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The bolt types are available in varied grades and class options. Each grade is having its distinctive head marking and it is the primary indicator of its use. The bolts are made of different grades of steel and the grades are to determine the maximum amount of stress handles by bolts. The process of tightening bolts depends on the grade of the bolt.

Standard Parts

Appearance

Grade of Material

Marking

Nominal Size Range

Proof Load
(PSI)

Yield Strength
(Min. PSI)

Tensile Strength
(Min. PSI)

Grade 2

No Marking

1/4" - 3/4"

3/4" - 1 1/2"

55,000

33,000

57,000

36,000

74,000

60,000

Grade 5

3 Radial Lines

1/4" - 1"

1" - 1 1/2"

85,000

74,000

92,000

81,000

120,000

105,000

Grade 8

6 Radial Lines

1/4" - 1 1/2"

120,000

130,000

150,000

18-8 & 316 Stainless

No Standard Marking

   

45,000
minimum

85,000
minimum

A235 Structural Bolts

A325

85,000

74,000

 
 

92,000

81,000

120,000

105,000

Metric Parts

Appearance

Class of Material

Marking

Nominal Size Range

Proof Load
(MPA*/PSI)

Yield Strength
(MPA*/PSI)

Tensile Strength
(MPA*/PSI)

Class 8.8

8.8

<16mm

16mm -

72 mm

580 / 84,100

600 /

87,000

640 / 92,800

660 /

95,700

800 / 116,000

830 /

120,000

Class 10.9

10.9

5mm - 100mm

830 / 120,350

940 / 136,300

1040 / 150,800

Proof Load - is referred to the amount of tensile stress that a bolt withstands without any permanent deformation.

Yield Strength - is the amount of tensile stress need for a permanent deformation on a bolt.

Tensile Strength - is referred to as the maximum amount of pull apart that can take place before the break or fracturing of a bolt.


Our grade options in the standard categories –

The garde options are in following categories –