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B7 Stud Bolt

ASTM A193 Grade B7 stud bolts are high strength fasteners manufactured from a chromium-molybdenum steel and are quenched and tempered. Dimensional specifications are governed by ASME B18.31.2. Grade markings consists of both the grade symbol "B7" and the manufacturer's identification mark on one end of each stud 3/8" diameter and larger. Manufacturer's marking may be placed on other end if insufficient space. Inch series fasteners meeting ASTM A193 Grade B7 specifications are typically used in flange bolting applications. ASTM A193 covers the requirements for high temperature and high pressure bolting. A193 B7 all thread studs, as well as hex bolts having diameters above 1" are most common 8UN (8 threads per inch).

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Governing Standards
Mechanical Properties
Chemical Properties
Stud Flange Chart

Stud Flange Chart

Stud Flange ChartsASME B16.5

FLANGE		NOMINAL PIPE DIAMETER
CLASS	BOLTING	1/2	3/4	1	1-1/4	1-1/2	2	2-1/2	3	3-1/2	4
150#	Number	4	4	4	4	4	4	4	4	8	8
	Diameter	1/2	1/2	1/2	1/2	1/2	5/8	5/8	5/8	5/8	5/8
	Stud Bolt Length	2-1/4	2-1/2	2-1/2	2-3/4	2-3/4	3-1/4	3-1/2	3-1/2	3-1/2	3-1/2
	Mach Bolt Length	2	2	2-1/4	2-1/4	2-1/2	2-3/4	3	3	3	3
300#	Number	4	4	4	4	4	8	8	8	8	8
	Diameter	1/2	5/8	5/8	5/8	3/4	5/8	3/4	3/4	3/4	3/4
	Stud Bolt Length	2-1/2	3	3	3-1/4	3-1/2	3-1/2	4	4-1/4	4-1/4	4-1/2
	Mach Bolt Length	2-1/4	2-1/2	2-1/2	2-3/4	3	3	3-1/4	3-1/2	3-3/4	3-3/4
600#	Number	4	4	4	4	4	8	8	8	8	8
	Diameter	1/2	5/8	5/8	5/8	3/4	5/8	3/4	3/4	7/8	7/8
	Stud Bolt Length	3	3-1/2	3-1/2	3-3/4	4-1/4	4-1/4	4-3/4	5	5-1/2	5-3/4
900#	Number	4	4	4	4	4	8	8	8	-	8
	Diameter	3/4	3/4	7/8	7/8	1	7/8	1	7/8	-	1-1/8
	Stud Bolt Length	4-1/4	4-1/2	5	5	5-1/2	5-3/4	6-1/4	5-3/4	-	6-3/4
1500#	Number	4	4	4	4	4	8	8	8	-	8
	Diameter	3/4	3/4	7/8	7/8	1	7/8	1	1-1/8	-	1-1/4
	Stud Bolt Length	4-1/4	4-1/2	5	5	5-1/2	5-3/4	6-1/4	7	-	7-3/4
2500#	Number	4	4	4	4	4	8	8	8	-	8
	Diameter	3/4	3/4	7/8	1	1-1/8	1	1-1/8	1-1/4	-	1-1/2
	Stud Bolt Length	4-3/4	5	5-1/2	6	6-3/4	7	7-3/4	8-3/4	-	10
FLANGE		NOMINAL PIPE DIAMETER
CLASS	BOLTING	5	6	8	10	12	14	16	18	20	24
150#	Number	8	8	8	12	12	12	16	16	20	20
	Diameter	3/4	3/4	3/4	7/8	7/8	1	1	1-1/8	1-1/8	1-1/4
	Stud Bolt Length	3-3/4	4	4-1/4	4-1/2	4-3/4	5-1/4	5-1/4	5-3/4	6-1/4	6-3/4
	Mach Bolt Length	3-1/4	3-1/4	3-1/2	4	4	4-1/2	4-1/2	5	5-1/2	6
300#	Number	8	12	12	16	16	20	20	24	24	24
	Diameter	3/4	3/4	7/8	1	1-1/8	1-1/8	1-1/4	1-1/4	1-1/4	1-1/2
	Stud Bolt Length	4-3/4	4-3/4	5-1/2	6-1/4	6-3/4	7	7-1/2	7-3/4	8	9
	Mach Bolt Length	4-1/4	4-1/4	4-3/4	5-1/2	5-3/4	6-1/4	6-1/2	6-3/4	7-1/4	8
600#	Number	8	12	12	16	20	20	20	20	24	24
	Diameter	1	1	1-1/8	1-1/4	1-1/4	1-3/8	1-1/2	1-5/8	1-5/8	1-7/8
	Stud Bolt Length	6-1/2	6-3/4	7-1/2	8-1/2	8-3/4	9-1/4	10	10-3/4	11-1/4	13
900#	Number	8	12	12	16	20	20	20	20	20	20
	Diameter	1-1/4	1-1/8	1-3/8	1-3/8	1-3/8	1-1/2	1-5/8	1-7/8	2	2-1/2
	Stud Bolt Length	7-1/2	7-1/2	8-3/4	9-1/4	10	10-3/4	11-1/4	12-3/4	13-3/4	17-1/4
1500#	Number	8	12	12	12	16	16	16	16	16	16
	Diameter	1-1/2	1-3/8	1-5/8	1-7/8	2	2-1/4	2-1/2	2-3/4	3	3-1/2
	Stud Bolt Length	9-3/4	10-1/4	11-1/2	13-1/4	14-3/4	16	17-1/2	19-1/2	21-1/4	24-1/4
2500#	Number	8	8	12	12	12	-	-	-	-	-
	Diameter	1-3/4	2	2	2-1/2	2-3/4	-	-	-	-	-
	Stud Bolt Length	11-3/4	13-1/2	15	19-1/4	21-1/4	-	-	-	-	-

All dimensions are in inches.

B7 Stud Bolt

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Diameter Length 1st Thrd To 1st Thrd With Nut? Item # Availability Price Quantity UOM

5/8

2 3/4

With 2 Nuts

SB7B0620300N-I

In Stock

$1.8207/EA

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5/8-11 X 3 A193 B7 STUD BOLT WITH 2H NUTS

$1.8207/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.8207/EA
25	$1.73969/EA
80	$1.54413/EA
500	$1.19633/EA

5/8

3 1/4

With 2 Nuts

SB7B0620325N-I

In Stock

$1.98377/EA

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5/8-11 X 3 1/4 A193 B7 STUD BOLT WITH 2H NUTS

$1.98377/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.98377/EA
25	$1.89551/EA
70	$1.68242/EA
500	$1.30348/EA

5/8

3 1/2

3 1/4

With 2 Nuts

SB7B0620350N-I

In Stock

$2.07902/EA

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5/8-11 X 3 1/2 A193 B7 STUD BOLT WITH 2H NUTS

$2.07902/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.07902/EA
25	$1.98652/EA
70	$1.76321/EA
500	$1.36607/EA

5/8

3 3/4

3 1/2

With 2 Nuts

SB7B0620375N-I

In Stock

$2.05489/EA

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5/8-11 X 3 3/4 A193 B7 STUD BOLT WITH 2H NUTS

$2.05489/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.05489/EA
25	$1.96346/EA
70	$1.74274/EA
500	$1.35021/EA

5/8

3 3/4

With 2 Nuts

SB7B0620400N-I

In Stock

$2.20466/EA

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5/8-11 X 4 A193 B7 STUD BOLT WITH 2H NUTS

$2.20466/EA

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In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.20466/EA
25	$2.10656/EA
60	$1.86976/EA
500	$1.44862/EA

5/8

4 1/4

With 2 Nuts

SB7B0620425N-I

In Stock

$2.23469/EA

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5/8-11 X 4 1/4 A193 B7 STUD BOLT WITH 2H NUTS

$2.23469/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.23469/EA
25	$2.13526/EA
60	$1.89523/EA
500	$1.46836/EA

5/8

4 1/2

4 1/4

With 2 Nuts

SB7B0620450N-I

In Stock

$2.29786/EA

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5/8-11 X 4 1/2 A193 B7 STUD BOLT WITH 2H NUTS

$2.29786/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.29786/EA
25	$2.19562/EA
60	$1.9488/EA
500	$1.50986/EA

5/8

4 3/4

4 1/2

With 2 Nuts

SB7B0620475N-I

In Stock

$2.59749/EA

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5/8-11 X 4 3/4 A193 B7 STUD BOLT WITH 2H NUTS

$2.59749/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.59749/EA
25	$2.48192/EA
60	$2.20291/EA
500	$1.70674/EA

5/8

4 3/4

With 2 Nuts

SB7B0620500N-I

In Stock

$2.25005/EA

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5/8-11 X 5 A193 B7 STUD BOLT WITH 2H NUTS

$2.25005/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.25005/EA
25	$2.14993/EA
50	$1.90825/EA
500	$1.47845/EA

5/8

5 1/2

5 1/4

With 2 Nuts

SB7B0620550N-I

In Stock

$2.65565/EA

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5/8-11 X 5 1/2 A193 B7 STUD BOLT WITH 2H NUTS

$2.65565/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.65565/EA
25	$2.53749/EA
50	$2.25224/EA
500	$1.74496/EA

5/8

5 3/4

With 2 Nuts

SB7B0620600N-I

In Stock

$2.75669/EA

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5/8-11 X 6 A193 B7 STUD BOLT WITH 2H NUTS

$2.75669/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.75669/EA
25	$2.63403/EA
50	$2.33793/EA
500	$1.81135/EA

ASTM A193	Covers alloy and stainless steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
ASME B18.31.2	Covers the complete dimensional and general data for continuous thread, flange studs (stud bolts), and double-end inch-dimensioned studs.
ASME B1.1 UNC & UNF Class 2A	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Alloy Steel, Quenched & Tempered			Per ASTM A193/A193M-16
Diameter	Tempering Temperature	Tensile Strength	Yield Strength, 0.2% offset	Elongation in 4D	Reduction of Area	Hardness
Diameter	Min	ksi	Min ksi	Min %	Min %	Max
2 1/2" and under	1100F	125	105	16	50	321 HBW or 35 HRC
over 2 1/2 to 4"	1100F	115	95	16	50	321 HBW or 35 HRC
over 4 to 7"	1100F	100	75	18	50	321 HBW or 35 HRC

Per ASTM A193/A193M-16
Grade	Material	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Chromium	Molybdenum
Grade	Material	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight
B7	Alloy Steel	0.38-0.48 (1)	0.75-1.00	0.035 max	0.040 max	0.15-0.35	0.80-1.10	0.15-0.25

B7 Stud Bolt

Technical Data

Governing Standards

Governing StandardsGrade B7

Mechanical Properties

Mechanical PropertiesGrade B7

Chemical Properties

Chemical PropertiesGrade B7

Stud Flange Chart

Stud Flange ChartsASME B16.5

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Category

Length

Nut Width Flat to Flat

5/8-11 X 3 A193 B7 STUD BOLT WITH 2H NUTS

5/8-11 X 3 1/4 A193 B7 STUD BOLT WITH 2H NUTS

5/8-11 X 3 1/2 A193 B7 STUD BOLT WITH 2H NUTS

5/8-11 X 3 3/4 A193 B7 STUD BOLT WITH 2H NUTS

5/8-11 X 4 A193 B7 STUD BOLT WITH 2H NUTS

5/8-11 X 4 1/4 A193 B7 STUD BOLT WITH 2H NUTS

5/8-11 X 4 1/2 A193 B7 STUD BOLT WITH 2H NUTS

5/8-11 X 4 3/4 A193 B7 STUD BOLT WITH 2H NUTS

5/8-11 X 5 A193 B7 STUD BOLT WITH 2H NUTS

5/8-11 X 5 1/2 A193 B7 STUD BOLT WITH 2H NUTS

5/8-11 X 6 A193 B7 STUD BOLT WITH 2H NUTS