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  4. High strength stainless steel bolt BUMAXⓇ Stud bolt (Nakajima Koki Co., Ltd.)
High strength stainless steel bolt BUMAXⓇ Stud bolt-BUMAX stud bolt M5
High strength stainless steel bolt BUMAXⓇ Stud bolt-Nakajima Koki Co., Ltd.

High strength stainless steel bolt BUMAXⓇ Stud 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 standard: DIN976 ・Material: A4-SS 2343 316L HiMo ・Thread standards: ISO 261/262, JIS B0205/B0209 ・Screw accuracy: 6g ・Strength class: Class 80 ・Tensile strength: 800N/mm2 ・Proof strength: 640N/mm2 ・Shear strength: 520N/mm2 ・Elongation: 0.3d ・Using temperature range: -200℃ to 500℃ *Other model numbers are available *Items are made to order.

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    High strength stainless steel bolt BUMAXⓇ Stud bolt

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10 Models of High strength stainless steel bolt BUMAXⓇ Stud bolt

Click on the part number for more information about each product

Image Part Number Price (excluding tax) Length l (mm) Weight (mm) Nominal diameter d (mm) Pitch p (mm)
High strength stainless steel bolt BUMAXⓇ Stud bolt-Part Number-BUMAX stud bolt M5

BUMAX stud bolt M5

Available upon quote

1,000

12

M5

0.8

High strength stainless steel bolt BUMAXⓇ Stud bolt-Part Number-BUMAX stud bolt M6

BUMAX stud bolt M6

Available upon quote

1,000

18

M6

1

High strength stainless steel bolt BUMAXⓇ Stud bolt-Part Number-BUMAX stud bolt M8

BUMAX stud bolt M8

Available upon quote

1,000

32

M8

1.25

High strength stainless steel bolt BUMAXⓇ Stud bolt-Part Number-BUMAX stud bolt M10

BUMAX stud bolt M10

Available upon quote

1,000

50

M10

1.5

High strength stainless steel bolt BUMAXⓇ Stud bolt-Part Number-BUMAX stud bolt M12

BUMAX stud bolt M12

Available upon quote

1,000

73

M12

1.75

High strength stainless steel bolt BUMAXⓇ Stud bolt-Part Number-BUMAX stud bolt M14*

BUMAX stud bolt M14*

Available upon quote

1,000

99

M14

2

High strength stainless steel bolt BUMAXⓇ Stud bolt-Part Number-BUMAX stud bolt M16

BUMAX stud bolt M16

Available upon quote

1,000

133

M16

2

High strength stainless steel bolt BUMAXⓇ Stud bolt-Part Number-BUMAX stud bolt M18*

BUMAX stud bolt M18*

Available upon quote

1,000

165

M18

2.5

High strength stainless steel bolt BUMAXⓇ Stud bolt-Part Number-BUMAX stud bolt M20

BUMAX stud bolt M20

Available upon quote

1,000

208

M20

2.5

High strength stainless steel bolt BUMAXⓇ Stud bolt-Part Number-BUMAX stud bolt M24

BUMAX stud bolt M24

Available upon quote

1,000

300

M24

3

Click on the part number for more information about each product

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About Company Handling This Product

Nakajima Koki Co., Ltd.

Response Rate

100.0%

Response Time

46.8hrs

  • Japan

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