Technical

Technical Specification for Fasteners

Description Download
ASME B18-2-2 Download button
ASME B18-2-3 Download button
ASME B1-13M Download button
ASTM A325M Download button
ASTM AF436 Download button
ASTM A193 Download button
ASTM A153 Download button
ASME B18-2-1 Download button
ASME B18-2-6 & ASME B18-2-7 Download button
ASTM F568 Download button
ASTM A307 Download button
Nut Bolt Standard Download button
ASME B1.1 Download button
ASME B18-2-4-6 Download button
IS 1367.3 Download button
IS 1367.6 Download button
IS 1367.8 Download button
IS 2016.1967 Download button
IS 14962.4 Download button
ISO Metric Fasteners Download button

Heat Treated Alloy Studs, Bolts, and Threaded Bars

Chemical Composition

Elements

A354 Grades BC, BD

A193 Grade B7

**See Note Below

Chromium-Molybdenum

Range percent

Check variation
over percent

Range percent

Check variation
over or under percent

Carbon

*0.38-0.48

0.02

Manganese

0.750-1.00

0.04

Phosphorus, max

0.04

0.005

0.04

0.005 over

Sulphur, max

0.04

0.005

0.04

0.005 over

Silicon

0.20-0.35

0.02

Chromium

0.80-1.10

0.05

Molybdenum

0.15-0.25

0.02

Elements

A193 Grade B16
Chromium-Molybdenum-Vanadium

Range percent

Check variationover or under percent

Carbon

0.36-0.44

0.02

Manganese

0.45-0.70

0.03

Phosphorus, max

0.04

0.005 over

Sulphur, max

0.04

0.005 over

Silicon

0.20-0.35

0.02

Chromium

0.80-1.15

0.05

Molybdenum

0.50-0.65

0.03

Vanadium

0.25-0.35

0.03

Elements

A320 Grade L7

A320 Grade L43

Chromium-Molybdenum
(AISI 4140, 4142, 4145)

Nickel-Chromium-Molybdenum
(AISI 4340)

Range percent

Check variation
over percent

Range percent

Check variation
over or under percent

Carbon

*0.38-0.48

0.02

0.38-0.148

0.02

Manganese

0.75-1.00

0.04

0.60-0.85

0.03

Phosphorus, max

0.04

0.005 over

0.04

0.005 over

Sulphur, max

0.04

0.005 over

0.04

0.005 over

Silicon

0.20-0.35

0.02

0.20-0.35

0.02

Nickel

1.65-2.00

0.05

Chromium

0.80-1.10

0.05

0.70-1.90

0.03

Molybdenum

0.15-0.25

0.02

0.20-0.30

0.02

*For bar sizes over 3-1/2 in. to 4 in., inclusive, the carbon content may be 0.50 pct. max.
** Any alloy steel capable of meeting the tensile requirements of Specification A354 may be used.

Mechanical Composition

Grade

Diameter,
in.

Min
tempering
temp F

Tensile
strength
min psi

Yield
point
min psi

Elongation
in 2 in.
min pct

Reduction
of area
min pct

A354 Grade BC

{2-1/2 and under
{Over 2-1/2 to 4 incl.

850

125,000

109,000

16

50

A354 Grade BD

1-1/2 and under

850

115,000

99,000

16

45

A193 Grade B7
Chromium-
Molybdenum

{2-1/2 and under
{Over 2-1/2 to 4 incl.
{Over 4 to 7 incl.

850

150,000

125,000

14

35

A193 Grade B16
Chromium-
Molybdenum-
Vanadium

{2-1/2 and under
{Over 2-1/2 to 4 incl.
{Over 4 to 7 incl.

1100
1100
1100

125,000
115,000
100,000

105,000
95,000
75,000

16
16
18

50
50
50

A320 Grade L7
Chromium-
Molybdenum

2-1/2 and under

125,000

105,000

16

50

A320 Grade L43
Nickel-Chromium-
Molybdenum

4 and under

125,000

105,000

16

50

Commonly used are the following grades of heat-treated alloy steel for high-pressure or extreme temperature service in diameters of 1/2 in. to 2 in., inclusive. Other grades and other diameters are available on special order.
ASTM A354, Grades BC and BD – heat-treated alloy steels for applications at normal atmospheric temperatures where high strength is required.
ASTM A193, Grade B7 – a - heat-treated chromium-molybdenum steel widely used for medium high-temperature service.
ASTM A193, Grade B16 – a - heat-treated chromium-molybdenum-vanadium steel for high-pressure, high-temperature service.
ASTM A320, Grade L7 – This grade is intended for low-temperature service down to minus 150ºF and has a minimum Charpy impact value of 15 ft-lb at this temperature. Sizes 2-1/2 in. and under.
ASTM A320, Grade L43 – The same properties offered by Grade L7 in sizes up to 2-1/2 are obtainable up to 4 in. in Grade L43.