

19

40£D<50 mm ± 0.18 mm

STKM–12C

48
471

36
353

–

–

10

11

12

14

50£D<60 mm ± 0.20 mm

STKM–13A

38
373

22
216

90

6D

20

21

22

24

60£D<70 mm ± 0.23 mm

STKM–13B

0.25 max.

0.3/
0.9

45
441

31
304

90

6D

10

11

12

14

70£D<80 mm ± 0.25 mm

STKM–13C

52
510

39
382

–

–

4

6

8

9