Mechanical Properties of Inch Fasteners 美标紧固件对照表(2)

Mechanical Properties of Inch Fasteners

Mechanical Properties of Internally Threaded Fasteners

SpecificationASTM A563-Grade 0ASTM A563-Grade AASTM A563-Grade A

Heavy Hex

Material

Nominal Size(in.)1/4 - 1 1/2

Proof Load Stress (psi)Plain

69,000*90,000*100,000*90,000**144,000

coating (1)52,000*68,000*75,000*68,000**

Hardness RockwellMin.B55B68B68

Max.C32C32C32

Grade Identification Marking

Carbon Steel

1/4 - 1 1/21/4 - 4

ASTM A563-Grade C may be

Heavy Hexquenched and

ASTM A563-Grade DH Heavy Hex

Carbon Steel, quenched and tempered

1/4 - 4B78C38

1/4 - 4175,000150,000C24C38

Medium

Heavy HexCarbon Steel

1/4 – 1 1/2

175,000

Over 1 1/21/4 – 5/8

C24C35C35

FNL Grade 9 Thick Hex Nut

C32

180,000

C35

C38C40

Carbon Steel

3/4 – 1 1/2

ASTM A194-Grade 8

Heavy Hex

AISI 3041/4 – 1 1/280,000B60C32

Heavy Hex

AISI 3161/4 – 1 1/280,000B60C32

SAE J995 Grade Identification

GradeMaterial

5

8

Proof

Load Stress (psi)1/4 - 4

109,000**

Carbon steel

105,000*

Over 1 – 1 1/2

94,000**

1/4 – 5/8

carbon or

alloy steel, Over 5/8 – 1150,000quenched &

Over 1 – 1 1/2tempered

Nominal Size(in.)

RockwellHardnessMin.Max.

C32C32

C24C26C26

C32C34C36

Grade Identification

Marking

(1): Galvanize coating refers to nuts that have been plated with a plating or coating of sufficient thickness to require overtapping of the nut to provide assembly: for example hot-dip or mechanical galvanizing.* UNC and 8 UN ** UNF, 12 UN & finer

***When a zinc coated A194 2H nut is supplied, the zinc coating, overtapping, lubrication and rotational capacity testing shall be in accordance with ASTM A563 and the proof stress reduced accordingly. Nuts coated with zinc shall have an asterisk “*” marked after the grade symbol. Nuts coated with cadmium shall have a plus sign “+” marked after the grade symbol.

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