Stainless Steel ASTM A193 Fasteners, SS B8MLCuN Nuts, Stainless Steel ASTM A193 B8MLCuN Bolts Manufacturer, Supplier

ASTM A490 Bolts

A490 Specification classifies type 1 Grade for Structral heavy hex 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.RELIABLE PIPES & TUBES LTD. Manufactures Both Type 1 & Type 3 Grade Bolts under ASTM A490 Specification.

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Grades

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