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ASTM A490 Specification

astm-a490-BoltsASTM A490 Specification covers material for quenched & tempered Alloy Steel Bolting material for structural application.This Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength.Astm A490 is applicable to Heavy hex head Bolts only.A490 specified bolts Should not be coated by hot-dip galvanizing,any mechanical deposition, or electroplating with zinc due to the potential risk of hydrogen embrittlement

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Type 1 Medium carbon, carbon boron, or medium carbon alloy steel.
Type 3 Weathering steel.

 

Material Chemical Composition

Type 1 Bolts
Element Carbon Steel Carbon Boron Steel Alloy Steel Alloy Boron Steel
Carbon 0.30 - 0.52% 0.30 - 0.52% 0.30 - 0.52% 0.30 - 0.52%
Manganese, min 0.60% 0.60% 0.60% 0.60%
Phosphorus, max 0.040% 0.040% 0.035% 0.035%
Sulfur, max 0.050% 0.050% 0.040% 0.040%
Silicon 0.15-0.30% 0.15-0.30% 0.15-0.35% 0.15-0.35%
Boron   0.0005 - 0.003%   0.0005 - 0.003%

 

Material Chemical Composition

Type 3 Bolts, Class *
ELEMENT A B C D E F
Carbon 0.33 - 0.40% 0.38 - 0.48% 0.15 - 0.25% 0.15 - 0.25% 0.20 - 0.25% 0.20 - 0.25%
Manganese 0.90 - 1.20% 0.70 - 0.90% 0.80 - 1.35% 0.40 - 1.20% 0.60 - 1.00% 0.90 - 1.20%
Phosphorus, max 0.035% max 0.06 - 0.12% 0.035% max 0.035% max 0.035% max 0.035% max
Sulfur, max 0.040% 0.040% 0.040% 0.040% 0.040% 0.040%
Silicon 0.15 - 0.35% 0.30 - 0.50% 0.15 - 0.35% 0.25 - 0.50% 0.15 - 0.35% 0.15 - 0.35%
Copper 0.25 - 0.45% 0.20 - 0.4% 0.20 - 0.5% 0.30 - 0.50% 0.30 - 0.60% 0.20 - 0.40%
Nickel 0.25 - 0.45% 0.50 - 0.80% 0.25 - 0.50% 0.50 - 0.80% 0.30 - 0.60% 0.20 - 0.40%
Chromium 0.45 - 0.65% 0.50 - 0.75% 0.30 - 0.50% 0.50 - 1.00% 0.60 - 0.90% 0.45 - 0.65%
Vanadium   0.020% min      
Molybdenum   0.06% max   0.10% max    
Titanium     0.05% max    

 

Recommended Nuts & Washer

Nuts Washers
Plain Galvanized F436
1/4 - 1-1/2 1-5/8 - 3 1/4 - 3
A563B Hex A563A heavy hex A563DH heavy hex

 

 

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