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L7 Stud Bolt

ASTM A320 Grade L7 studs are manufactured from AISI 4140/4142 alloy steel, quenched and tempered. Dimensional specifications are governed by ASME B18.31.2. Grade markings consists of both the grade symbol "L7" 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. A320 L7 all thread studs having diameters above 1" are most common in 8UN (8 threads per inch) thread pitch. A320 L7 stud bolts are intended for low temperature service. They have the same chemical and physical properties as ASTM A193 Grade B7, but must meet a Charpy impact value of 20 lb-ft at -150F to ensure satisfactory performance in low temperature services. These fasteners are commonly used for valves, flanges, fittings, and pressure vessels.

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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.

L7 Stud Bolt

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

1/2

7 3/4

SBL70500800-I

1-3 Working Days

$4.07971/EA

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1/2-13 X 8 A320 L7 STUD BOLT

$4.07971/EA

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Quantity	Price
Quantity	Price
1	$4.07971/EA
30	$3.88796/EA
120	$3.31843/EA
510	$2.80643/EA

5/8

7 3/4

SBL70620800-I

1-3 Working Days

$6.03544/EA

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5/8-11 X 8 A320 L7 STUD BOLT

$6.03544/EA

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Quantity	Price
Quantity	Price
1	$6.03544/EA
25	$5.75178/EA
80	$4.90923/EA
500	$4.15178/EA

3/4

7 3/4

SBL70750800-I

1-3 Working Days

$6.71092/EA

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3/4-10 X 8 A320 L7 STUD BOLT

$6.71092/EA

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Quantity	Price
Quantity	Price
1	$6.71092/EA
25	$6.3955/EA
50	$5.45866/EA
500	$4.61644/EA

7/8

7 3/4

SBL70870800-I

1-3 Working Days

$11.80786/EA

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7/8-9 X 8 A320 L7 STUD BOLT

$11.80786/EA

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Quantity	Price
Quantity	Price
1	$11.80786/EA
40	$11.25289/EA
80	$9.60451/EA
160	$8.12262/EA

7 3/4

SBL71000800-I

1-3 Working Days

$11.0535/EA

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1-8 X 8 A320 L7 STUD BOLT

$11.0535/EA

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1-3 Working Days

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Quantity	Price
Quantity	Price
1	$11.0535/EA
30	$10.53398/EA
60	$8.99091/EA
130	$7.6037/EA

1 1/8

7 3/4

SBL71120800-I

1-3 Working Days

$17.77146/EA

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1 1/8-8 X 8 A320 L7 STUD BOLT

$17.77146/EA

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Quantity	Price
Quantity	Price
1	$17.77146/EA
30	$16.9362/EA
50	$14.45531/EA
100	$12.22499/EA

1 1/4

7 3/4

SBL71250800-I

1-3 Working Days

$17.84664/EA

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1 1/4-8 X 8 A320 L7 STUD BOLT

$17.84664/EA

Qty

1-3 Working Days

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Quantity	Price
Quantity	Price
1	$17.84664/EA
20	$17.00785/EA
40	$14.51646/EA
80	$12.27671/EA

1 3/8

7 3/4

SBL71370800-I

1-3 Working Days

$22.10473/EA

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1 3/8-8 X 8 A320 L7 STUD BOLT

$22.10473/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$22.10473/EA
20	$21.06581/EA
30	$17.97999/EA
70	$15.20584/EA

1 1/2

7 3/4

SBL71500800-I

1-3 Working Days

$29.0442/EA

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1 1/2-8 X 8 A320 L7 STUD BOLT

$29.0442/EA

Qty

1-3 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$29.0442/EA
20	$27.67913/EA
30	$23.62456/EA
60	$19.97951/EA

ASTM A320	Covers alloy steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for low-temperature service.
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 A320/A320M-15a
Diameter	Tempering Temperature	Tensile Strength	Yield Strength, 0.2% offset	Elongation in 4D	Reduction of Area	Hardness
Diameter	Min	Min ksi	Min ksi	Min %	Min %	Max
2 1/2" and under	1100F	125	105	16	50	321 HBW or 35 HRC

Per ASTM A320/A320M-15a
Grade	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Chromium	Molybdenum
Grade	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight
L7	0.38-0.48	0.75-1.00	0.035 max	0.040 max	0.15-0.35	0.80-1.10	0.15-0.25

L7 Stud Bolt

Technical Data

Governing Standards

Governing StandardsGrade L7

Mechanical Properties

Mechanical PropertiesGrade L7

Chemical Properties

Chemical PropertiesGrade L7

Stud Flange Chart

Stud Flange ChartsASME B16.5

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Body Diameter

Length

Thread Pitch

Thread Type

Diameter

1/2-13 X 8 A320 L7 STUD BOLT

5/8-11 X 8 A320 L7 STUD BOLT

3/4-10 X 8 A320 L7 STUD BOLT

7/8-9 X 8 A320 L7 STUD BOLT

1-8 X 8 A320 L7 STUD BOLT

1 1/8-8 X 8 A320 L7 STUD BOLT

1 1/4-8 X 8 A320 L7 STUD BOLT

1 3/8-8 X 8 A320 L7 STUD BOLT

1 1/2-8 X 8 A320 L7 STUD BOLT