• Fasteners for almost all your needs


  • TorqBolt provided Fastening Solutions with Desired Finish

  • Superior Washers for Better Fastening




ASTM A320 Specification

A320-boltsASTM A320 Specifications covers premium Alloy Steel bolting Solutons for use in Flanges,valves,Fittings & pressure vessels.TorqBolt Manufactures, Stocks & Supply these Bolt Fasteners in various sizes & Coatings.

For quick Quote/Information on A320 Bolts/Studs, please contact our Sales team.

Related Keywords for ASTM A320 : ASTM A320 Specification,A320 Bolts,A320 Grade L7 Bolts,A320 Grade L43 Bolts,A320 Grade B8 Bolts etc.

Grades

L7 AISI 4140/4142 Quenched and tempered
L43 AISI 4340 Quenched and tempered
B8 Class 1 AISI 304, carbide solution treated
B8 Class 2 AISI 304, carbide solution treated, strain hardened
B8M Class 1 AISI 316, carbide solution treated
B8M Class 2 AISI 316, carbide solution treated, strain hardened

 

Mechanical Properties

Grade Size Tensile ksi, min Yield, ksi, min Elong, %, min RA % min Charpy Impact
20-ft-lbf
@ temp
L7 Up to 2-1/2 125 105 16 50 -150° F
L43 Up to 4 125 105 16 50 -150° F
B8 Class 1 All 75 30 30 50 N/A
B8 Class 2 Up to 3/4 125 100 12 35 N/A
7/8 - 1 115 80 15 35 N/A
1-1/8 - 1-1/4 105 65 20 35 N/A
1-3/8 - 1-1/2 100 50 28 45 N/A
B8M Class 1 All 75 30 30 50 N/A
B8M Class 2 Up to 3/4 110 95 15 45 N/A
7/8 - 1 100 80 20 45 N/A
1-1/8 - 1-1/4 95 65 25 45 N/A
1-3/8 - 1-1/2 90 50 30 45 N/A

 

Material Chemical Composition

Element L7 (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% 0.02 - 0.30%   2.00 - 3.00%

 

Recommended Nuts & Washer

Bolt Grade Nuts Washers
L7 A194 Grade 4 or 7 F436
L43 A194 Grade 4 or 7 F436
B8 Class 1 A194 Grade 8 SS304
B8 Class 2 A194 Grade 8 SS304
B8M Class 1 A194 Grade 8M SS316
B8M Class 2 A194 Grade 8M SS316

 

Copyright © 2014 TorqBolt. All rights reserved. | Sitemap

Related Products:Bolts | Pipes | Flanges