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ASTM A449 Structural UNC 2A Black Finish Heavy Hex Bolts Fully Thread

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Shanghai Powermax Fastener Co., Ltd.

ASTM A449 Structural UNC 2A Black Finish Heavy Hex Bolts Fully Thread

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Product Details

ASTM A449 structural UNC 2A fully thread black finish heavy hex bolt

 

 

This specification covers chemical and mechanical requirements for two types of quenched and tempered steel bolts and studs, intended for use in general application with high strength requirement. ASTM A449 specification includes type 1 medium carbon steel bolts and studs manufactured in diameter 1/4 inch to 3 inch for imperial connections and from M6 to M76 for metric connections; Whereas A449 type 2 is low carbon martensite steel bolts and studs manufactured in diameter 1/4 inch to 1 inch for imperial connections and M6 to M24 for metric connections. We manufactures and supplies ASTM A449 Type 1 & Type 2 Bolts, Studs, etc with fine precision, superior integrity along with EN 10204 Type 3.1 Certification.

 

SIZE: 1/4" - 1.1//2", M6 -M36. And 600mm Max length.

STANDARD: ASME B18.2.6

THREAD: ASME B1.1 , UNC, UNF, CLASS 2A 

FINISHED: Plain, Zinc Plated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Dacromet, H.D.G.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ASTM A449 Bolt Grades

Bolt Grade

Alloy

Type 1

Medium Carbon Alloy Steel

Type 2

Low Carbon Martensite or Medium Carbon Martensite Steel

 

ASTM A449 Bolting Size Range

Bolt Grade

Inch

Type 1

1/4" to 3"

Type 2

1/4" to 1"

 

ASTM A449 Chemical Composition

Element

Type 1

Type 2

Heat Analysis, %

Product Analysis, %

Heat Analysis, %

Product Analysis, %

Carbon

0.28 - 0.55

0.25 - 0.58

0.15 - 0.38

0.13 - 0.41

Manganese, min

0.6

0.57

0.6

0.67

Phosphorus, max

0.04

0.048

0.04

0.048

Sulfur, max

0.05

0.058

0.05

0.058

Boron, min

--

--

0.0005

0.0005

 

ASTM A449 Mechanical Properties

Nominal Diameter, inch

Tensile Strength, ksi

Yield Strength, min, ksi

Elongation in 4D, min, %

Reduction in Area, min, %

1/4 to 1, incl.

120

92

14

35

Over 1 to 1-1/2, incl.

105

81

14

35

Over 1-1/2 to 3, incl.

90

58

14

35

 

ASTM A449 Hardness Requirements

Bolt Size, inch

Hardness

Brinell Hardness Number

Rockwell C

1/4 to 1, incl.

255 to 321

25 to 34

Over 1 to 1-1/2, incl.

223 to 285

19 to 30

Over 1-1/2" to 3, incl.

183 to 235

--

 

ASTM A449 Recommended Nuts

Bolt Grade

Size, Finish

Nut Grade

Style

Type 1 & Type 2

1/4" to 1-1/2", plain

ASTM A563 Grade B

Hex

Over 1-1/2" to 3", plain

ASTM A563 Grade A

Heavy Hex

1/4" to 3", zinc coated

ASTM A563 Grade DH

Heavy Hex

 

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