ISO 3506-1 Grade A4-50

ISO 3506-1 Grades

Mechanical properties of corrosion resistance stainless steel fasteners Grade A4-50
Grade A4-50 Bolts, Screws & Nut

A4-50 Stainless Steel Fastener is recognized by 2 ways, A2 which describe it as being from SS 316 family and 50 which classifies its strength. When we say A4-50 it generally means that the bolt / screw is from SS 316 grade and has an ultimate tensile strength as 50 kg or 500 n/mm2.

ISO 3506-1 Grade A4-50
A4-50 Hex bolts, screws, stud bolts, double ended studs, full thread rods, full threaded studs
ISO 3506-1 Grade A Series Chemical properties

Steel Group

Steel Grade

Chemical composition

mass fraction, % (maxima unless stated))

C

Si

Mn

P

S

Cr

Mo

Ni

Cu

Austenitic

A1

0.12

1

6.5

0.2

0.15 to 0.35

16 to 19

0.7

5 to 10

1.75 to 2.25

A2

0.10

1

2

0.05

0.03

15 to 20

-

8 to 19

4

A3

0.08

1

2

0.045

0.03

17 to 19

-

9 to 12

1

A4

0.08

1

2

0.045

0.03

16 to 18.5

2 to 3

10 to 15

4

A5

0.08

1

2

0.045

0.03

16 to 18.5

2 to 3

10.5 to 14

1

ISO 3506-1 Grade A Series Mechanical properties

Steel Group

Steel Grade

Property Class

TensileStrengthRma min. Mpa

Stress at 0.2 % permanent strain Rp0.2a min. Mpa

Elongation after fracture Ab min. mm

Austenitic

A1, A2

50

500

210

0.6d

A3, A4

70

700

450

0.4d

A5

80

800

600

0.3d