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    Scope

    ASTM A193 is the standard specification for alloy-steel and stainless steel bolts used in high-temperature or high-pressure environments or other special-purpose applications.  ASTM A194 is the standard specification for carbon and alloy steel nuts for bolts used in equivalent high-pressure or high-temperature environments. ASTM A193 and A194 bolts and nuts from Glaser and Associates are available in a range of grades, including B7, B16 B8 and B8M to meet different design, service conditions, mechanical properties, and high temperature requirements. ASTM A194 also covers the American Association State Highway and Transportation Officials Standard AASHTO M-292.

    These bolts and nuts are designed, manufactured and tested to comply with the standards set by ASTM A193 and A194 for chemical composition, tensile and hardness properties and high temperature characteristics.

    Grades

    Grade

    Material

    B7

    Alloy steel, AISI 4140/4142 quenched and tempered

    B16

    Alloy steel, Chromium-molybdenum-vanadium heat treated

    B8

    Class 1 Stainless steel, AISI 304, carbide solution treated

    B8M

    Class 1 Stainless steel, AISI 316, carbide solution treated

    B8

    Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened

    B8M

    Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened

    B7, B8 and B8M are the most commonly used grades. The properties tables below provide more information on the differences between the grades.

    Applications

    The high-temperature, high-pressure performance of these bolts and nuts make them suitable for applications in process industries, such as petroleum and chemicals where they are widely used in pressure vessels, valves, flanges, and fittings.

    Properties

    Grade

    Size

    Tensile ksi, min

    Yield, ksi, min

    Elong, %, min

    RA % min

    B7

    Up to 2-1/2

    125

    105

    16

    50

    2-5/8 - 4

    115

    95

    16

    50

    4-1/8 - 7

    100

    75

    18

    50

     

    Up to 2-1/2

    125

    105

    18

    50

    B16

    2-5/8 - 4

    110

    95

    17

    45

     

    4-1/8 - 7

    100

    85

    16

    45

    B8 Class 1

    All

    75

    30

    30

    50

    B8M Class 1

    All

    75

    30

    30

    50

    B8 Class 2

    Up to 3/4

    125

    100

    12

    35

    7/8 - 1

    115

    80

    15

    35

    1-1/8 - 1-1/4

    105

    65

    20

    35

    1-3/8 - 1-1/2

    100

    50

    28

    45

    B8M Class 2

    Up to 3/4

    110

    95

    15

    45

    7/8 - 1

    100

    80

    20

    45

    1-1/8 - 1-1/4

    95

    65

    25

    45

    1-3/8 - 1-1/2

    90

    50

    30

    45

     

    Element

    B7

    B8

    B8M

    Carbon

    0.37 - 0.49%

    0.08% max

    0.08% max

    Manganese

    0.65 - 1.10%

    2.00% max

    2.00% max

    Phosphorus, max

    0.035%

    0.045%

    0.045%

    Sulfur, max

    0.040%

    0.030%

    0.030%

    Silicon

    0.15 - 0.35%

    1.00% max

    1.00% max

    Chromium

    0.75 - 1.20%

    18.0 - 20.0%

    16.0 - 18.0%

    Nickel

    8.0 - 11.0%

    10.0 - 14.0%

    Molybdenum

    0.15 - 0.25%

    2.00 - 3.00%

     

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