ASTM A320 Grados L7 Y L7m Stud Bolt

• Material: High Strength Steel
• Type: Round Head
• Connection: Common Bolt
• Head Style: Round
• Standard: ANSI
• Grade: ASTM A320 L7
• Model NO.: ASTM A-320 Grados L7 y L7M
• Application: Chemical Industry
• Finish: Hot Galvanizing
• Steel Grade: ASTM A320 L7
• Transport Package: Playwood Box, Wooden Case
• Specification: ESPARRAGOS ASTM A320 L7 / L7M
• Trademark: C&N
• Origin: China
• Production Capacity: 100tons/Month

Product Description

We offer high quality ASTM A320 L7 Bolts from 3/8" to 2" Diameter in multiple lengths and either standard thread length or custom thread length


A320 Grades


L7 Alloy steelL43 Alloy steelB8 Class 1 Stainless steelB8M Class 1 Stainless steelB8 Class 2 Stainless steelB8M Class 2 Stainless steel

AISI 4140/4142 Quenched and tempered

AISI 4340 Quenched and tempered

AISI 304, carbide solution treated

AISI 316, carbide solution treated

AISI 304, carbide solution treated, strain hardened

AISI 316, carbide solution treated, strain hardened

A320 Mechanical Properties


GradeDiameterTensile, ksi, minYield, ksi, minCharpy Impact 20-ft-lbf @ tempElong, %, minRA, %, min

L7	Up to 21?2	125	105	-150° F	16	50
L43	Up to 4	125	105	-150° F	16	50
B8 Class 1	All	75	30	N/A	30	50
B8M Class 1	All	75	30	N/A	30	50
B8 Class 2	Up to 3?4	125	100	N/A	12	35
	7?8 - 1	115	80	N/A	15	35
	11?8 - 11?4	105	65	N/A	20	35
	13?8 - 11?2	100	50	N/A	28	45
B8M Class 2	Up to 3?4	110	95	N/A	15	45
	7?8 - 1	100	80	N/A	20	45
	11?8 - 11?4	95	65	N/A	25	45
	13?8 - 11?2	90	50	N/A	30	45

A320 Chemical Properties


ElementL7 (AISI 4140)L43 (AISI 4340)B8 (AISI 304)B8M (AISI 316)

Carbon	0.37 - 0.49%	0.38 - 0.43%	0.08% max	0.08% max
Manganese	0.65 - 1.10%	0.75 - 1.00%	2.00% max	2.00% max
Phosphorus, max	0.035%	0.035%	0.045%	0.045%
Sulfur, max	0.040%	0.040%	0.030%	0.030%
Silicon	0.15 - 0.35%	0.15 - 0.35%	1.00% max	1.00% max
Chromium	0.75 - 1.20%	0.70 - 0.90%	18.0 - 20.0%	16.0 - 18.0%
Nickel		1.65 - 2.00%	8.0 - 11.0%	10.0 - 14.0%
Molybdenum	0.15 - 0.25%	0.20 - 0.30%		2.00 - 3.00%