Specifications

1.Chemical composition

Grade C Si Mn P S
 JIS STKM13C 0.25max 0.35max 0.30〜0.90 0.040max 0.010max

 SKK

original

standards

SKCY510E 0.25max 0.35max 0.30〜0.90 0.040max 0.010max
SKCY540E 0.17〜0.25 0.35max 0.60〜0.90 0.040max 0.010max
SKCY590E 0.17〜0.25 0.35max 0.60〜0.90 0.040max 0.010max

2.Mechanical properties

Grade 

Tensile strength

(N/mm2)

Yield point

(N/mm2)

Elongation

(%)

JIS 

STKM13C

510min

380min

15min

SKK

original

standards

SKCY510E

510min

380min

15min

SKCY540E

540min

490min

15min

SKCY590E

590min

490min

15min

3.Tolerances for dimensions  (mm)

Inside diameter

Tolerance for 

inside

 diameter

 Wall thickness

Tolerance for

 wall thickness 

Roundness  Straightness

 〜40

+0

−0.10 

 〜7.5

 ±8%

 0.05max  0.5/1000

 41〜60

+0

−0.15 

 〜7.5

 0.08max

 61〜100

+0

−0.20

 〜9.5

 0.10max

 101〜150

+0

−0.30 

 〜12.5

 0.15max

 151〜200

+0

−0.50

 〜15.0

 0.20max

Tolerances for inside diameter of burnishing will be considered upon request.