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BUMAXⓇ Hex bolt-BUMAX hex bolt M4
BUMAXⓇ Hex bolt-Nakajima Koki Co., Ltd.

Nakajima Koki Co., Ltd.'s Response Status

Response Rate

100.0%

Response Time

46.8hours


About This Product

BUMAX is a high-strength stainless steel bolt developed for the purpose of design improvement (downsizing and weight reduction). We use Swedish austenitic steel SUS316L material, without heat treatment, and through heading and rolling during the bolt manufacturing process, we have ensured a strength of 8.8 and 10.9, equivalent to that of steel bolts.

■High strength: 4 times the proof strength of SUS304 (A2-50) and 2 times that of SUS316 (A4-70)

Although it is made of stainless steel, BUMAX satisfies the same strength class 10.9 as steel bolts, and is four times stronger and twice as strong (yield strength ). BUMAX has been able to downsize the 20mm diameter bolt design of SUS304 (A2-50) to 10mm diameter, achieving a weight reduction of one-fourth.

■Corrosion resistance: No corrosion occurred even after 10 years of testing in marine environment.

BUMAX has obtained better results than SUS after 10 years of atmospheric exposure in coastal areas, and has proven three times more corrosion resistant than SUS316 in a 20% sulfuric acid corrosion test. Guaranteed 30 years of corrosion resistance even when used on ships exposed to the sea. We guarantee overwhelming corrosion resistance that surpasses other stainless steel bolts.

■Heat resistance: Guaranteed maximum operating temperature in the atmosphere of 600℃

SUS304/SUS316 can normally be used up to 400℃, but BUMAX can be used up to 600℃, which is 50% higher. For stainless steel bolts whose strength is increased by heat treating martensitic materials, the maximum operating temperature is set at 200℃, one-third of BUMAX. Here too, the high-strength stainless steel bolt BUMAX exhibits outstanding heat resistance compared to all stainless steel bolts.

■Specifications

・Product standards: ISO-4014/4017, JIS B1180 ・Material: A4-SS 2343 316L HiMo ・Thread standards: ISO 261/262, JIS B0205/B0209 ・Screw accuracy: 6g ・Strength class: Class 80, Class 100 ・Tensile strength: 800N/mm2, 1,000N/mm2 ・Proof strength: 640N/mm2, 900N/mm2 ・Shear strength: 520N/mm2, 650N/mm2 ・Elongation: 0.3d, 0.2d - Operating temperature range: -200℃~500℃, -200℃~600℃ *Other model numbers are available

  • Product

    BUMAXⓇ Hex bolt

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10 Models of BUMAXⓇ Hex bolt

Click on the part number for more information about each product

Image Part Number Price (excluding tax) Height k Standard dimension (mm) Height k Min. (mm) Height k Max. (mm) Body diameter ds Standard dimension Max. (mm) Body diameter ds Min. (mm) Effective cross-sectional area coarse (mm2) Flat diameter s Standard dimension Max. (mm) Flat diameter s Min. (mm) Diagonal e Min. (mm) Nominal diameter d (mm) Pitch p coarse (mm) Thread length b more than 125mm (mm) Thread length b 125mm or less (mm)
BUMAXⓇ Hex bolt-Part Number-BUMAX hex bolt M4

BUMAX hex bolt M4

Available upon quote

2.8

2,675

2/925

4

3.82

8.78

7

6.78

7.66

M4

0.7

- -
BUMAXⓇ Hex bolt-Part Number-BUMAX hex bolt M5

BUMAX hex bolt M5

Available upon quote

3.5

3.35

3.65

5

4.82

14.2

8

7.78

8.79

M5

0.8

- -
BUMAXⓇ Hex bolt-Part Number-BUMAX hex bolt M6

BUMAX hex bolt M6

Available upon quote

4

3.85

4.15

6

5.82

20

10

9.78

11.05

M6

1

Twenty four

18

BUMAXⓇ Hex bolt-Part Number-BUMAX hex bolt M8

BUMAX hex bolt M8

Available upon quote

5.3

5.15

5.45

8

7.78

36.6

13

12.73

14.38

M8

1.25

28

Twenty two

BUMAXⓇ Hex bolt-Part Number-BUMAX hex bolt M10

BUMAX hex bolt M10

Available upon quote

6.4

6.22

6.58

10

9.78

58

16

15.73

17.77

M10

1.5

32

26

BUMAXⓇ Hex bolt-Part Number-BUMAX hex bolt M12

BUMAX hex bolt M12

Available upon quote

7.5

7.32

7.68

12

11.73

84.3

18

17.73

20.03

M12

1.75

36

30

BUMAXⓇ Hex bolt-Part Number-BUMAX hex bolt M14

BUMAX hex bolt M14

Available upon quote

8.8

8.62

8.98

14

13.73

115

Twenty one

20.67

23.36

M14

2

40

34

BUMAXⓇ Hex bolt-Part Number-BUMAX hex bolt M16

BUMAX hex bolt M16

Available upon quote

10.18

9.82

10.18

16

15.73

157

Twenty four

23.67

26.75

M16

2.5

44

38

BUMAXⓇ Hex bolt-Part Number-BUMAX hex bolt M18

BUMAX hex bolt M18

Available upon quote

11.715

11.285

11.715

20

19.67

245

27

26.67

30.14

M20

2.5

48

42

BUMAXⓇ Hex bolt-Part Number-BUMAX hex bolt M20

BUMAX hex bolt M20

Available upon quote

12.715

14.785

12.715

Twenty four

23.67

353

30

29.67

33.53

M24

3

52

46

Click on the part number for more information about each product

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Response Rate

100.0%


Response Time

46.8hrs

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