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MATERIALS FOR FASTENERS (VẬT LIỆU BU LÔNG)

 

Class

Material

The Most Important Types

Bolts Temperature Yield Strength N/mm2

 

 

 

20OC

100OC

200OC

250OC

300OC

4.6

Carbon steel

Cq22, Cq35

240

210

190

170

140

5.6

Carbon steel

Cq22, Cq35

300

250

210

190

160

8.8

Carbon steel with additives (…Mn or Cr) quenched and tempered

Mn, B2, B4, Cq45

Cr2, Cr4

640

590

540

510

480

10.9

Carbon steel with additives (…Mn or Cr) quenched and tempered

Mn, B2, Cr4, Cq45

940

875

790

745

705

12.9

Alloyed steel quenched and tempered

Cr4, Mn,

Ni, Mo, Cq45

1100

1020

925

875

825

 

 

 

 

 

 

 

 

 

Material

C % ≤

Cu %

Si % ≤

Mn % ≤

Cr %

Mo %

Ni %

SUS304 (A2)

C, Cr, Ni, Mn, Si

0.08

2÷3

1.0

2.0

17÷19

-

8÷10.5

SUS316 (A4)

C, Cr, Ni, Mn, Si, Mo

0.08

2÷3

1.0

2.0

16÷18

2.0÷2.5

10÷14

 

 

 

 

UNIFIED THREAD  STANDARD (BƯỚC REN TIÊU CHUẨN)

 

METRIC SIZE

AMERICAN INCH SIZES

PITCH mm

METRIC ISO THREAD

TURNS PER INCH

UNF THREAD

UNC THREAD

0.80

M4, M5

24

5/16, 3/8

-

1.00

M6, M7

20

7/16, 1/2

1/4

1.25

M8, M9

18

9/16, 5/8

5/16

1.50

M10, M11

16

3/4

3/8

1.75

M12

14

7/8, 1

7/16

2.00

M14, M16

13

-

1/2

2.50

M18, M20, M22

12

1.1/8, 1.1/4

9/16

3.00

M24, M27

11

-

5/8

3.50

M30, M33

10

 

3/4

4.00

M36, M39

9

 

7/8

4.50

M42, M45

8

 

1

5.00

M48, M52

 

 

 

 

 

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